Create 求无向图的桥(get-bridge).cpp

.ACM-Templates/Graph/求无向图的桥(get-bridge).cpp

@@ -0,0 +1,16 @@
+int dfs[MAXN], low[MAXN], tim = 0;
+inline void Dfs(int u) 
+{
+	dfs[u] = low[u] = ++tim;
+	for (Edge *p = a[u]; p; p = p->next) if (p->flag) {
+		if (!dfs[p->y]) {
+			p->opt->flag = false;
+			Dfs(p->y);
+			low[u] = min(low[u], low[p->y]);
+		} else low[u] = min(low[u], dfs[p->y]);
+	}
+	for (Edge *p = a[u]; p; p = p->next) if (p->opt->flag == false && low[p->y] > dfs[u]) {
+		p->bridge = p->opt->bridge = true;
+	}
+}
+