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View the Project on GitHub SSRS-cp/cp_library
#define PROBLEM "https://judge.yosupo.jp/problem/scc" #include <bits/stdc++.h> using namespace std; #include "../../../graph/strongly_connected_components.hpp" int main(){ int N, M; cin >> N >> M; vector<vector<int>> E(N); for (int i = 0; i < M; i++){ int a, b; cin >> a >> b; E[a].push_back(b); } strongly_connected_components G(E); int K = G.cnt; vector<vector<int>> v(K); for (int i = 0; i < N; i++){ v[G[i]].push_back(i); } cout << K << endl; for (int i = 0; i < K; i++){ int l = v[i].size(); cout << l; for (int j = 0; j < l; j++){ cout << ' ' << v[i][j]; } cout << endl; } }
#line 1 "test/library_checker/graph/scc.test.cpp" #define PROBLEM "https://judge.yosupo.jp/problem/scc" #include <bits/stdc++.h> using namespace std; #line 2 "graph/strongly_connected_components.hpp" /** * @brief 強連結成分分解 */ struct strongly_connected_components{ vector<int> scc; int cnt = 0; void dfs1(vector<vector<int>> &E, vector<int> &t, vector<bool> &used, int v){ for (int w : E[v]){ if (!used[w]){ used[w] = true; dfs1(E, t, used, w); } } t.push_back(v); } void dfs2(vector<vector<int>> &E2, vector<bool> &used2, int v){ scc[v] = cnt; for (int w : E2[v]){ if (!used2[w]){ used2[w] = true; dfs2(E2, used2, w); } } } strongly_connected_components(vector<vector<int>> &E){ int N = E.size(); vector<vector<int>> E2(N); for (int i = 0; i < N; i++){ for (int j : E[i]){ E2[j].push_back(i); } } vector<int> t; vector<bool> used(N, false); for (int i = 0; i < N; i++){ if (!used[i]){ used[i] = true; dfs1(E, t, used, i); } } reverse(t.begin(), t.end()); vector<bool> used2(N, false); scc = vector<int>(N); for (int i = 0; i < N; i++){ if (!used2[t[i]]){ used2[t[i]] = true; dfs2(E2, used2, t[i]); cnt++; } } } int operator [](int k){ return scc[k]; } }; #line 5 "test/library_checker/graph/scc.test.cpp" int main(){ int N, M; cin >> N >> M; vector<vector<int>> E(N); for (int i = 0; i < M; i++){ int a, b; cin >> a >> b; E[a].push_back(b); } strongly_connected_components G(E); int K = G.cnt; vector<vector<int>> v(K); for (int i = 0; i < N; i++){ v[G[i]].push_back(i); } cout << K << endl; for (int i = 0; i < K; i++){ int l = v[i].size(); cout << l; for (int j = 0; j < l; j++){ cout << ' ' << v[i][j]; } cout << endl; } }