http://poj.org/problem?id=2425 #include <vector> #include <iostream> using namespace std; vector<int> edges[1000]; int N,M,GS[1000],ans; int DFS(int n) /* 典型求 SG 函数的办法 */ { if(GS[n]!=-1) return GS[n]; bool used[1000]; memset(used,0,sizeof(used)); for(int i=0;i<edges[n].size();i++) { used[DFS(edges[n][i])]=true; } int i=0; while(used[i]) i++; return GS[n]=i; } int main() { int num,next; while(scanf("%d",&N)!=EOF) { for(int i=0;i<N;i++) { edges[i].clear(); scanf("%d",&num); for(int j=0;j<num;j++) { scanf("%d",&next); edges[i].push_back(next); } } memset(GS,-1,sizeof(GS)); while(scanf("%d",&M)&&M) { ans=0; for(int i=0;i<M;i++) scanf("%d",&next),ans^=DFS(next); if(ans) printf("WINn"); else printf("LOSEn"); } } return 0; }
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