http://wikioi.com/problem/2833/

拓撲排序，居然1A，哈哈。

#include <cstdio> #include <iostream> #include <algorithm> #include <vector> #include <queue> #include <memory.h> #define MAX(a, b) a>b?a:b #define LEN 105 using namespace std;int main() {int n, m;scanf("%d%d", &n, &m);vector<vector<int> > graph(n+1);vector<int> indegree(n+1);vector<bool> visit(n+1);int ans = n;while (m--) {int x = 0;int y = 0;scanf("%d%d", &x, &y);indegree[y]++;graph[x].push_back(y);}queue<int> que;for (int i = 1; i <= n; i++) {if (indegree[i] == 0) {que.push(i);visit[i] = true;ans--;}}while (!que.empty()) {int node = que.front();que.pop();for (int i = 0; i < graph[node].size(); i++) {if (!visit[graph[node][i]]) {indegree[graph[node][i]]--;if (indegree[graph[node][i]] == 0) {que.push(graph[node][i]);visit[graph[node][i]] = true;ans--;}}}}if (ans == 0) puts("o(∩_∩)o\n");else {puts("T_T\n");printf("%d\n", ans);}return 0; }

　　

轉載于:https://www.cnblogs.com/lautsie/p/3386929.html

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