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1059. [ZJOI2007]矩阵游戏
https://hydro.ac/d/bzoj/record/63b5630e291ec3514f4c4113
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BZOJ/1059/1059.cpp
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58
BZOJ/1059/1059.cpp
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#include <iostream>
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#include <functional>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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int t;
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cin >> t;
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while (t--) {
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int n;
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cin >> n;
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int ans = 0;
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std::vector<int> tag(n, -1), match(n, -1);
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std::vector<std::vector<int>> g(n);
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for (int i = 0; i < n; i++) {
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for (int j = 0, x; j < n; j++) {
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cin >> x;
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if (x) g[i].emplace_back(j);
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}
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}
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std::function<bool(int, int)> dfs = [&](int u, int t) {
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if (tag[u] == t) return false;
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tag[u] = t;
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for (int v : g[u]) {
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if (match[v] == -1 || dfs(match[v], t)) {
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match[v] = u;
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return true;
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}
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}
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return false;
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};
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for (int i = 0; i < n; i++) {
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if (dfs(i, i)) ans++;
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}
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cout << (ans == n ? "Yes" : "No") << endl;
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}
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return 0;
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}
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