2019牛客暑期多校训练营（第六场）

题号	标题	已通过代码	题解/讨论	通过率	团队的状态
A	Garbage Classification	点击查看	进入讨论	1036/1650
B	Shorten IPv6 Address	点击查看	进入讨论	804/5504
C	Palindrome Mouse	点击查看	进入讨论	175/467
D	Move	点击查看	进入讨论	943/5467
E	Androgynos	点击查看	进入讨论	263/1029	补题通过
F	K-ary Heap	点击查看	进入讨论	33/100	未通过
G	Is Today Friday?	点击查看	进入讨论	465/2276	补题通过
H	Train Driver	点击查看	进入讨论	74/284	未通过
I	Can They Go to Galar?	点击查看	进入讨论	29/134	未通过
J	Upgrading Technology	点击查看	进入讨论	926/5235

ps：这场只做了C题，第一次场上做出来这种题，虽然花时间久了点。其他都队友做的orz

A

#include <bits/stdc++.h>
using namespace std;
int T;
char a[10005];
char b[30];
int kase = 0;
int main(){
    scanf("%d", &T);
    while(T--){
        scanf("%s%s", a, b);
        int h, d, w;
        d = w = h = 0;
        int n = 0;
        for(int i = 0; a[i]; i++){
            if(b[a[i] - 'a'] == 'h'){
                h++;
            }
            else if(b[a[i] - 'a'] == 'w'){
                w++;
            }
            else if(b[a[i] - 'a'] == 'd'){
                d++;
            }
            n++;
        }
        kase++;
        printf("Case #%d: ", kase);
        double p = double(h) / double(n);
        if(p >= 0.25){
            printf("Harmful
");
        }
        else if(p <= 0.1){
            printf("Recyclable
");
        }
        else if(d >= 2 * w){
            printf("Dry
");
        }
        else{
            printf("Wet
");
        }
    }
    return 0;
}

B

#include <bits/stdc++.h>
 
using namespace std;
 
int T;
 
char a[10005];
 
int kase = 0;
 
int b[50];
 
string c[10];
 
vector<string> ans;
 
int min_l;
 
char change(int a){
    if(a < 10){
        return a + '0';
    }
    else{
        return a - 10 + 'a';
    }
}
 
bool allzero(int l, int r){
    if(l > 0 && c[l - 1] == string("0")){
        return false;
    }
    if(r < 7 && c[r + 1] == string("0")){
        return false;
    }
    for(int i = l; i <= r; i++){
        if(c[i] != string("0")){
            return false;
        }
    }
    return true;
}
 
string solve_pre(){
    string p = string("");
    for(int i = 0; i < 8; i++){
        if(i != 0) p += ':';
        p += c[i];
    }
    min_l = min(min_l, int(p.length()));
    return p;
}
void solve(int l, int r){
    string p = string("");
    for(int i = 0; i < l; i++){
        if(i != 0) p += ':';
        p += c[i];
    }
    p += "::";
    for(int i = r + 1; i < 8; i++){
        if(i != r + 1) p += ':';
        p += c[i];
    }
    min_l = min(min_l, int(p.length()));
    ans.push_back(p);
}
int main(){
    scanf("%d", &T);
    while(T--){
        min_l = 10000;
        // 输入和初始化
        scanf("%s", a);
        memset(b, 0, sizeof(b));
        for(int i = 0; i < 10; i++){
            c[i] = string("");
        }
        ans.clear();
        // 四位转换成一个十六进制数
        int t = 0;
        int cnt = 0;
        for(int i = 0; i < 128; i++){
            if((i) && (i % 4 == 0)){
                b[cnt] = t;
                cnt++;
                t = 0;
            }
            t *= 2;
            t |= (a[i] - '0');
        }
        b[cnt] = t;
        // 四位十六进制合成一个字符串
        cnt = 0;
        string ts = string("");
        for(int i = 0; i < 32; i++){
            if(i && (i % 4 == 0)){
                if(ts == string("")){
                    ts = string("0");
                }
                c[cnt] = ts;
                cnt++;
                ts = string("");
            }
            if(ts == string("") && b[i] == 0){
                continue;
            }
            else{
                ts = ts + change(b[i]);
            }
        }
        if(ts == string("")){
            ts = string("0");
        }
        c[cnt] = ts;
        cnt = 0;
        ans.push_back(solve_pre());
        for(int i = 0; i < 8; i++){
            for(int j = i + 1; j < 8; j++){
                if(allzero(i, j)){
                    // cout << "lalala" << endl;
                    solve(i, j);
                }
            }
        }
        kase++;
        printf("Case #%d: ", kase);
        sort(ans.begin(), ans.end());
        for(int i = 0; i < ans.size(); i++){
            if(ans[i].length() == min_l){
                cout << ans[i] << endl;
                break;
            }
        }
        /*
        for(int i = 0; i < ans.size(); i++){
            cout << ans[i] << endl;
        }
        */
    }
    return 0;
}

C

写了篇题解：https://www.cnblogs.com/1625--H/p/11296121.html

D

#include <bits/stdc++.h>
using namespace std;
int n, k;
int a[1005];
  
bool check(int v) {
    bool vis[1005];
    memset(vis, 0, sizeof(bool) * (n + 2));
    int cn = 0;
    int cnt = 0;
    while(1) {
        int las = v;
        if(cn > k) break;
  
        for(int i = n; i >= 1; i--) {
            if(vis[i]) continue;
            if(a[i] <= las) {
                vis[i] = 1;
                las -= a[i];
                cnt++;
                if(cnt == n) break;
            }
        }
        cn++;
        if(cnt == n) break;
    }
    if(cnt < n || cn > k) return false;
    return true;
}
  
int main() {
    int T;
    scanf("%d", &T);
    int cas = 0;
    while(T--) {
        cas++;
        scanf("%d%d", &n, &k);
        int l = 1, r = 0;
        for(int i = 1; i <= n; i++) scanf("%d", &a[i]), r += a[i];
        sort(a + 1, a + 1 + n);
        l = a[n];
  
        int mid = l + r >> 1;
        while(l + 1 < r) {
            mid = l + r >> 1;
  
            if(check(mid)) r = mid;
            else l = mid;
        }
  
        int ans = 0;
        printf("Case #%d: ", cas);
        if(check(l)) ans = l;
        else ans = r;
        for(int i = l; i >= max(a[n], l - 100); i--) {
            if(check(i)) ans = i;
        }
        printf("%d
", ans);
    }
    return 0;
}

E

#include <bits/stdc++.h>
using namespace std;
 
int tu[2005][2005];
int f[2005];
int main() {
    int T;
    scanf("%d", &T);
    int cas = 0;
    while(T--) {
        int n;
        scanf("%d", &n);
        int tmp = n % 4;
        printf("Case #%d: ", ++cas);
        if(tmp == 2 || tmp == 3) {
            puts("No");
            continue;
        } else puts("Yes");
        for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++) tu[i][j] = 0;
        for(int i = 1; i <= n; i++) f[i] = -1;
 
        int blo = n / 4;
        for(int i = 1; i <= blo * 4; i++) {
            if(i <= blo) {
                for(int j = 1; j <= blo; j++) {
                    if(i == j) continue;
                    tu[i][j] = tu[j][i] = 1;
                }
                for(int j = blo + 1; j <= blo * 2; j++) tu[i][j] = tu[j][i] = 1;
                for(int j = blo * 2 + 1; j <= blo * 3; j++) tu[i][j] = tu[j][i] = 1;
                f[i] = blo * 3 + i;
            } else if(i > blo && i <= blo * 2) {
                for(int j = blo + 1; j <= blo * 2; j++) {
                    if(i == j) continue;
                    tu[i][j] = tu[j][i] = 1;
                }
                for(int j = blo * 3 + 1; j <= blo * 4; j++) tu[i][j] = tu[j][i] = 1;
                f[i] = blo + i;
            } else if(i > blo * 2 && i <= blo * 3) f[i] = i - blo * 2;
            else f[i] = i - blo * 2;
        }
        if(n % 4 == 1) {
            f[n] = n;
            for(int i = blo * 2 + 1; i <= blo * 4; i++) tu[n][i] = tu[i][n] = 1;
        }
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= n; j++) printf("%d", tu[i][j]);
            puts("");
        }
        for(int i = 1; i <= n; i++) {
            if(i != n) printf("%d ", f[i]);
            else printf("%d
", f[i]);
        }
    }
 
    return 0;
}

G

#include <bits/stdc++.h>
using namespace std;
map<int, int> mp;
bool f, ff;
char ss[15];
int s[100005][15];
int n, cnt;
int dp[10005][15][45];
 
bool caile(int y, int m, int d) {
    if(m <= 2) m += 12, y -= 1;
    int c = y / 100;
    y = y - c * 100;
    int w = y + y / 4 + c / 4 - 2 * c + 26 * (m + 1) / 10 + d - 1;
    w %= 7;
    w = (w + 7) % 7;
    if(w == 5) return true;
    return false;
}
 
int l[15], r[15];
int vis[15], to[15];
void dfs(int pos) {
    if(pos > 9) {
        for(int i = 1; i <= cnt; i++) {
            int y = 0, m = 0, d = 0;
            for(int j = 1; j <= 4; j++) y = y * 10 + to[s[i][j]];
            for(int j = 5; j <= 6; j++) m = m * 10 + to[s[i][j]];
            for(int j = 7; j <= 8; j++) d = d * 10 + to[s[i][j]];
            if(y < 1600 || y > 9999 || m > 12 || d > 35) return;
            if(dp[y][m][d] != 5) return;
        }
        ff = true;
        return;
    }
 
    for(int i = l[pos]; i <= r[pos]; i++) {
        if(vis[i] == -1) {
            vis[i] = pos, to[pos] = i;
            dfs(pos + 1);
            if(ff) return;
            vis[i] = -1, to[pos] = -1;
        }
    }
}
 
int mm[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int main() {
    memset(dp, -1, sizeof(dp));
    int now = 0;
    for(int i = 1600; i <= 9999; i++) {
        for(int j = 1; j <= 12; j++) {
            int dd = mm[j];
            if(j == 2)
            if(i % 400 == 0 || ((i % 100 != 0) && (i % 4 == 0))) dd++;
            for(int k = 1; k <= dd; k++) {
                dp[i][j][k] = now;
                now++; now %= 7;
            }
        }
    }
    for(int i = 1600; i <= 9999; i++) {
        for(int j = 1; j <= 12; j++) {
            for(int k = 1; k <=35; k++) {
                if(dp[i][j][k] != -1) {
                    dp[i][j][k] = (dp[i][j][k] - 1 + 7) % 7;
                }
            }
        }
    }
 
    int T;
    scanf("%d", &T);
    int cas = 0;
    while(T--) {
        cnt = 0;
        ff = false;
        f = false;
        mp.clear();
        memset(vis, -1, sizeof(vis));
 
        scanf("%d", &n);
        for(int i = 0; i <= 9; i++) l[i] = 0, r[i] = 9;
        for(int i = 1; i <= n; i++) {
            scanf("%s", ss + 1);
            int now = 0;
            now = now * 10 + (ss[1] - 'A');
            now = now * 10 + (ss[2] - 'A');
            now = now * 10 + (ss[3] - 'A');
            now = now * 10 + (ss[4] - 'A');
            now = now * 10 + (ss[6] - 'A');
            now = now * 10 + (ss[7] - 'A');
            now = now * 10 + (ss[9] - 'A');
            now = now * 10 + (ss[10] - 'A');
            if(mp[now]) continue;
            mp[now] = 1;
            s[++cnt][1] = ss[1] - 'A';
            s[cnt][2] = ss[2] - 'A';
            s[cnt][3] = ss[3] - 'A';
            s[cnt][4] = ss[4] - 'A';
            s[cnt][5] = ss[6] - 'A';
            s[cnt][6] = ss[7] - 'A';
            s[cnt][7] = ss[9] - 'A';
            s[cnt][8] = ss[10] - 'A';
 
            int t1 = ss[1] - 'A';
            l[t1] = max(l[t1], 1);
            int t2 = ss[6] - 'A';
            r[t2] = min(r[t2], 1);
            int t3 = ss[9] - 'A';
            r[t3] = min(r[t3], 3);
        }
 
        dfs(0);
        /*
        if(ff) {
            f = true;
            for(int i = 1; i <= cnt; i++) {
                int y = 0, m = 0, d = 0;
                for(int j = 1; j <= 4; j++) y = y * 10 + to[s[i][j]];
                for(int j = 5; j <= 6; j++) m = m * 10 + to[s[i][j]];
                for(int j = 7; j <= 8; j++) d = d * 10 + to[s[i][j]];
                if(y < 1600 || y > 9999 || m > 12 || d > 31) {
                    f = false;
                    break;
                }
                if(!caile(y, m, d)) {
                    f = false;
                    break;
                }
            }
        }*/
        printf("Case #%d: ", ++cas);
        if(ff) {
            for(int i = 0; i < 10; i++) printf("%d", to[i]);
            puts("");
        } else puts("Impossible");
    } 
   return 0;
}

J

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int n, m;
int c[1005][1005];
int d[1005];
ll sum[1005][1005];
int mb[1005][1005];
 
int main() {
    int T;
    int cas = 0;
    scanf("%d", &T);
    while(T--) {
        cas++;
        scanf("%d%d", &n, &m);
        for(int i = 1; i <= n; i++) {
            sum[i][0] = 0;
            for(int j = 1; j <= m; j++) {
                scanf("%d", &c[i][j]);
                sum[i][j] = sum[i][j - 1] + 1LL * c[i][j];
            }
            mb[i][m] = m;
            for(int j = m - 1; j >= 0; j--) {
                if(sum[i][j] > sum[i][mb[i][j + 1]])
                    mb[i][j] = mb[i][j + 1];
                else mb[i][j] = j;
            }
        }
        d[0] = 0;
        ll ans = 0;
        ll ssum = 0;
        ll tmp = 0;
        for(int i = 1; i <= m; i++) scanf("%d", &d[i]);
        for(int j = 0; j <= m; j++) {
            tmp += 1LL * d[j];
            ssum = 0;
            int cn = 0;
            ll zx = 1e13;
            for(int i = 1; i <= n; i++) {
                int t = mb[i][j];
                ssum += sum[i][t];
                if(t > j) {
                    cn++;
                    zx = min(zx, sum[i][j] - sum[i][t]);
                }
            }
            if(cn == n) ans = max(ans, tmp - ssum - zx);
            else ans = max(ans, tmp - ssum);
        }
        printf("Case #%d: ", cas);
        printf("%lld
", ans);
    }
 
    return 0;
}