201509-1 数列分段
水，记下前一个数，看看跟当前是否一样，不一样就ans+1
1 #include <algorithm> 2 #include <iostream> 3 #include <iomanip> 4 #include <cstring> 5 #include <climits> 6 #include <complex> 7 #include <fstream> 8 #include <cassert> 9 #include <cstdio> 10 #include <bitset> 11 #include <vector> 12 #include <deque> 13 #include <queue> 14 #include <stack> 15 #include <ctime> 16 #include <set> 17 #include <map> 18 #include <cmath> 19 20 using namespace std; 21 22 int n, a; 23 24 int main() { 25 // freopen("in", "r", stdin); 26 while(~scanf("%d", &n)) { 27 scanf("%d", &a); 28 int cur = a, cnt = 1; 29 for(int i = 1; i < n; i++) { 30 scanf("%d", &a); 31 if(cur != a) { 32 cnt++; 33 cur = a; 34 } 35 } 36 printf("%d ", cnt); 37 } 38 return 0; 39 }
201509-2 日期计算
打表，注意细节就行
1 #include <algorithm> 2 #include <iostream> 3 #include <iomanip> 4 #include <cstring> 5 #include <climits> 6 #include <complex> 7 #include <fstream> 8 #include <cassert> 9 #include <cstdio> 10 #include <bitset> 11 #include <vector> 12 #include <deque> 13 #include <queue> 14 #include <stack> 15 #include <ctime> 16 #include <set> 17 #include <map> 18 #include <cmath> 19 20 using namespace std; 21 22 const int com[15] = {0,31,59,90,120,151,181,212,243,273,304,334, 365}; 23 const int lep[15] = {0,31,60,91,121,152,182,213,244,274,305,335, 366}; 24 int y, c, m, d; 25 26 int main() { 27 // freopen("in", "r", stdin); 28 while(~scanf("%d %d", &y, &c)) { 29 d = 0; 30 if((y % 4 == 0 && y % 100 != 0) || (y % 400 == 0)) { 31 for(int i = 1; i <= 12; i++) { 32 if(lep[i] < c) { 33 m = i; 34 } 35 else break; 36 } 37 d = c - lep[m]; 38 m++; 39 if(d != 0) printf("%d %d ", m, d); 40 else printf("%d %d ", m, lep[m]-lep[m-1]); 41 } 42 else { 43 for(int i = 1; i <= 12; i++) { 44 if(com[i] < c) { 45 m = i; 46 } 47 else break; 48 } 49 d = c - com[m]; 50 m++; 51 if(d != 0) printf("%d %d ", m, d); 52 else printf("%d %d ", m, com[m]-com[m-1]); 53 } 54 } 55 return 0; 56 }
201509-3 模版生成系统
字符串大模拟，无耻地大量使用了STL，甚至出现了vector<pair<vector<int>,vector<int> > >这样的结构。思路就是首先定位此行输入的字符串的需要替换的变量起止位置，再记录当前字符串。接下来读取模式串的键值，放到set中。接下来替换。要注意使用string中的replace时候会让字符串长度发生变化，这时候只要从末尾开始匹配，最后再输出就行了。
1 #include <algorithm> 2 #include <iostream> 3 #include <iomanip> 4 #include <cstring> 5 #include <climits> 6 #include <complex> 7 #include <fstream> 8 #include <cassert> 9 #include <cstdio> 10 #include <bitset> 11 #include <vector> 12 #include <deque> 13 #include <queue> 14 #include <stack> 15 #include <ctime> 16 #include <set> 17 #include <map> 18 #include <cmath> 19 20 using namespace std; 21 typedef vector<int>::iterator it; 22 typedef vector<vector<int> >::iterator iit; 23 typedef pair<vector<int>,vector<int> > pvv; 24 const int maxn = 111; 25 26 int n, m; 27 vector<int> start, end; 28 vector<pvv> sig; 29 vector<string> str; 30 map<string, string> var; 31 char tmp[maxn]; 32 33 int main() { 34 // freopen("in", "r", stdin); 35 while(~scanf("%d %d", &m, &n)) { 36 sig.clear(); 37 var.clear(); 38 getchar(); 39 for(int i = 0; i < m; i++) { 40 start.clear(); 41 end.clear(); 42 gets(tmp); 43 int len = strlen(tmp); 44 for(int j = 0; j < len; j++) { 45 if(tmp[j] == ' ' && tmp[j-1] == '{' && tmp[j-2] == '{') start.push_back(j+1); 46 if(tmp[j] == ' ' && tmp[j+1] == '}' && tmp[j+2] == '}') end.push_back(j-1); 47 } 48 sig.push_back(pvv(start, end)); 49 str.push_back(string(tmp)); 50 } 51 for(int i = 0; i < n; i++) { 52 gets(tmp); 53 string raw(tmp); 54 int j; 55 for(j = 0; j < raw.length(); j++) { 56 if(raw[j] == ' ') break; 57 } 58 var[raw.substr(0, j)] = raw.substr(j+2, raw.length()-j-3); 59 } 60 for(int i = 0; i < sig.size(); i++) { 61 if(sig[i].first.empty()) { 62 printf("%s ", str[i].c_str()); 63 continue; 64 } 65 for(int j = sig[i].first.size() - 1; j >= 0; j--) { 66 str[i].replace( 67 sig[i].first[j]-3, sig[i].second[j]-sig[i].first[j]+7, 68 var[str[i].substr(sig[i].first[j], sig[i].second[j]-sig[i].first[j]+1)]); 69 // cout << sig[i].first[j] << " " << sig[i].second[j] << endl; 70 // cout << str[i].substr(sig[i].first[j], sig[i].second[j]-sig[i].first[j] + 1) << endl; 71 } 72 printf("%s ", str[i].c_str()); 73 } 74 } 75 return 0; 76 }
201509-4 高速公路
求多少个连通对。先tarjan跑出所有连通分量，然后枚举任意两个不相等的点，看看是否属于同一个连通分量里。
1 #include <algorithm> 2 #include <iostream> 3 #include <iomanip> 4 #include <cstring> 5 #include <climits> 6 #include <complex> 7 #include <fstream> 8 #include <cassert> 9 #include <cstdio> 10 #include <bitset> 11 #include <vector> 12 #include <deque> 13 #include <queue> 14 #include <stack> 15 #include <ctime> 16 #include <set> 17 #include <map> 18 #include <cmath> 19 20 using namespace std; 21 22 const int maxn = 10010; 23 const int maxm = 100010; 24 typedef struct Edge { 25 int u; 26 int v; 27 int next; 28 Edge() { next = -1; } 29 }Edge; 30 31 int head[maxn], ecnt; 32 Edge edge[maxm]; 33 int n, m; 34 35 int bcnt, dindex; 36 int dfn[maxn], low[maxn]; 37 int stk[maxn], top; 38 int belong[maxn]; 39 bool instk[maxn]; 40 41 void init() { 42 memset(edge, 0, sizeof(edge)); 43 memset(head, -1, sizeof(head)); 44 memset(instk, 0, sizeof(instk)); 45 memset(dfn, 0, sizeof(dfn)); 46 memset(low, 0, sizeof(low)); 47 memset(belong, 0, sizeof(belong)); 48 ecnt = top = bcnt = dindex = 0; 49 } 50 51 void adde(int uu, int vv) { 52 edge[ecnt].u = uu; 53 edge[ecnt].v = vv; 54 edge[ecnt].next = head[uu]; 55 head[uu] = ecnt++; 56 } 57 58 void tarjan(int u) { 59 int v = u; 60 dfn[u] = low[u] = ++dindex; 61 stk[++top] = u; 62 instk[u] = 1; 63 for(int i = head[u]; ~i; i=edge[i].next) { 64 v = edge[i].v; 65 if(!dfn[v]) { 66 tarjan(v); 67 low[u] = min(low[u], low[v]); 68 } 69 else if(instk[v] && dfn[v] < low[u]) { 70 low[u] = dfn[v]; 71 } 72 } 73 if(dfn[u] == low[u]) { 74 bcnt++; 75 do { 76 v = stk[top--]; 77 instk[v] = 0; 78 belong[v] = bcnt; 79 } while(v != u); 80 } 81 } 82 83 int main() { 84 // freopen("in", "r", stdin); 85 int uu, vv; 86 while(~scanf("%d %d", &n, &m)) { 87 init(); 88 for(int i = 0; i < m; i++) { 89 scanf("%d %d", &uu, &vv); 90 adde(uu, vv); 91 } 92 for(uu = 1; uu <= n; uu++) { 93 if(!dfn[uu]) { 94 tarjan(uu); 95 } 96 } 97 int ans = 0; 98 for(int i = 1; i <= n; i++) { 99 for(int j = i + 1; j <= n; j++) { 100 if(belong[i] == belong[j]) { 101 ans++; 102 } 103 } 104 } 105 printf("%d ", ans); 106 } 107 return 0; 108 }