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Author: dqx-1005

图论/拓扑排序/dfs式拓扑排序.cpp

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+//luogu P1113
+//dfs式拓扑排序 
+
+#include<bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int N = 1e4+5;
+int t[N],f[N];			//时间和答案
+vector<int>edge[N];
+
+int dfs(int x) {
+	if(f[x])return f[x];	//已经被访问过
+	for(int i=0; i<edge[x].size(); i++) {	//循环：x的每条出边指向的点
+		f[x] = max(f[x],dfs(edge[x][i]));	//dp，求pre最大值
+	};
+	f[x]+=t[x];
+	return f[x];
+}
+
+int main() {
+	int n;
+	cin>>n;
+	for(int i=1; i<=n; i++) {
+		int x,y;
+		cin>>x>>t[i];
+		cin>>y;
+		while(y) {
+			edge[y].push_back(x);		//y->x
+			cin>>y;
+		}
+	};
+	int ans = 0;
+	for(int i=1; i<=n; i++)ans = max(ans,dfs(i));
+	cout<<ans;
+	return 0;
+}