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HDU 1285 确定比赛名次【拓扑排序】链式向前星+优先队列
阅读量:369 次
发布时间:2019-03-04

本文共 1609 字,大约阅读时间需要 5 分钟。

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    #include 
    #include
    #include
    #include
    #include
    using namespace std;int main() { int n, m; while (true) { cin >> n >> m; if (m == 0) break; vector
    in(n + 1, 0); vector
    head(n + 1); vector
    > adj(n + 1); int cnt = 0; for (int i = 1; i <= m; ++i) { int p1, p2; cin >> p1 >> p2; adj[p1].push_back(p2); in[p2]++; } // Initialize the priority queue priority_queue
    , greater
    > q; for (int i = 1; i <= n; ++i) { if (in[i] == 0) q.push(i); } vector
    ans; while (!q.empty()) { int u = q.top(); q.pop(); ans.push_back(u); for (int v : adj[u]) { in[v]--; if (in[v] == 0) q.push(v); } } // Output the result if (ans.size() != n) { // This should not happen as per the problem statement cout << "Error" << endl; } else { for (int i = 0; i < ans.size(); ++i) { if (i > 0) cout << " "; cout << ans[i]; } } } return 0;}

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