/*input 1 3 2 1 2 2 3 */ #include <bits/stdc++.h> using namespace std; typedef unsigned long long int ull; typedef long long ll; typedef pair<int,int> ii; typedef vector<int> vi; typedef vector<ii> vii; #define rep(i,a,n) for (int i=a;i<n;i++) #define per(i,a,n) for (int i=n-1;i>=a;i--) #define all(x) (x).begin(),(x).end() #define sz(x) ((int)(x).size()) #define pb push_back #define mp make_pair #define pq priority_queue #define fi first #define se second #define INF 0x3f3f3f3f #define NEGINF 0xC0C0C0C0 #define LINF 0x3f3f3f3f3f3f3f3fLL #define EPS 1e-10 #define PI 2 * acos(0) #define NULO -1 #define endl '\n' const ll mod=1000000007; ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;} int cmp(double x, double y = 0, double tol = EPS){ return (x <= y + tol) ? (x + tol < y) ? -1 : 0 : 1; } int n,m; vector<vi> adj,adjt; vi num,s; void k(int u, int pass){ num[u]=1; vi ni; if(pass==1) ni=adj[u]; else ni=adjt[u]; rep(i,0,ni.size()){ int v=ni[i]; if(num[v]==-1) k(v,pass); } s.pb(u); } int main(){ int t,a,b; scanf("%d",&t); while(t--){ scanf("%d %d",&n,&m); adj.assign(n,vi()); adjt.assign(n,vi()); rep(i,0,m){ scanf("%d %d",&a,&b); a--;b--; adj[b].pb(a); adjt[a].pb(b); } s.clear(); num.assign(n,-1); rep(i,0,n) if(num[i]==-1) k(i,1); int numscc=0; num.assign(n,-1); //reverse(s.begin(),s.end()); rep(i,0,n) if(num[s[i]]==-1){ //printf("%d",i ); numscc++; k(s[i],2); } printf("%d\n",numscc); } return 0; }
Standard input is empty
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