取石子游戏 hdu 1907、2509、 水1846

水：hdu 1846：

#include<cstdio>#include<cstring>#include<stdlib.h>#include<algorithm>#include<iostream>#include<math.h>#include<vector>#include<map>#include<string>using namespace std;#define ll long longint main(){int t;scanf("%d",&t);while(t--){int n,m,k,i,j;scanf("%d%d",&n,&m);if(n%(m+1)!=0)printf("first\n");elseprintf("second\n");}}

http://blog.csdn.net/longshuai0821/article/details/6669777

hdu 1907、2509：

#include<cstdio>#include<cstring>#include<stdlib.h>#include<algorithm>#include<iostream>#include<math.h>#include<vector>using namespace std;#define ll long longint main(){int t;scanf("%d",&t);while(t--){int n,i,j,k;scanf("%d",&n);int ans=0;int sum=0;while(n--){scanf("%d",&k);ans^=k;if(k!=1)sum++;}if(ans==0){if(sum==0)printf("John\n");elseprintf("Brother\n");}else{if(sum==0)printf("Brother\n");elseprintf("John\n");}}}