HDU2094STL

原题http://acm.hdu.edu.cn/showproblem.php?pid=2094

//STL的运用，如果将总的人数减去输的人数，结果等于1，那么就能判断出冠军#include <stdio.h>#include <stdlib.h>#include <malloc.h>#include <limits.h>#include <ctype.h>#include <math.h>#include <string.h>#include <string>#include <algorithm>#include <iostream>#include <stack>#include <queue>#include <deque>#include <map>#include <set>#include <vector>using namespace std;int main(){int n;int i;while(~scanf("%d%*c",&n)){if(n == 0)break;string a;string b;set<string>all;set<string>sum;for(i=0;i<n;i++){cin>>a>>b;all.insert(a);all.insert(b);sum.insert(b);}if(all.size()-sum.size() == 1){printf("Yes\n");}elseprintf("No\n");}return 0;}