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#define PROBLEM "https://judge.yosupo.jp/problem/scc" #include "Template/template.hpp" #include "Graph/scc.hpp" int main(){ int n,m; cin>>n>>m; SCC scc(n); rep(i,0,m){ int x,y; cin>>x>>y; scc.add_edge(x,y); } scc.run(); vector g(scc.m,vector<int>()); rep(i,0,n)g[scc.id[i]].push_back(i); cout<<g.size()<<'\n'; rep(i,0,g.size()){ cout<<g[i].size()<<' '; rep(j,0,g[i].size())cout<<g[i][j]<<(j==(int)g[i].size()-1?'\n':' '); } return 0; }
#line 1 "Verify/LC_scc.test.cpp" #define PROBLEM "https://judge.yosupo.jp/problem/scc" #line 1 "Template/template.hpp" #include <bits/stdc++.h> using namespace std; #define rep(i, a, b) for (int i = (int)(a); i < (int)(b); i++) #define rrep(i, a, b) for (int i = (int)(b-1); i >= (int)(a); i--) #define ALL(v) (v).begin(), (v).end() #define UNIQUE(v) sort(ALL(v)), (v).erase(unique(ALL(v)), (v).end()) #define SZ(v) (int)v.size() #define MIN(v) *min_element(ALL(v)) #define MAX(v) *max_element(ALL(v)) #define LB(v, x) int(lower_bound(ALL(v), (x)) - (v).begin()) #define UB(v, x) int(upper_bound(ALL(v), (x)) - (v).begin()) using uint = unsigned int; using ll = long long int; using ull = unsigned long long; using i128 = __int128_t; using u128 = __uint128_t; const int inf = 0x3fffffff; const ll INF = 0x1fffffffffffffff; template <typename T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return 1; } return 0; } template <typename T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return 1; } return 0; } template <typename T, typename U> T ceil(T x, U y) { assert(y != 0); if (y < 0) x = -x, y = -y; return (x > 0 ? (x + y - 1) / y : x / y); } template <typename T, typename U> T floor(T x, U y) { assert(y != 0); if (y < 0) x = -x, y = -y; return (x > 0 ? x / y : (x - y + 1) / y); } template <typename T> int popcnt(T x) { return __builtin_popcountll(x); } template <typename T> int topbit(T x) { return (x == 0 ? -1 : 63 - __builtin_clzll(x)); } template <typename T> int lowbit(T x) { return (x == 0 ? -1 : __builtin_ctzll(x)); } #ifdef LOCAL #define show(...) _show(0, #__VA_ARGS__, __VA_ARGS__) #else #define show(...) true #endif template <typename T> void _show(int i, T name) { cerr << '\n'; } template <typename T1, typename T2, typename... T3> void _show(int i, const T1 &a, const T2 &b, const T3 &...c) { for (; a[i] != ',' && a[i] != '\0'; i++) cerr << a[i]; cerr << ":" << b << " "; _show(i + 1, a, c...); } template <class T, class U> ostream &operator<<(ostream &os, const pair<T, U> &p) { os << "P(" << p.first << ", " << p.second << ")"; return os; } template <typename T, template <class> class C> ostream &operator<<(ostream &os, const C<T> &v) { os << "["; for (auto d : v) os << d << ", "; os << "]"; return os; } #line 2 "Graph/scc.hpp" struct SCC{ int n,m,cur; vector<vector<int>> g; vector<int> low,ord,id; SCC(int _n=0):n(_n),m(0),cur(0),g(_n),low(_n),ord(_n,-1),id(_n){} void resize(int _n){ n=_n; g.resize(n); low.resize(n); ord.resize(n,-1); id.resize(n); } void add_edge(int u,int v){g[u].emplace_back(v);} void dfs(int v,vector<int>& used){ ord[v]=low[v]=cur++; used.emplace_back(v); for(auto& nxt:g[v]){ if(ord[nxt]==-1){ dfs(nxt,used); chmin(low[v],low[nxt]); } else{ chmin(low[v],ord[nxt]); } } if(ord[v]==low[v]){ while(1){ int add=used.back(); used.pop_back(); ord[add]=n; id[add]=m; if(v==add)break; } m++; } } void run(){ vector<int> used; rep(v,0,n)if(ord[v]==-1)dfs(v,used); for(auto& x:id)x=m-1-x; } }; /** * @brief Strongly Connected Components */ #line 5 "Verify/LC_scc.test.cpp" int main(){ int n,m; cin>>n>>m; SCC scc(n); rep(i,0,m){ int x,y; cin>>x>>y; scc.add_edge(x,y); } scc.run(); vector g(scc.m,vector<int>()); rep(i,0,n)g[scc.id[i]].push_back(i); cout<<g.size()<<'\n'; rep(i,0,g.size()){ cout<<g[i].size()<<' '; rep(j,0,g[i].size())cout<<g[i][j]<<(j==(int)g[i].size()-1?'\n':' '); } return 0; }