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2月每日DONE。

2.8

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 typedef long long LL;
 6 
 7 // template
 8 struct Point
 9 {
10     LL x, y;
11     Point(LL x = 0, LL y = 0): x(x), y(y){}
12 };
13 typedef Point Vector;
14 Vector operator - (Vector A, Vector B){return Vector(A.x - B.x, A.y - B.y);}
15 Vector operator + (Vector A, Vector B){return Vector(A.x + B.x, A.y + B.y);}
16 bool operator < (const Point& a, const Point& b){return a.x < b.x || (a.x == b.x && a.y < b.y);}
17 LL Cross(Vector A, Vector B){return A.x * B.y - A.y * B.x;}
18 
19 LL PolygonArea(Point* P, int n)
20 {
21     LL ans = 0;
22     for(int i = 1; i < n - 1; i++) ans += Cross(P[i] - P[0], P[i+1] - P[0]);
23     return ans;
24 }
25 
26 int ConvexHull(Point* p, int n, Point* ch)
27 {
28     sort(p, p + n);
29     int m = 0;
30     for(int i = 0; i < n; i++)
31     {
32         while(m > 1 && Cross(ch[m-1] - ch[m-2], p[i] - ch[m-2]) <= 0) m--;
33         ch[m++] = p[i];
34     }
35     int k = m;
36     for(int i = n - 2; i >= 0; i--)
37     {
38         while(m > k && Cross(ch[m-1] - ch[m-2], p[i] - ch[m-2]) <= 0) m--;
39         ch[m++] = p[i];
40     }
41     if(n > 1) m--;
42     return m;
43 }
44 
45 Point p[5555], ch[5555];
46 bool judge(int i, int j, int pos, int cnt)
47 {
48     p[0] = ch[i], p[1] = ch[j];
49     p[2] = ch[pos];
50     LL s1 = PolygonArea(p, 3);
51     p[2] = ch[(pos+1)%cnt];
52     LL s2 = PolygonArea(p, 3);
53     return s2 > s1;
54 }
55 
56 int main(void)
57 {
58     int n;
59     LL S;
60     scanf("%d %I64d", &n, &S);
61     for(int i = 0; i < n; i++)
62     {
63         int a, b;
64         scanf("%d %d", &a, &b);
65         p[i].x = (LL) a, p[i].y = (LL) b;
66     }
67     int cnt = ConvexHull(p, n, ch);
68     int a, b, c, pos;
69     LL s = 0;
70     for(int i = 0; i < cnt; i++)
71     {
72         pos = (i + 2) % cnt;
73         for(int j = (i + 1) % cnt; (j + 1) % cnt != i; j = (j + 1) % cnt)
74         {
75             if(pos == j) pos = (pos + 1) % cnt;
76             while((pos + 1) % cnt != i && judge(i, j, pos, cnt)) pos = (pos + 1) % cnt;
77             p[0] = ch[i], p[1] = ch[j], p[2] = ch[pos];
78             LL tmp = PolygonArea(p, 3);
79             if(tmp > s) s = tmp, a = i, b = j, c = pos;
80         }
81     }
82     Point x = ch[a] + ch[b] - ch[c], y = ch[c] + ch[a] - ch[b], z = ch[b] + ch[c] - ch[a];
83     printf("%I64d %I64d
", x.x, x.y);
84     printf("%I64d %I64d
", y.x, y.y);
85     printf("%I64d %I64d
", z.x, z.y);
86     return 0;
87 }

Aguin

2.9

CodeForces - 575A

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <cstring>
  4 #include <algorithm>
  5 using namespace std;
  6 typedef long long LL;
  7 typedef pair<LL, LL> pii;
  8 const int maxn = 5e4 + 10;
  9 LL K, mod, s[maxn];
 10 pii pr[maxn];
 11 int N, MM;
 12 
 13 // Matrix
 14 struct Matrix
 15 {
 16     LL m[2][2];
 17     Matrix(){memset(m, 0, sizeof(m));}
 18     void E(){memset(m, 0, sizeof(m)); for(int i = 0; i < 2; i++) m[i][i] = 1;}
 19 };
 20 Matrix M_mul(Matrix a, Matrix b)
 21 {
 22     Matrix ret;
 23     for(int i = 0; i < 2; i++)
 24         for(int j = 0; j < 2; j++)
 25             for(int k = 0; k < 2; k++)
 26                 ret.m[i][j] = ( ret.m[i][j] + (a.m[i][k] * b.m[k][j]) % mod ) % mod;
 27     return ret;
 28 }
 29 Matrix M_qpow(Matrix P, LL n)
 30 {
 31     Matrix ret;
 32     ret.E();
 33     while(n)
 34     {
 35         if(n & 1LL) ret = M_mul(ret, P);
 36         n >>= 1LL;
 37         P = M_mul(P, P);
 38     }
 39     return ret;
 40 }
 41 
 42 // seg
 43 Matrix a[maxn], mul[maxn<<2];
 44 void gather(int p)
 45 {
 46     mul[p] = M_mul(mul[p<<1|1], mul[p<<1]);
 47 }
 48 void build(int p, int l, int r)
 49 {
 50     if(l < r)
 51     {
 52         int mid = (l + r) >> 1;
 53         build(p<<1, l, mid);
 54         build(p<<1|1, mid + 1, r);
 55         gather(p);
 56     }
 57     else mul[p] = a[l];
 58 }
 59 Matrix query(int p, int tl, int tr, int l, int r)
 60 {
 61     Matrix ret; ret.E();
 62     if(tr < l || r < tl) return ret;
 63     if(l <= tl && tr <= r) return mul[p];
 64     int mid = (tl + tr) >> 1;
 65     ret = query(p<<1, tl, mid, l, r);
 66     ret = M_mul(query(p<<1|1, mid+1, tr, l, r), ret);
 67     return ret;
 68 }
 69 
 70 Matrix query(LL l, LL r)
 71 {
 72     LL len = r - l + 1;
 73     int pl = (l - 1) % N + 1, pr = (r - 1) % N + 1;
 74     if(pl <= pr && len <= N) return query(1, 1, N, pl, pr);
 75     len -= N - pl + 1 + pr;
 76     LL rd = len / N;
 77     Matrix ret = M_mul(M_mul(query(1, 1, N, 1, pr), M_qpow(query(1, 1, N, 1, N), rd)), query(1, 1, N, pl, N));
 78     return ret;
 79 }
 80 
 81 int main(void)
 82 {
 83     scanf("%I64d %I64d", &K, &mod);
 84     scanf("%d", &N);
 85     for(int i = 0; i < N; i++) scanf("%I64d", s + i);
 86     scanf("%d", &MM);
 87     for(int i = 1; i <= MM; i++) scanf("%I64d %I64d", &pr[i].first, &pr[i].second);
 88     if(!K) return puts("0");
 89     sort(pr + 1, pr + 1 + MM);
 90     s[N] = s[0];
 91     for(int i = 1; i <= N; i++) a[i].m[0][0] = s[i], a[i].m[0][1] = s[i-1],
 92                                 a[i].m[1][0] = 1, a[i].m[1][1] = 0;
 93     build(1, 1, N);
 94     Matrix M, P;
 95     M.E();
 96     P.m[1][0] = 1, P.m[1][1] = 0;
 97     LL st = 1;
 98     for(int i = 1; i <= MM; i++)
 99     {
100         LL p = pr[i].first, v = pr[i].second;
101         if(i > 1)
102         {
103             if(pr[i-1].first == p - 1)
104             {
105                 P.m[0][0] = v, P.m[0][1] = pr[i-1].second;
106                 M = M_mul(P, M);
107                 st++;
108                 if(st > K) break;
109                 continue;
110             }
111             P.m[0][0] = s[st%N], P.m[0][1] = pr[i-1].second;
112             M = M_mul(P, M);
113             st++;
114             if(st > K) break;
115         }
116         if(p > K) {M = M_mul(query(st, K), M); st = K + 1; break;}
117         if(st < p) M = M_mul(query(st, p - 1), M), st = p;
118         P.m[0][0] = v, P.m[0][1] = s[(p-1)%N];
119         M = M_mul(P, M);
120         st++;
121         if(st > K) break;
122     }
123     if(st <= K)
124     {
125         P.m[0][0] = s[st%N], P.m[0][1] = pr[MM].second;
126         M = M_mul(P, M);
127         st++;
128         if(st <= K) M = M_mul(query(st, K), M);
129     }
130     printf("%I64d
", M.m[1][0]);
131     return 0;
132 }

Aguin

AtCoder - 2303

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int maxn = 1e5 + 10;
 5 typedef long long LL;
 6 LL a[maxn], b[maxn];
 7  
 8 int main(void)
 9 {
10     LL N;
11     scanf("%lld", &N);
12     LL sum = 0;
13     for(int i = 1; i <= N; i++) scanf("%lld", a + i), sum = sum + a[i];
14     LL div = (1 + N) * (LL) N / 2;
15     if(sum % div) {puts("NO"); return 0;}
16     LL rd = sum / div;
17     for(int i = 1; i < N; i++) b[i] = a[i+1] - a[i];
18     b[N] = a[1] - a[N];
19     LL ok = 1, cnt = 0;
20     for(int i = 1; i <= N; i++)
21     {
22         b[i] -= rd;
23         if(b[i] > 0 || b[i] % N) {ok = 0; break;}
24         cnt -= b[i] / N;
25     }
26     if(cnt != rd) ok = 0;
27     puts(ok ? "YES" : "NO");
28     return 0;
29 }

Aguin

AtCoder - 2304

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const int maxn = 1e5 + 10;
 6 LL v[maxn];
 7  
 8 // edge
 9 int cnt, h[maxn];
10 struct edge
11 {
12     int to, pre;
13 } e[maxn<<1];
14 void add(int from, int to)
15 {
16     cnt++;
17     e[cnt].pre = h[from];
18     e[cnt].to = to;
19     h[from] = cnt;
20 }
21  
22 int deg[maxn], ok;
23 LL dfs(int x, int f)
24 {
25     if(deg[x] == 1) return v[x];
26     LL ret = v[x] + v[x];
27     for(int i = h[x]; i; i = e[i].pre)
28     {
29         int to = e[i].to;
30         if(to == f) continue;
31         LL tmp = dfs(to, x);
32         if(tmp > v[x]) ok = 0;
33         if(tmp > ret) ok = 0;
34         ret -= tmp;
35     }
36     if(ret > v[x]) ok = 0;
37     return ret;
38 }
39  
40 int main(void)
41 {
42     int N;
43     scanf("%d", &N);
44     for(int i = 1; i <= N; i++) scanf("%lld", v + i);
45     for(int i = 1; i < N; i++)
46     {
47         int a, b;
48         scanf("%d %d", &a, &b);
49         add(a, b); add(b, a);
50         deg[a]++; deg[b]++;
51     }
52     if(N == 2)
53     {
54         if(v[1] == v[2]) puts("YES");
55         else puts("NO");
56         return 0;
57     }
58     int rt = 0;
59     for(int i = 1; i <= N; i++)
60     if(deg[i] != 1) {rt = i; break;}
61     ok = 1;
62     if(dfs(rt, 0)) ok = 0;
63     puts(ok ? "YES" : "NO");
64     return 0;
65 }

Aguin

2.10

AtCoder - 2307

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 typedef pair<int, int> pii;
 6 int a[3333], sg[3333];
 7 
 8 // edge
 9 int cnt, h[3333];
10 struct edge
11 {
12     int to, pre;
13 } e[3333];
14 void add(int from, int to)
15 {
16     cnt++;
17     e[cnt].pre = h[from];
18     e[cnt].to = to;
19     h[from] = cnt;
20 }
21 
22 pii pr[3333];
23 int main(void)
24 {
25     int N;
26     scanf("%d", &N);
27     for(int i = 1; i <= N; i++) scanf("%d", a + i), pr[i] = pii(a[i], i);
28     for(int i = 1; i < N; i++)
29     {
30         int u, v;
31         scanf("%d %d", &u, &v);
32         if(a[u] > a[v]) add(v, u);
33         if(a[v] > a[u]) add(u, v);
34     }
35     sort(pr + 1, pr + 1 + N);
36     for(int i = 1; i <= N; i++)
37     {
38         int x = pr[i].second;
39         if(!sg[x])
40         for(int j = h[x]; j; j = e[j].pre) sg[e[j].to] = 1;
41     }
42     for(int i = 1; i <= N; i++) if(sg[i]) printf("%d ", i);
43     puts("");
44     return 0;
45 }

Aguin

CodeForces - 441E

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 double dp[205][2][250][1<<8];
 6 
 7 int main(void)
 8 {
 9     int x, K, p;
10     scanf("%d %d %d", &x, &K, &p);
11     if(x & (1 << 8))
12     {
13         int p = 0;
14         while(x & (1LL << (9 + p))) p++;
15         dp[0][1][p][x&((1<<8)-1)] = 1;
16     }
17     else
18     {
19         if((1 << 9) > x) dp[0][0][0][x&((1<<8)-1)] = 1;
20         else
21         {
22             int p = 0;
23             while(!(x & (1LL << (9 + p)))) p++;
24             dp[0][0][p+1][x&((1<<8)-1)] = 1;
25         }
26     }
27     double p1 = 1.0 * p / 100, p2 = 1 - p1;
28     for(int i = 0; i < K; i++)
29     for(int o = 0; o <= 1; o++)
30     for(int j = 0; j < 250; j++)
31     for(int k = 0; k < (1 << 8); k++)
32     for(int op = 0; op <= 1; op++)
33     {
34         if(op == 0)
35         {
36             int b8 = k & (1 << 7);
37             int nk = (k << 1) & ((1 << 8) - 1);
38             if(b8)
39             {
40                 if(o) dp[i+1][1][j+1][nk] += dp[i][o][j][k] * p1;
41                 else dp[i+1][1][0][nk] += dp[i][o][j][k] * p1;
42             }
43             else
44             {
45                 if(o) dp[i+1][0][1][nk] += dp[i][o][j][k] * p1;
46                 else if(!j) dp[i+1][0][0][nk] += dp[i][o][j][k] * p1;
47                 else dp[i+1][0][j+1][nk] += dp[i][o][j][k] * p1;
48             }
49         }
50         else
51         {
52             int nk = (k + 1) & ((1 << 8) - 1);
53             int b8 = k & (1 << 7), nb8 = nk & (1 << 7);
54             if(b8 && !nb8)
55             {
56                 if(o) dp[i+1][0][j+1][nk] += dp[i][o][j][k] * p2;
57                 else dp[i+1][1][0][nk] += dp[i][o][j][k] * p2;
58             }
59             else dp[i+1][o][j][nk] += dp[i][o][j][k] * p2;
60         }
61     }
62     double ans = 0;
63     for(int o = 0; o <= 1; o++)
64     for(int j = 0; j < 250; j++)
65     for(int k = 0; k < (1 << 8); k++)
66     {
67         if(!k)
68         {
69             if(!o) ans += dp[K][o][j][k] * (8 + j);
70             else ans += dp[K][o][j][k] * 8;
71         }
72         else
73         {
74             int cnt = 0;
75             while(!(k & (1 << cnt))) cnt++;
76             ans += dp[K][o][j][k] * cnt;
77         }
78     }
79     printf("%.10f
", ans);
80     return 0;
81 }

Aguin

2.11

CodeForces - 660E

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const LL mod = 1e9 + 7;
 6 const int maxn = 1e6 + 10;
 7 LL dp[maxn];
 8 
 9 LL qpow(LL a, LL b)
10 {
11     LL ret = 1LL;
12     while(b)
13     {
14         if(b & 1) ret = ret * a % mod;
15         a = a * a % mod;
16         b >>= 1;
17     }
18     return ret;
19 }
20 
21 int main(void)
22 {
23     int n, m;
24     scanf("%d %d", &n, &m);
25     dp[0] = 1;
26     for(int i = 1; i <= n; i++) dp[i] = (dp[i-1] * (2 * m - 1) + qpow(m, i - 1)) % mod;
27     printf("%I64d
", dp[n]);
28     return 0;
29 }

Aguin

SPOJ - BOKAM143SOU

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int maxn = 222222;
 5 int dp[6][maxn];
 6 
 7 int main(void)
 8 {
 9     dp[0][0] = 1;
10     for(int k = 1; k * k * k < maxn; k++)
11         for(int i = 0; i + k * k * k < maxn; i++)
12             for(int j = 0; j < 5; j++)
13                 dp[j+1][i+k*k*k] += dp[j][i];
14     int N;
15     scanf("%d", &N);
16     printf("%d
", dp[5][N] + dp[4][N] + dp[3][N] + dp[2][N] + dp[1][N]);
17     return 0;
18 }

Aguin

CodeForces - 615D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <map>
 4 using namespace std;
 5 typedef long long LL;
 6 const LL mod = 1e9 + 7;
 7 map<LL, LL> M;
 8 map<LL, LL> :: iterator it;
 9 
10 LL qpow(LL a, LL b)
11 {
12     LL ret = 1LL;
13     while(b)
14     {
15         if(b & 1) ret = ret * a % mod;
16         a = a * a % mod;
17         b >>= 1;
18     }
19     return ret;
20 }
21 
22 int main(void)
23 {
24     int m;
25     scanf("%d", &m);
26     for(int i = 1; i <= m; i++)
27     {
28         LL x;
29         scanf("%I64d", &x);
30         M[x]++;
31     }
32     LL mul = 1, ans = 1;
33     for(it = M.begin(); it != M.end(); it++) mul = (mul * (1 + (*it).second)) % (mod + mod - 2);
34     for(it = M.begin(); it != M.end(); it++) ans = (ans * qpow((*it).first, mul * (*it).second % (mod + mod - 2) / 2)) % mod;
35     printf("%I64d
", ans);
36     return 0;
37 }

Aguin

SPOJ - NPC2015A

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 using namespace std;
 5 const int maxn = 1e6 + 10;
 6 char s[maxn];
 7 int f[26], l[26];
 8 
 9 int main(void)
10 {
11     scanf("%s", s + 1);
12     int len = strlen(s + 1);
13     for(int i = 1; i <= len; i++) l[s[i]-'A'] = i;
14     for(int i = len; i >= 1; i--) f[s[i]-'A'] = i;
15     int N;
16     scanf("%d", &N);
17     while(N--)
18     {
19         char s1[22], s2[22];
20         scanf("%s %s", s1, s2);
21         if(f[s1[0]-'A'] && f[s1[0]-'A'] < l[s2[0]-'A']) puts("YA");
22         else puts("TIDAK");
23     }
24     return 0;
25 }

Aguin

2.13

SPOJ - BITDIFF

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const LL mod = 10000007;
 6 const int maxn = 1e4 + 10;
 7 LL a[maxn];
 8 
 9 int main(void)
10 {
11     int T;
12     scanf("%d", &T);
13     for(int kase = 1; kase <= T; kase++)
14     {
15         int N;
16         scanf("%d", &N);
17         for(int i = 1; i <= N; i++) scanf("%lld", a + i);
18         LL ans = 0;
19         for(int i = 0; i <= 32; i++)
20         {
21             int z = 0, o = 0;
22             LL k = 1LL << i;
23             for(int j = 1; j <= N; j++)
24             {
25                 if(a[j] & k) o++;
26                 else z++;
27             }
28             ans = (ans + (LL) o * z * 2) % mod;
29         }
30         printf("Case %d: %lld
", kase, ans);
31     }
32     return 0;
33 }

Aguin

SPOJ - VISIBLEBOX

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 const int maxn = 1e5 + 10;
 6 int a[maxn];
 7 
 8 int main(void)
 9 {
10     int T;
11     scanf("%d", &T);
12     for(int kase = 1; kase <= T; kase++)
13     {
14         int N;
15         scanf("%d", &N);
16         for(int i = 1; i <= N; i++) scanf("%d", a + i);
17         sort(a + 1, a + 1 + N);
18         int p = 1, ans = N;
19         for(int i = 1; i <= N; i++)
20             if(a[p] + a[p] <= a[i]) p++, ans--;
21         printf("Case %d: %d
", kase, ans);
22     }
23     return 0;
24 }

Aguin

2.14

SPOJ - BIPCSMR16

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 typedef long long LL;
 6 
 7 int main(void)
 8 {
 9     int T;
10     scanf("%d", &T);
11     while(T--)
12     {
13         LL a, b, c;
14         scanf("%lld %lld %lld", &a, &b, &c);
15         LL ans = (a + b + c) / 3;
16         ans = min(ans, a + b);
17         ans = min(ans, a + c);
18         ans = min(ans, c + b);
19         printf("%lld
", ans);
20     }
21     return 0;
22 }

Aguin

SPOJ - BLMIRINA

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cmath>
 4 using namespace std;
 5 const double eps = 1e-9;
 6 
 7 int main(void)
 8 {
 9     int T;
10     scanf("%d", &T);
11     while(T--)
12     {
13         int x, y, r;
14         scanf("%d %d %d", &x, &y, &r);
15         double L = 0, R = x;
16         while(R - L > eps)
17         {
18             double mid = (L + R) / 2;
19             double t = sqrt(x * x + y * y - r * r - mid * mid);
20             if((mid - x) * (mid - x) + (t - y) * (t - y) > r * r) L = mid;
21             else R = mid;
22         }
23         printf("%.6f %.6f
", L, sqrt(x * x + y * y - r * r - L * L));
24     }
25     return 0;
26 }

Aguin

2.16

SPOJ - BGSHOOT

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 #include <vector>
 5 using namespace std;
 6 const int maxn = 1e5 + 10;
 7 int X[maxn], Y[maxn], L[maxn], R[maxn];
 8 vector<int> v;
 9 
10 // ST
11 int a[maxn<<2], rmq[maxn<<2][20];
12 void RMQ_init(int n)
13 {
14     for(int i = 1; i <= n; i++) rmq[i][0] = a[i];
15     for(int j = 1; (1 << j) <= n; j++)
16         for(int i = 1; i + ( 1 << j ) - 1 <= n; i++)
17             rmq[i][j] = max(rmq[i][j-1] , rmq[i+(1<<j-1)][j-1]);
18 }
19 int RMQ_query(int l, int r)
20 {
21     int k = 0;
22     while( ( 1 << (k + 1) ) <= r - l + 1 ) k++;
23     return max(rmq[l][k], rmq[r-(1<<k)+1][k]);
24 }
25 
26 
27 int main(void)
28 {
29     int N, Q;
30     scanf("%d", &N);
31     for(int i = 1; i <= N; i++) scanf("%d %d", X + i, Y + i), v.push_back(X[i]), v.push_back(Y[i] + 1);
32     scanf("%d", &Q);
33     for(int i = 1; i <= Q; i++) scanf("%d %d", L + i, R + i), v.push_back(L[i]), v.push_back(R[i]);
34     sort(v.begin(), v.end());
35     v.erase(unique(v.begin(), v.end()), v.end());
36     for(int i = 1; i <= N; i++)
37     {
38         int x = lower_bound(v.begin(), v.end(), X[i]) - v.begin() + 1;
39         a[x]++;
40         int y = lower_bound(v.begin(), v.end(), Y[i] + 1) - v.begin() + 1;
41         a[y]--;
42     }
43     for(int i = 1; i <= v.size(); i++) a[i] += a[i-1];
44     RMQ_init(v.size());
45     for(int i = 1; i <= Q; i++)
46     {
47         int l = lower_bound(v.begin(), v.end(), L[i]) - v.begin() + 1;
48         int r = lower_bound(v.begin(), v.end(), R[i]) - v.begin() + 1;
49         printf("%d
", RMQ_query(l, r));
50     }
51     return 0;
52 }

Aguin

SPOJ - ANTP

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 typedef long long LL;
 6 const LL mod = 1e9 + 7;
 7 const int maxn = 1e6 + 10;
 8 LL sum[maxn];
 9 
10 int main(void)
11 {
12     for(int i = 1; i < maxn; i++) sum[i] = (sum[i-1] + (LL) i * (i - 1) / 2) % mod;
13     int T;
14     scanf("%d", &T);
15     while(T--)
16     {
17         int x, y;
18         scanf("%d %d", &x, &y);
19         printf("%lld
", (sum[y-1] - sum[max(0,x-2)] + mod) % mod);
20     }
21     return 0;
22 }

Aguin

HackerRank - the-chosen-one

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const int maxn = 1e5 + 10;
 6 LL a[maxn], L[maxn], R[maxn];
 7 
 8 LL gcd(LL a, LL b)
 9 {
10     return a % b ? gcd(b, a % b) : b;
11 }
12 
13 int main(void)
14 {
15     int n;
16     scanf("%d", &n);
17     for(int i = 1; i <= n; i++) scanf("%lld", a + i);
18     L[1] = a[1];
19     for(int i = 2; i <= n; i++) L[i] = gcd(L[i-1], a[i]);
20     R[n] = a[n];
21     for(int i = n - 1; i; i--) R[i] = gcd(R[i+1], a[i]);
22     if(a[1] % R[2]) {printf("%lld
", R[2]); return 0;}
23     else for(int i = 2; i < n; i++)
24     {
25         LL g = gcd(L[i-1], R[i+1]);
26         if(a[i] % g) {printf("%lld
", g); return 0;}
27     }
28     printf("%lld
", L[n-1]);
29     return 0;
30 }

Aguin

2.17

HDU - 3038

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const int maxn = 2e5 + 10;
 6 int fa[maxn];
 7 LL r[maxn];
 8 
 9 int Find(int x)
10 {
11     if(fa[x] == x) return x;
12     int y = Find(fa[x]);
13     r[x] += r[fa[x]];
14     return fa[x] = y;
15 }
16 
17 int main(void)
18 {
19     int N, M;
20     while(~scanf("%d %d", &N, &M))
21     {
22         int ans = 0;
23         for(int i = 0; i <= N; i++) fa[i] = i, r[i] = 0;
24         while(M--)
25         {
26             int A, B, S;
27             scanf("%d %d %d", &A, &B, &S);
28             A--;
29             if(Find(A) != Find(B))
30             {
31                 int FA = Find(A), FB = Find(B);
32                 fa[FA] = FB, r[FA] = r[B] - r[A] + S;
33             }
34             else if(r[A] - r[B] != S) ans++;
35         }
36         printf("%d
", ans);
37     }
38     return 0;
39 }

Aguin

CodeForces - 406D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 typedef long long LL;
 6 const int maxn = 1e5 + 10;
 7 
 8 // edge
 9 int cnt, h[maxn];
10 struct edge
11 {
12     int to, pre;
13 } e[maxn<<1];
14 void add(int from, int to)
15 {
16     cnt++;
17     e[cnt].pre = h[from];
18     e[cnt].to = to;
19     h[from] = cnt;
20 }
21 
22 // LCA
23 int dep[maxn];
24 int anc[maxn][33];
25 void dfs(int x, int fa)
26 {
27     for(int i = h[x]; i; i = e[i].pre)
28     {
29         int to = e[i].to;
30         if(to == fa) continue;
31         dep[to] = dep[x] + 1;
32         anc[to][0] = x;
33         dfs(to, x);
34     }
35 }
36 void LCA_init(int n)
37 {
38     for(int j = 1; (1 << j) < n; j++)
39         for(int i = 1; i <= n; i++) if(anc[i][j-1])
40             anc[i][j] = anc[anc[i][j-1]][j-1];
41 }
42 int LCA(int u, int v)
43 {
44     int log;
45     if(dep[u] < dep[v]) swap(u, v);
46     for(log = 0; (1 << log) < dep[u]; log++);
47     for(int i = log; i >= 0; i--)
48         if(dep[u] - (1<<i) >= dep[v]) u = anc[u][i];
49     if(u == v) return u;
50     for(int i = log; i >= 0; i--)
51         if(anc[u][i] && anc[u][i] != anc[v][i])
52             u = anc[u][i], v = anc[v][i];
53     return anc[u][0];
54 }
55 
56 LL X[maxn], Y[maxn];
57 int st[maxn];
58 int main(void)
59 {
60     int n, m;
61     scanf("%d", &n);
62     for(int i = 1; i <= n; i++) scanf("%lld %lld", X + i, Y + i);
63     st[0] = n;
64     int p = 0;
65     for(int i = n - 1; i; i--)
66     {
67         while(p && (Y[st[p-1]] - Y[st[p]]) * (X[st[p-1]] - X[i]) > (Y[st[p-1]] - Y[i]) * (X[st[p-1]] - X[st[p]])) p--;
68         add(st[p], i), add(i, st[p]);
69         st[++p] = i;
70     }
71     dfs(n, 0);
72     LCA_init(n);
73     scanf("%d", &m);
74     while(m--)
75     {
76         int a, b;
77         scanf("%d %d", &a, &b);
78         printf("%d ", LCA(a, b));
79     }
80     return 0;
81 }

Aguin

2.18

CodeForces - 372E

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <algorithm>
 5 #include <cmath>
 6 using namespace std;
 7 typedef long long LL;
 8 const LL mod = 1e9 + 7;
 9 const double eps = 1e-9;
10 double x[1111], y[1111];
11 
12 struct node
13 {
14     double x, y, k;
15     node(double x = 0, double y = 0, double k = 0): x(x), y(y), k(k) {}
16     friend bool operator < (node A, node B)
17     {
18         if(fabs(A.x - B.x) > eps) return A.x < B.x;
19         if(fabs(A.y - B.y) > eps) return A.y < B.y;
20         return A.k < B.k;
21     }
22 };
23 vector<node> v;
24 
25 int main(void)
26 {
27     int n;
28     scanf("%d", &n);
29     for(int i = 1; i <= n; i++)
30     {
31         double a, b, c, d;
32         scanf("%lf %lf %lf %lf", &a, &b, &c, &d);
33         x[i] = a / b, y[i] = c / d;
34         double t = x[i] * x[i] + y[i] * y[i];
35         x[i] /= t, y[i] /= t;
36     }
37     for(int i = 1; i <= n; i++)
38     for(int j = i + 1; j <= n; j++)
39     {
40         double xx = (x[i] + x[j]) / 2;
41         double yy = (y[i] + y[j]) / 2;
42         double kk;
43         if(fabs(x[i] - x[j]) < eps) kk = 1e9;
44         else kk = (y[j] - y[i]) / (x[j] - x[i]);
45         v.push_back(node(xx, yy, kk));
46     }
47     sort(v.begin(), v.end());
48     LL ans = 0;
49     for(int i = 0; i < v.size(); i++)
50     {
51         LL cnt = 2, tmp = 1;
52         for(int j = i + 1; j <= v.size(); j++)
53         {
54             if(j == v.size() || fabs(v[j].x - v[i].x) > eps || fabs(v[j].y - v[i].y) > eps)
55             {
56                 tmp = (tmp * cnt) % mod;
57                 ans = (ans + tmp + mod - 1) % mod;
58                 i = j - 1; break;
59             }
60             if(fabs(v[j].k - v[j-1].k) < eps) cnt++;
61             else tmp = (tmp * cnt) % mod, cnt = 2;
62         }
63     }
64     printf("%I64d
", (ans - v.size() + mod) % mod);
65     return 0;
66 }

Aguin

CodeForces - 697F

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <cstring>
  4 #include <queue>
  5 #include <algorithm>
  6 using namespace std;
  7 typedef long long LL;
  8 const int maxn = 222;
  9 int a[222];
 10 
 11 struct Matrix
 12 {
 13     LL m[maxn][maxn];
 14     Matrix(){memset(m, 0, sizeof(m));}
 15     void E(){memset(m, 0, sizeof(m)); for(int i = 0; i < maxn; i++) m[i][i] = 1;}
 16 };
 17 
 18 Matrix M_mul(Matrix a, Matrix b)
 19 {
 20     Matrix ret;
 21     memset(ret.m, -1, sizeof(ret.m));
 22     for(int i = 0; i < maxn; i++)
 23         for(int j = 0; j < maxn; j++)
 24             for(int k = 0; k < maxn; k++)
 25                 if(a.m[i][k] != -1 && b.m[k][j] != -1)
 26                     ret.m[i][j] = max(ret.m[i][j], a.m[i][k] + b.m[k][j]);
 27     return ret;
 28 }
 29 
 30 Matrix M_qpow(Matrix P, LL n)
 31 {
 32     Matrix ret = P;
 33     while(n)
 34     {
 35         if(n & 1LL) ret = M_mul(ret, P);
 36         n >>= 1LL;
 37         P = M_mul(P, P);
 38     }
 39     return ret;
 40 }
 41 
 42 const int maxnode = 222, sigma_size = 26;
 43 struct Ac_auto
 44 {
 45     int Next[maxnode][sigma_size];
 46     int fail[maxnode];
 47     LL val[maxnode];
 48     int sz;
 49 
 50     Ac_auto(){sz = 1; memset(Next[0], 0, sizeof(Next[0]));}
 51     void init(){sz = 1; memset(Next[0], 0, sizeof(Next[0]));}
 52 
 53     int idx(char c){return c - 'a';}
 54 
 55     void insert(char * s, int v)
 56     {
 57         int u = 0, n = strlen(s);
 58         for(int i = 0; i < n; i++)
 59         {
 60             int c = idx(s[i]);
 61             if(!Next[u][c])
 62             {
 63                 memset(Next[sz], 0, sizeof(Next[sz]));
 64                 Next[u][c] = sz++;
 65                 val[sz] = 0;
 66             }
 67             u = Next[u][c];
 68         }
 69         val[u] = val[u] + v;
 70     }
 71 
 72     void build()
 73     {
 74         queue<int> q;
 75         fail[0] = 0;
 76         for(int i = 0; i < sigma_size; i++) if(Next[0][i])
 77         {
 78             fail[Next[0][i]] = 0;
 79             q.push(Next[0][i]);
 80         }
 81         while(!q.empty())
 82         {
 83             int pos = q.front(); q.pop();
 84             for(int i = 0; i < sigma_size; i++)
 85             {
 86                 if(!Next[pos][i]) Next[pos][i] = Next[fail[pos]][i];
 87                 else
 88                 {
 89                     fail[Next[pos][i]] = Next[fail[pos]][i];
 90                     q.push(Next[pos][i]);
 91                 }
 92             }
 93         }
 94     }
 95 
 96     Matrix solve()
 97     {
 98         Matrix ret;
 99         memset(ret.m, -1, sizeof(ret.m));
100         for(int i = 0; i < sz; i++)
101         for(int j = 0; j < sigma_size; j++)
102         {
103             int u = Next[i][j], v = u;
104             if(!u) continue;
105             LL tmp = 0;
106             while(v)
107             {
108                 tmp = tmp + val[v];
109                 v = fail[v];
110             }
111             ret.m[i][u] = tmp;
112         }
113         return ret;
114     }
115 
116 } ACA;
117 
118 int main(void)
119 {
120     int n;
121     LL L;
122     scanf("%d %I64d", &n, &L);
123     for(int i = 1; i <= n; i++) scanf("%d", a + i);
124     char s[222];
125     for(int i = 1; i <= n; i++) scanf("%s", s), ACA.insert(s, a[i]);
126     ACA.build();
127     Matrix O = ACA.solve();
128     O = M_qpow(O, L - 1);
129     LL ans = 0;
130     for(int i = 0; i < ACA.sz; i++) ans = max(ans, O.m[0][i]);
131     printf("%I64d
", ans);
132     return 0;
133 }

Aguin

CodeForces - 670E

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int maxn = 5e5 + 10;
 5 char s[maxn], op[maxn];
 6 
 7 struct List
 8 {
 9     int x, y, pre, nxt;
10     List(){}
11 } L[maxn];
12 
13 int st[maxn];
14 int main(void)
15 {
16     int n, m, p;
17     scanf("%d %d %d", &n, &m, &p);
18     scanf("%s", s + 1);
19     scanf("%s", op + 1);
20 
21     int tp = 0;
22     for(int i = 1; i <= n; i++)
23     {
24         L[i].pre = i - 1;
25         L[i].nxt = i + 1;
26         if(s[i] == '(') L[i].x = 1, st[++tp] = i;
27         else
28         {
29             L[i].x = -1;
30             L[i].y = st[tp];
31             L[st[tp]].y = i;
32             tp--;
33         }
34     }
35     L[0].nxt = 1, L[n+1].pre = n;
36 
37     for(int i = 1; i <= m; i++)
38     {
39         if(op[i] == 'L') p = L[p].pre;
40         else if(op[i] == 'R') p = L[p].nxt;
41         else
42         {
43             int x = p;
44             int y = L[p].y;
45             if(x > y) swap(x, y);
46             p = L[y].nxt;
47             L[L[x].pre].nxt = L[y].nxt;
48             L[L[y].nxt].pre = L[x].pre;
49             if(p == n + 1) p = L[p].pre;
50         }
51     }
52 
53     p = L[0].nxt;
54     while(p != n + 1)
55     {
56         putchar(L[p].x == 1 ? '(' : ')');
57         p = L[p].nxt;
58     }
59     return 0;
60 }

Aguin

2.21

CodeForces - 725F

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <queue>
 4 using namespace std;
 5 typedef long long LL;
 6 const int maxn = 1e5 + 10;
 7 int a1[maxn], b1[maxn], a2[maxn], b2[maxn];
 8 
 9 struct node
10 {
11     int i, j;
12     LL x;
13     node(int i = 0, int j = 0, LL x = 0): i(i), j(j), x(x) {}
14     friend bool operator < (node A, node B)
15     {
16         return A.x < B.x;
17     }
18 };
19 priority_queue<node> pq;
20 
21 int main(void)
22 {
23     int n;
24     scanf("%d", &n);
25     for(int i = 1; i <= n; i++) scanf("%d %d %d %d", a1 + i, b1 + i, a2 + i, b2 + i);
26     LL ans = 0;
27     for(int i = 1; i <= n; i++)
28     {
29         if(a1[i] <= b2[i] && b1[i] <= a2[i]) continue;
30         if(a1[i] + b1[i] <= a2[i] + b2[i])
31         {
32             if(a1[i] > b2[i]) ans = ans + a1[i] - b2[i];
33             else ans = ans + a2[i] - b1[i];
34         }
35         else pq.push(node(i, 1, a1[i] + b1[i]));
36     }
37     int o = 0;
38     while(!pq.empty())
39     {
40         o ^= 1;
41         node tmp = pq.top(); pq.pop();
42         if(tmp.j == 1)
43         {
44             if(o) ans += a1[tmp.i];
45             else ans -= b1[tmp.i];
46             pq.push(node(tmp.i, 2, a2[tmp.i] + b2[tmp.i]));
47         }
48         else
49         {
50             if(o) ans += a2[tmp.i];
51             else ans -= b2[tmp.i];
52         }
53     }
54     printf("%I64d
", ans);
55     return 0;
56 }

Aguin

Gym - 100820G

#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
typedef long long LL;
const int maxn = 1e5 + 10;

struct gem
{
    LL a, b;
    gem(LL a = 0, LL b = 0): a(a), b(b) {}
    friend bool operator < (gem A, gem B)
    {
        if(A.a != B.a) return A.a < B.a;
        return A.b < B.b;
    }
} g[maxn];

LL dp[maxn];
int main(void)
{
    int n, r, w, h;
    scanf("%d %d %d %d", &n, &r, &w, &h);
    for(int i = 1; i <= n; i++)
    {
        int x, y;
        scanf("%d %d", &x, &y);
        g[i] = gem(y + (LL) r * x, y + (LL) r * (w - x));
    }
    sort(g + 1, g + 1 + n);
    for(int i = 1; i <= n; i++) dp[i] = 1e18;
    int ans = 0;
    for(int i = 1; i <= n; i++)
    {
        int x = upper_bound(dp + 1, dp + n, g[i].b) - dp;
        dp[x] = g[i].b;
        ans = max(ans, x);
    }
    printf("%d
", ans);
    return 0;
}

Aguin

SPOJ - FACVSPOW

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cmath>
 4 using namespace std;
 5 const int maxn = 4e6 + 10;
 6 double sum[maxn];
 7 
 8 int main(void)
 9 {
10     for(int i = 1; i < maxn; i++) sum[i] = sum[i-1] + log(i);
11     for(int i = 1; i < maxn; i++) sum[i] /= i;
12     int T;
13     scanf("%d", &T);
14     while(T--)
15     {
16         int a;
17         scanf("%d", &a);
18         printf("%d
", lower_bound(sum + 1, sum + maxn, log(a)) - sum);
19     }
20     return 0;
21 }

Aguin

AtCoder - 2334

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int maxn = 1e5 + 10;
 5 char s[maxn];
 6 int a[maxn];
 7 
 8 int main(void)
 9 {
10     int N;
11     scanf("%d %s", &N, s + 1);
12     for(int p = 0; p <= 1; p++)
13     for(int q = 0; q <= 1; q++)
14     {
15         a[1] = p, a[2] = q;
16         for(int i = 3; i <= N; i++) a[i] = a[i-2] ^ a[i-1] ^ (s[i-1] == 'x');
17         if(a[1] != a[N-1] ^ a[N] ^ (s[N] == 'x')) continue;
18         if(a[2] != a[N] ^ a[1] ^ (s[1] == 'x')) continue;
19         for(int i = 1; i <= N; i++) putchar(a[i] ? 'W' : 'S');
20         puts(""); return 0;
21     }
22     puts("-1");
23     return 0;
24 }

Aguin

SPOJ - ODDDIV

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <algorithm>
 5 using namespace std;
 6 typedef long long LL;
 7 vector<LL> v[11111];
 8 
 9 int main(void)
10 {
11     for(int i = 1; i <= 1e5; i++)
12     {
13         int x = i, tot = 1;
14         for(int j = 2; j * j <= x; j++)
15         {
16             if(x % j) continue;
17             int cnt = 0;
18             while(x % j == 0) x /= j, cnt++;
19             tot *= cnt * 2 + 1;
20         }
21         if(x != 1) tot *= 3;
22         if(tot <= 10000) v[tot].push_back((LL) i * i);
23     }
24     int T;
25     scanf("%d", &T);
26     while(T--)
27     {
28         int k;
29         LL l, r;
30         scanf("%d %lld %lld", &k, &l, &r);
31         printf("%d
", upper_bound(v[k].begin(), v[k].end(), r) - lower_bound(v[k].begin(), v[k].end(), l));
32     }
33     return 0;
34 }

Aguin

CodeForces - 3D

#include <iostream>
#include <cstdio>
#include <cstring>
#include <queue>
using namespace std;
typedef long long LL;
typedef pair<LL, LL> pii;
const int maxn = 5e4 + 10;
char s[maxn];
priority_queue<pii> pq;

int main(void)
{
    scanf("%s", s + 1);
    int len = strlen(s + 1), a, b, cnt = 0, ok = 1;
    LL ans = 0;
    for(int i = 1; i <= len; i++)
    {
        if(s[i] == '(') cnt++;
        else if(s[i] == ')') cnt--;
        else
        {
            scanf("%d %d", &a, &b);
            ans += b;
            s[i] = ')';
            pq.push(pii(b - a, i));
            cnt--;
        }
        if(cnt < 0)
        {
            if(pq.empty()) {ok = 0; break;}
            cnt += 2;
            pii tmp = pq.top(); pq.pop();
            ans -= tmp.first;
            s[tmp.second] = '(';
        }
    }
    if(cnt) ok = 0;
    if(!ok) puts("-1");
    else printf("%I64d
%s
", ans, s + 1);
    return 0;
}

Aguin

2.22

CodeForces - 287D

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 const int maxn = 1e6 + 10;
 5 int a[maxn<<1];
 6 
 7 void change(int s, int d, int e)
 8 {
 9     if(s + d < e) change(s + d, d, e), a[s+d] = a[s];
10     else a[e] = a[s];
11 }
12 
13 int main(void)
14 {
15     int n;
16     scanf("%d", &n);
17     for(int i = 1; i <= n; i++) a[i] = i;
18     for(int i = 2; i <= n; i++) change(i - 1, i, i + n - 1);
19     for(int i = n; i < n + n; i++) printf("%d ", a[i]);
20     return 0;
21 }

Aguin

CodeForces - 21D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 const int INF = 1e9;
 6 int G[22][22], deg[22], dp[1<<16];
 7 
 8 int main(void)
 9 {
10     int n, m;
11     scanf("%d %d", &n, &m);
12     for(int i = 1; i <= n; i++)
13         for(int j = 1; j <= n; j++)
14             G[i][j] = INF;
15     int ans = 0;
16     for(int i = 1; i <= m; i++)
17     {
18         int a, b, w;
19         scanf("%d %d %d", &a, &b, &w);
20         G[b][a] = G[a][b] = min(G[a][b], w);
21         ans += w; deg[a]++; deg[b]++;
22     }
23     for(int k = 1; k <= n; k++)
24         for(int i = 1; i <= n; i++)
25             for(int j = 1; j <= n; j++)
26                 G[i][j] = min(G[i][j], G[i][k] + G[k][j]);
27     for(int i = 2; i <= n; i++) if(deg[i] && G[1][i] == INF) return puts("-1");
28     for(int i = 1; i < (1 << n); i++) dp[i] = INF;
29     for(int i = 0; i < (1 << n); i++)
30     {
31         if(dp[i] == INF) continue;
32         int x = 0;
33         for(int j = 1; j <= n; j++)
34         if(deg[j] % 2 && !(i & (1 << (j - 1)))) {x = j; break;}
35         if(!x) continue;
36         for(int j = x + 1; j <= n; j++)
37         if(deg[j] % 2 && !(i & (1 << (j - 1)))) dp[i^(1<<(j-1))^(1<<(x-1))] = min(dp[i^(1<<(j-1))^(1<<(x-1))], dp[i] + G[x][j]);
38     }
39     int msk = 0;
40     for(int i = 1; i <= n; i++)
41         if(deg[i] % 2) msk |= 1 << (i - 1);
42     printf("%d
", ans + dp[msk]);
43     return 0;
44 }

Aguin

2.23

CodeForces - 732D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 #include <vector>
 5 using namespace std;
 6 const int maxn = 1e5 + 10;
 7 vector<int> vec[maxn];
 8 int d[maxn], a[maxn];
 9 int n, m;
10 
11 struct node
12 {
13     int id, t;
14     friend bool operator < (node A, node B)
15     {
16         return A.t < B.t;
17     }
18 } s[maxn];
19 
20 bool check(int day)
21 {
22     for(int i = 1; i <= m; i++)
23     {
24         if(!vec[i].size()) return false;
25         if(vec[i][0] > day) return false;
26         int tmp = upper_bound(vec[i].begin(), vec[i].end(), day) - vec[i].begin() - 1;
27         s[i].id = i, s[i].t = vec[i][tmp];
28     }
29     sort(s + 1, s + 1 + m);
30     long long sum = 0;
31     for(int i = 1; i <= m; i++)
32         if(s[i].t - 1 - sum < a[s[i].id]) return false;
33         else sum = sum + a[s[i].id] + 1;
34     return true;
35 }
36 
37 int main(void)
38 {
39     scanf("%d %d", &n, &m);
40     for(int i = 1; i <= n; i++)
41     {
42         scanf("%d", d + i);
43         if(d[i]) vec[d[i]].push_back(i);
44     }
45     for(int i = 1; i <= m; i++) scanf("%d", a + i);
46     int l = 0, r = n;
47     if(!check(n)) return puts("-1");
48     while(l < r)
49     {
50         int mid = l + (r - l) / 2;
51         if(check(mid)) r = mid;
52         else l = mid + 1;
53     }
54     printf("%d
", r);
55     return 0;
56 }

Aguin

CodeForces - 396B

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 
 6 bool prime(LL x)
 7 {
 8     for(int i = 2; i * i <= x; i++)
 9         if(x % i == 0) return false;
10     return true;
11 }
12 
13 LL gcd(LL a, LL b)
14 {
15     return a % b ? gcd(b, a % b) : b;
16 }
17 
18 int main(void)
19 {
20     int T;
21     scanf("%d", &T);
22     while(T--)
23     {
24         LL n;
25         scanf("%I64d", &n);
26         LL pk = n, pkk = n + 1;
27         while(!prime(pk)) pk--;
28         while(!prime(pkk)) pkk++;
29         LL a = pk * pkk - 2 * pkk + 2 * (n - pk + 1);
30         LL b = 2 * pk * pkk;
31         LL g = gcd(a, b);
32         printf("%I64d/%I64d
", a / g, b / g);
33     }
34     return 0;
35 }

Aguin

2.24

CodeForces - 449C

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <algorithm>
 5 #include <cstring>
 6 using namespace std;
 7 const int maxn = 1e6 + 10;
 8 int pr[maxn];
 9 
10 void GetPrime()
11 {
12     memset(pr, 0, sizeof(pr));
13     for(int i = 2; i < maxn; i++)
14     {
15         if(!pr[i]) pr[++pr[0]] = i;
16         for(int j = 1; j <= pr[0] && pr[j] * i < maxn; j++)
17         {
18             pr[i*pr[j]] = 1;
19             if(i % pr[j] == 0) break;
20         }
21     }
22 }
23 
24 int vis[maxn];
25 int main(void)
26 {
27     GetPrime();
28     int n;
29     scanf("%d", &n);
30     vector<int> a, b;
31     int ans = 0, two = 0, x = 2;
32     while(x <= n) b.push_back(x), x *= 2, two++;
33     for(int i = 2; pr[i] * 2 <= n; i++)
34     {
35         int cnt = 0;
36         for(int j = 1; j * pr[i] <= n; j++)
37         if(!vis[pr[i] * j]) {vis[pr[i] * j] = 1; cnt++;}
38         if(cnt % 2) two++;
39         ans += cnt / 2;
40     }
41     printf("%d
", ans + two / 2);
42     memset(vis, 0, sizeof(vis));
43     for(int i = 2; pr[i] * 2 <= n; i++)
44     {
45         for(int j = 1; j * pr[i] <= n; j++)
46         if(!vis[pr[i] * j])
47         {
48             vis[pr[i] * j] = 1;
49             if(j != 2) a.push_back(pr[i] * j);
50             else b.push_back(pr[i] * j);
51         }
52         if(a.size() % 2)
53         {
54             for(int j = 0; j + 1 < a.size(); j += 2) printf("%d %d
", a[j], a[j+1]);
55             printf("%d %d
", a[a.size()-1], b[b.size()-1]);
56             b.pop_back();
57             a.clear();
58         }
59         else
60         {
61             for(int j = 0; j + 1 < a.size(); j += 2) printf("%d %d
", a[j], a[j+1]);
62             a.clear();
63         }
64     }
65     for(int j = 0; j + 1 < b.size(); j += 2) printf("%d %d
", b[j], b[j+1]);
66     return 0;
67 }

Aguin

CodeForces - 711E

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 const LL mod = 1e6 + 3;
 6 
 7 LL qpow(LL a, LL b)
 8 {
 9     LL ret = 1LL;
10     while(b)
11     {
12         if(b & 1) ret = ret * a % mod;
13         a = a * a % mod;
14         b >>= 1;
15     }
16     return ret;
17 }
18 
19 LL inv(LL x)
20 {
21     return qpow(x, mod - 2);
22 }
23 
24 int main(void)
25 {
26     LL n, k;
27     scanf("%I64d %I64d", &n, &k);
28     if(n <= 60 && (1LL << n) < k) return puts("1 1");
29     LL e = (n % (mod - 1)) * ((k - 1) % (mod - 1)) % (mod - 1), d = 0, tmp = k - 1;
30     while(tmp) d = (d + (tmp /= 2)) % (mod - 1);
31     if(k - 1 >= mod) return 0 * printf("%I64d %I64d
", qpow(2, (e - d + mod - 1) % (mod - 1)), qpow(2, (e - d + mod - 1) % (mod - 1)));
32     LL m = 1;
33     for(int i = 1; i < k; i++) m = m * (qpow(2, n % (mod - 1)) - i + mod) % mod;
34     printf("%I64d %I64d
", (qpow(2, (e - d + mod - 1) % (mod - 1)) - m * inv(qpow(2, d)) % mod + mod) % mod, qpow(2, (e - d + mod - 1) % (mod - 1)));
35     return 0;
36 }

Aguin

2.27

CodeForces - 581F

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 using namespace std;
 5 const int maxn = 5005;
 6 int cnt, h[maxn];
 7 
 8 struct edge
 9 {
10     int to, pre;
11 } e[maxn<<1];
12 
13 void add(int from, int to)
14 {
15     cnt++;
16     e[cnt].pre = h[from];
17     e[cnt].to = to;
18     h[from] = cnt;
19 }
20 
21 int son[maxn], dp[maxn][maxn][2], cpy[maxn][maxn][2];
22 void dfs(int x, int f)
23 {
24     for(int j = 0; j < maxn; j++) dp[x][j][0] = dp[x][j][1] = maxn;
25     for(int i = h[x]; i; i = e[i].pre)
26     {
27         int to = e[i].to;
28         if(to == f) continue;
29         dfs(to, x);
30         memcpy(cpy[x], dp[x], sizeof(cpy[x]));
31         for(int j = 0; j < maxn; j++) dp[x][j][0] = dp[x][j][1] = maxn;
32         if(!son[x])
33             for(int k = 0; k <= son[to]; k++)
34                 dp[x][k][0] = min(dp[x][k][0], dp[to][k][0]),
35                 dp[x][k][0] = min(dp[x][k][0], dp[to][k][1] + 1),
36                 dp[x][k][1] = min(dp[x][k][1], dp[to][k][0] + 1),
37                 dp[x][k][1] = min(dp[x][k][1], dp[to][k][1]);
38         else
39             for(int j = son[x]; j >= 0; j--)
40                 for(int k = 0; k <= son[to]; k++)
41                     dp[x][j+k][0] = min(dp[x][j+k][0], cpy[x][j][0] + dp[to][k][0]),
42                     dp[x][j+k][0] = min(dp[x][j+k][0], cpy[x][j][0] + dp[to][k][1] + 1),
43                     dp[x][j+k][1] = min(dp[x][j+k][1], cpy[x][j][1] + dp[to][k][0] + 1),
44                     dp[x][j+k][1] = min(dp[x][j+k][1], cpy[x][j][1] + dp[to][k][1]);
45         son[x] += son[to];
46     }
47     if(!son[x]) dp[x][1][1] = dp[x][0][0] = 0, son[x] = 1;
48 }
49 
50 int deg[maxn];
51 int main(void)
52 {
53     int n;
54     scanf("%d", &n);
55     for(int i = 1; i < n; i++)
56     {
57         int u, v;
58         scanf("%d %d", &u, &v);
59         add(u, v), add(v, u);
60         deg[u]++, deg[v]++;
61     }
62     if(n == 2) return puts("1");
63     int rt = 1, lf = 0;
64     for(int i = 1; i <= n; i++)
65         if(deg[i] != 1) rt = i;
66         else lf++;
67     dfs(rt, 0);
68     printf("%d
", min(dp[rt][lf/2][0], dp[rt][lf/2][1]));
69     return 0;
70 }

Aguin

SPOJ - NETADMIN

  1 #include <iostream>
  2 #include <cstdio>
  3 #include <cstring>
  4 #include <algorithm>
  5 #include <queue>
  6 #include <vector>
  7 using namespace std;
  8 const int INF = 1e9;
  9 const int maxn = 1010;
 10 int lv[maxn], it[maxn];
 11 int cnt, h[maxn];
 12 
 13 struct edge
 14 {
 15     int to, pre, cap;
 16 } e[5000000];
 17 
 18 void init()
 19 {
 20     memset(h, -1, sizeof(h));
 21     cnt = 0;
 22 }
 23 
 24 void add(int from, int to, int cap)
 25 {
 26     e[cnt].pre = h[from];
 27     e[cnt].to = to;
 28     e[cnt].cap = cap;
 29     h[from] = cnt;
 30     cnt++;
 31 }
 32 
 33 void ad(int from, int to, int cap)
 34 {
 35     add(from, to, cap);
 36     add(to, from, 0);
 37 }
 38 
 39 void bfs(int s)
 40 {
 41     memset(lv, -1, sizeof(lv));
 42     queue<int> q;
 43     lv[s] = 0;
 44     q.push(s);
 45     while(!q.empty())
 46     {
 47         int v = q.front(); q.pop();
 48         for(int i = h[v]; i >= 0; i = e[i].pre)
 49         {
 50             int cap = e[i].cap, to = e[i].to;
 51             if(cap > 0 && lv[to] < 0)
 52             {
 53                 lv[to] = lv[v] + 1;
 54                 q.push(to);
 55             }
 56         }
 57     }
 58 }
 59 
 60 int dfs(int v, int t, int f)
 61 {
 62     if(v == t) return f;
 63     for(int &i = it[v]; i >= 0; i = e[i].pre)
 64     {
 65         int &cap = e[i].cap, to = e[i].to;
 66         if(cap > 0 && lv[v] < lv[to])
 67         {
 68             int d = dfs(to, t, min(f, cap));
 69             if(d > 0)
 70             {
 71                 cap -= d;
 72                 e[i^1].cap += d;
 73                 return d;
 74             }
 75         }
 76     }
 77     return 0;
 78 }
 79 
 80 int Dinic(int s, int t)
 81 {
 82     int flow = 0;
 83     while(1)
 84     {
 85         bfs(s);
 86         if(lv[t] < 0) return flow;
 87         memcpy(it, h, sizeof(it));
 88         int f;
 89         while((f = dfs(s, t, INF)) > 0) flow += f;
 90     }
 91 }
 92 
 93 
 94 vector<int> vec;
 95 int u[250000], v[250000];
 96 int main(void)
 97 {
 98     int T;
 99     scanf("%d", &T);
100     while(T--)
101     {
102         init();
103         int n, m, k;
104         scanf("%d %d %d", &n, &m, &k);
105         vec.clear();
106         for(int i = 1; i <= k; i++)
107         {
108             int x;
109             scanf("%d", &x);
110             vec.push_back(x);
111         }
112         for(int i = 1; i <= m; i++) scanf("%d %d", u + i, v + i);
113         int S = n + 1, T = S + 1;
114         int l = 1, r = k, mid;
115         while(l < r)
116         {
117             init();
118             int mid = l + (r - l) / 2;
119             ad(S, 1, INF);
120             for(int i = 0; i < vec.size(); i++) ad(vec[i], T, 1);
121             for(int i = 1; i <= m; i++) add(u[i], v[i], mid), add(v[i], u[i], mid);
122             if(Dinic(S, T) == k) r = mid;
123             else l = mid + 1;
124         }
125         printf("%d
", r);
126     }
127     return 0;
128 }

Aguin

2.28

ZOJ - 3328

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 
 5 int main(void)
 6 {
 7     int n;
 8     while(~scanf("%d", &n) && n) printf("%d
", n / 2);
 9     return 0;
10 }

Aguin

Kattis - cupid

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cmath>
 4 #include <algorithm>
 5 using namespace std;
 6 const int maxn = 1e6 + 10;
 7 int block, ca[maxn], cb[maxn], ans[maxn];
 8 int a[maxn], b[maxn];
 9 
10 struct query
11 {
12     int id, l, r;
13 }Q[maxn];
14 
15 bool cmp(query A, query B)
16 {
17     if(A.l / block != B.l / block) return A.l / block < B.l / block;
18     return A.r < B.r;
19 }
20 
21 int main(void)
22 {
23     int N, M, K;
24     scanf("%d %d %d", &N, &M, &K);
25     for(int i = 1; i <= N; i++) scanf("%d", a + i);
26     for(int i = 1; i <= N; i++) scanf("%d", b + i);
27     for(int i = 0; i < M; i++)
28         scanf("%d %d", &Q[i].l, &Q[i].r), Q[i].l++, Q[i].r++, Q[i].id = i;
29     block = sqrt(N), sort(Q, Q + M, cmp);
30     int l = 1, r = 0, tmp = 0;
31     for(int i = 0; i < M; i++)
32     {
33         while(r < Q[i].r)
34         {
35             r++;
36             if(cb[a[r]]) cb[a[r]]--, tmp++;
37             else ca[a[r]]++;
38             if(ca[b[r]]) ca[b[r]]--, tmp++;
39             else cb[b[r]]++;
40         }
41         while(r > Q[i].r)
42         {
43             if(ca[a[r]]) ca[a[r]]--;
44             else cb[a[r]]++, tmp--;
45             if(cb[b[r]]) cb[b[r]]--;
46             else ca[b[r]]++, tmp--;
47             r--;
48         }
49         while(l < Q[i].l)
50         {
51             if(ca[a[l]]) ca[a[l]]--;
52             else cb[a[l]]++, tmp--;
53             if(cb[b[l]]) cb[b[l]]--;
54             else ca[b[l]]++, tmp--;
55             l++;
56         }
57         while(l > Q[i].l)
58         {
59             l--;
60             if(cb[a[l]]) cb[a[l]]--, tmp++;
61             else ca[a[l]]++;
62             if(ca[b[l]]) ca[b[l]]--, tmp++;
63             else cb[b[l]]++;
64         }
65         ans[Q[i].id] = tmp;
66     }
67     for(int i = 0; i < M; i++) printf("%d
", ans[i]);
68     return 0;
69 }

Aguin

CodeForces - 493E

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cmath>
 4 using namespace std;
 5 typedef long long LL;
 6 LL c[1111];
 7 
 8 int main(void)
 9 {
10     LL t, a, b, ans = 0, cnt = 0, tmp;
11     scanf("%I64d %I64d %I64d", &t, &a, &b);
12     if(t == 1 && a == 1 && b == 1) return puts("inf");
13     if(t == 1 && a == 1) return puts("0");
14     if(a == 1 && b == 1) return puts("1");
15     if(a == 1) return puts("0");
16     for(tmp = a; tmp <= b; tmp *= a)
17     {
18         if(tmp == b) ans++;
19         if(log(tmp) + log(a) > log(b) + 1e-9) break;
20     }
21     while(b) c[++cnt] = b % a, b /= a;
22     tmp = 0;
23     for(int i = cnt; i; i--) tmp = tmp * t + c[i];
24     if(tmp == a && cnt > 1) ans++;
25     printf("%d
", ans);
26     return 0;
27 }

Aguin

3.1

Kattis - boxes

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <algorithm>
 5 using namespace std;
 6 typedef pair<int, int> pii;
 7 const int maxn = 2e5 + 10;
 8 int cnt, h[maxn], f[maxn];
 9 
10 struct edge
11 {
12     int to, pre;
13 } e[maxn<<1];
14 
15 void add(int from, int to)
16 {
17     cnt++;
18     e[cnt].pre = h[from];
19     e[cnt].to = to;
20     h[from] = cnt;
21 }
22 
23 int tot = 0;
24 int in[maxn], out[maxn];
25 void dfs(int x)
26 {
27     in[x] = ++tot;
28     for(int i = h[x]; i; i = e[i].pre) dfs(e[i].to);
29     out[x] = ++tot;
30 }
31 
32 vector<pii> v;
33 int main(void)
34 {
35     int N, Q;
36     scanf("%d", &N);
37     for(int i = 1; i <= N; i++)
38     {
39         scanf("%d", f + i);
40         if(f[i]) add(f[i], i);
41     }
42     for(int i = 1; i <= N; i++)
43         if(!f[i]) dfs(i);
44     scanf("%d", &Q);
45     while(Q--)
46     {
47         v.clear();
48         int M, x;
49         scanf("%d", &M);
50         for(int i = 1; i <= M; i++)
51         {
52             scanf("%d", &x);
53             v.push_back(pii(in[x], out[x]));
54         }
55         sort(v.begin(), v.end());
56         int ans = (v[0].second - v[0].first + 1) / 2;
57         for(int i = 1; i < M; i++)
58             if(v[i].second > v[i-1].second) ans += (v[i].second - v[i].first + 1) / 2;
59             else v[i] = v[i-1];
60         printf("%d
", ans);
61     }
62     return 0;
63 }

Aguin

3.2

HackerRank - lena-sort

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 using namespace std;
 5 typedef long long LL;
 6 const int maxn = 1e5 + 10;
 7 int cnt[maxn], tot;
 8 
 9 vector<int> v[maxn];
10 void dfs(int dep, int x)
11 {
12     if(cnt[dep+1] > x + x) dfs(dep + 1, x + x);
13     v[dep].push_back(++tot);
14     if(cnt[dep+1] > x + x + 1) dfs(dep + 1, x + x + 1);
15 }
16 
17 void ans_print(int dep, int x)
18 {
19     printf("%d ", v[dep][x]);
20     if(cnt[dep+1] > x + x) ans_print(dep + 1, x + x);
21     if(cnt[dep+1] > x + x + 1) ans_print(dep + 1, x + x + 1);
22 }
23 
24 int main(void)
25 {
26     int q;
27     scanf("%d", &q);
28     while(q--)
29     {
30         LL c;
31         int n, p = 1;
32         scanf("%d %lld", &n, &c);
33         c = -c;
34         for(int i = 0; i < n; i++) cnt[i] = 1, c += i, v[i].clear();
35         cnt[n] = 0;
36         if(c < 0) {puts("-1"); continue;}
37         for(int i = n - 1; i > p; i--)
38         {
39             int d = min(c, (LL) (i - p));
40             if(!d) break;
41             c -= d, cnt[i-d]++, cnt[i] = 0;
42             if(cnt[p] == cnt[p-1] + cnt[p-1]) p++;
43         }
44         if(c) {puts("-1"); continue;}
45         tot = 0;
46         dfs(0, 0), ans_print(0, 0), puts("");
47     }
48     return 0;
49 }

Aguin

3.3

CodeForces - 468C

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 typedef long long LL;
 5 
 6 int main(void)
 7 {
 8     LL a, tmp = 1e17, x = 0;
 9     scanf("%I64d", &a);
10     for(int i = 1; i <= 810; i++) x = (x + tmp) % a;
11     printf("%I64d %I64d
", a - x, a - x + 10 * tmp - 1);
12     return 0;
13 }

Aguin

CodeForces - 359D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 #include <vector>
 5 using namespace std;
 6 const int maxn = 3e5 + 10;
 7 int a[maxn], m[maxn][20], g[maxn][20];
 8 vector<int> v;
 9 
10 int gcd(int a, int b)
11 {
12     return a % b ? gcd(b, a % b) : b;
13 }
14 
15 void RMQ_init(int n)
16 {
17     for(int i = 1; i <= n; i++) m[i][0] = g[i][0] = a[i];
18     for(int j = 1; (1 << j) <= n; j++)
19         for(int i = 1; i + ( 1 << j ) - 1 <= n; i++)
20             m[i][j] = min(m[i][j-1] , m[i+(1<<j-1)][j-1]),
21             g[i][j] = gcd(g[i][j-1] , g[i+(1<<j-1)][j-1]);
22 }
23 
24 int mq(int l, int r)
25 {
26     int k = 0;
27     while( ( 1 << (k + 1) ) <= r - l + 1 ) k++;
28     return min(m[l][k], m[r-(1<<k)+1][k]);
29 }
30 
31 int gq(int l, int r)
32 {
33     int k = 0;
34     while( ( 1 << (k + 1) ) <= r - l + 1 ) k++;
35     return gcd(g[l][k], g[r-(1<<k)+1][k]);
36 }
37 
38 bool ok(int mid, int n)
39 {
40     for(int i = 1; i + mid - 1 <= n; i++)
41         if(mq(i, i + mid - 1) == gq(i, i + mid - 1))
42             return true;
43     return false;
44 }
45 
46 int main(void)
47 {
48     int n;
49     scanf("%d", &n);
50     for(int i = 1; i <= n; i++) scanf("%d", a + i);
51     RMQ_init(n);
52     int l = 1, r = n, mid;
53     while(l < r)
54     {
55         mid = r - (r - l) / 2;
56         if(ok(mid, n)) l = mid;
57         else r = mid - 1;
58     }
59     for(int i = 1; i + l - 1 <= n; i++)
60         if(mq(i, i + l - 1) == gq(i, i + l - 1))
61             v.push_back(i);
62     printf("%d %d
", v.size(), l - 1);
63     for(int i = 0; i < v.size(); i++) printf("%d ", v[i]);
64     return 0;
65 }

Aguin

CodeForces - 671B

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <algorithm>
 4 using namespace std;
 5 const int maxn = 5e5 + 10;
 6 typedef long long LL;
 7 int c[maxn];
 8 
 9 int main(void)
10 {
11     int n, k, M = 0, m = 2e9;
12     LL sum = 0;
13     scanf("%d %d", &n, &k);
14     for(int i = 1; i <= n; i++) scanf("%d", c + i), M = max(M, c[i]), m = min(m, c[i]), sum += c[i];
15     int l = (sum + n - 1) / n, r = M;
16     while(l < r)
17     {
18         LL cnt = 0;
19         int mid = (l + r) / 2;
20         for(int i = 1; i <= n; i++)
21             if(c[i] > mid) cnt += c[i] - mid;
22         if(cnt <= k) r = mid;
23         else l = mid + 1;
24     }
25     int u = r;
26     l = m, r = sum / n;
27     while(l < r)
28     {
29         LL cnt = 0;
30         int mid = r - (r - l) / 2;
31         for(int i = 1; i <= n; i++)
32             if(c[i] < mid) cnt += mid - c[i];
33         if(cnt <= k) l = mid;
34         else r = mid - 1;
35     }
36     int d = l;
37     printf("%d
", u - d);
38     return 0;
39 }

Aguin

3.4

CodeForces - 496D

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <vector>
 4 #include <algorithm>
 5 using namespace std;
 6 typedef pair<int, int> pii;
 7 const int maxn = 2e5 + 10;
 8 int a[maxn], p[maxn], g[maxn];
 9 vector<pii> v;
10 
11 int main(void)
12 {
13     int n;
14     scanf("%d", &n);
15     for(int i = 1; i <= n; i++) scanf("%d", a + i);
16     int P = 0, G = 0;
17     for(int i = 1; i <= n; i++)
18         if(a[i] == 1) p[++P] = i;
19         else g[++G] = i;
20     for(int i = n; i; i--)
21     {
22         int wp = 0, wg = 0;
23         P = G = 0;
24         while(1)
25         {
26             if(!p[P+i] && !g[G+i]) break;
27             if(!p[P+i]) G += i, P = g[G] - G, wg++;
28             else if(!g[G+i]) P += i, G = p[P] - P, wp++;
29             else if(p[P+i] < g[G+i]) P += i, G = p[P] - P, wp++;
30             else G += i, P = g[G] - G, wg++;
31             if(p[P] == n && wp > wg) {v.push_back(pii(wp, i)); break;}
32             if(g[G] == n && wg > wp) {v.push_back(pii(wg, i)); break;}
33         }
34     }
35     sort(v.begin(), v.end());
36     printf("%d
", v.size());
37     for(int i = 0; i < v.size(); i++) printf("%d %d
", v[i].first, v[i].second);
38     return 0;
39 }

Aguin

CodeForces - 524C

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <set>
 4 using namespace std;
 5 typedef long long LL;
 6 set<LL> s[22];
 7 LL a[5555];
 8 
 9 int main(void)
10 {
11     int n, k, q;
12     scanf("%d %d", &n, &k);
13     for(int i = 1; i <= n; i++) scanf("%lld", a + i);
14     for(int i = 1; i <= n; i++)
15         for(int j = 0; j <= k; j++)
16             s[j].insert(a[i] * j);
17     scanf("%d", &q);
18     while(q--)
19     {
20         LL x;
21         scanf("%lld", &x);
22         int ans = k + 1;
23         for(int i = 1; i <= n; i++)
24             for(int j = 0; j <= k && a[i] * j <= x; j++)
25                 for(int p = 0; p + j <= k; p++)
26                     if(s[p].find(x - a[i] * j) != s[p].end())
27                         ans = min(ans, j + p);
28         printf("%d
", ans == k + 1 ? -1 : ans);
29     }
30     return 0;
31 }

Aguin

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原文地址：https://www.cnblogs.com/Aguin/p/6380252.html