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P7687 [CEOI2005] Critical Network Lines
https://www.luogu.com.cn/record/102265524
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Luogu/P7687/P7687.cpp
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Luogu/P7687/P7687.cpp
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#include <iostream>
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#include <utility>
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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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const int N = 1e5 + 5;
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int n, m, k, l, a[N], b[N];
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std::vector<int> g[N];
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int dfn[N], low[N];
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bool bridge[N];
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std::vector<std::pair<int, int>> ans;
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void tarjan(int u, int f) {
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static int cnt = 0;
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dfn[u] = low[u] = ++cnt;
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for (int v : g[u]) {
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if (!dfn[v]) {
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tarjan(v, u);
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low[u] = std::min(low[u], low[v]);
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if (dfn[u] < low[v]) {
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if (a[v] == 0 || b[v] == 0 || a[v] == k || b[v] == l) {
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ans.emplace_back(u, v);
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}
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}
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a[u] += a[v];
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b[u] += b[v];
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} else if (v != f) {
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low[u] = std::min(low[u], dfn[v]);
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}
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}
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}
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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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cin >> n >> m >> k >> l;
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for (int i = 1, x; i <= k; i++) {
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cin >> x;
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a[x] = 1;
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}
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for (int i = 1, x; i <= l; i++) {
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cin >> x;
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b[x] = 1;
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}
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for (int i = 1, u, v; i <= m; i++) {
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cin >> u >> v;
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g[u].push_back(v);
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g[v].push_back(u);
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}
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tarjan(1, 1);
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cout << ans.size() << endl;
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for (auto e : ans) {
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cout << e.first << ' ' << e.second << endl;
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}
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return 0;
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}
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