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解题思路:
裸的匈牙利算法,看最大匹配是否等于P;
#include <iostream> #include <cstring> #include <cstdlib> #include <cstdio> #include <vector> #include <algorithm> using namespace std; const int MAXN = 500; int p, n; int G[MAXN][MAXN]; int match[MAXN]; int vis[MAXN]; int path(int u) { for(int i=1;i<=p;i++) { if(G[u][i] && !vis[i]) { vis[i] = 1; if(match[i] == -1 || path(match[i])) { match[i] = u; return 1; } } } return 0; } int main() { int T; scanf("%d", &T); while(T--) { memset(G, 0, sizeof(G)); memset(vis, 0, sizeof(vis)); memset(match, -1, sizeof(match)); scanf("%d%d", &p, &n); int c; for(int i=1;i<=p;i++) { scanf("%d", &c); while(c--) { int x; scanf("%d", &x); G[x][i] = 1; } } int ans = 0; for(int i=1;i<=n;i++) { memset(vis, 0, sizeof(vis)); ans += path(i); } if(ans == p) printf("YES\n"); else printf("NO\n"); } return 0; }
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原文地址:http://blog.csdn.net/moguxiaozhe/article/details/44746571