BZOJ [ZJOI2007]矩阵游戏 (二分图匹配)

最新推荐文章于 2021-08-02 20:58:50 发布

原创最新推荐文章于 2021-08-02 20:58:50 发布 · 248 阅读

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#include <bits/stdc++.h>
using namespace std;
const int nmax = 250;
const int INF = 0x3f3f3f3f;
typedef long long ll;
typedef double db;
int t, n, cy[nmax];
bool mp[nmax][nmax];
bool visit[nmax];
bool findpath(int x) {
    for (int i = 1; i <= n; ++i) {
        if (mp[x][i] && !visit[i]) {
            visit[i] = true;
            if (!cy[i] || findpath(cy[i])) {
                cy[i] = x;
                return true;
            }
        }
    }
    return false;
}
bool matchmax() {
    for (int i = 1; i <= n; ++i) {
        memset(visit, 0, sizeof visit);
        if (!findpath(i)) return 0;
    }
    return 1;
}
int main() {
    scanf("%d", &t);
    while (t--) {
        scanf("%d", &n);
        memset(cy, 0, sizeof(cy));
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= n; ++j) {
                scanf("%d", &mp[i][j]);
            }
        }
        if (matchmax()) printf("Yes\n");
        else printf("No\n");
    }
    return 0;
}