'commit'

TangDou/AcWing/ErFenTu/POJ3041.cpp

@@ -0,0 +1,46 @@
+#include <cstdio>
+#include <cstring>
+using namespace std;
+const int N = 550;
+
+int g[N][N]; // 地图
+int n, m;
+
+// 匈牙利
+int st[N], match[N];
+int dfs(int u) {
+    for (int i = 1; i <= n; i++) {
+        if (g[u][i] && !st[i]) { // u->i有边
+            st[i] = 1;
+            if (match[i] == -1 || dfs(match[i])) {
+                match[i] = u;
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+int main() {
+#ifndef ONa_JUDGE
+    freopen("POJ3041.in", "r", stdin);
+#endif
+    memset(g, 0, sizeof g);
+    memset(match, -1, sizeof match);
+    scanf("%d%d", &n, &m);
+
+    while (m--) {
+        int x, y;
+        scanf("%d%d", &x, &y);
+        g[x][y] = 1;
+    }
+
+    // 匈牙利
+    int res = 0;
+    for (int i = 1; i <= n; i++) {
+        memset(st, 0, sizeof st);
+        if (dfs(i)) res++;
+    }
+    // 输出
+    printf("%d\n", res);
+    return 0;
+}