이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <iostream>
#include <vector>
using namespace std;
typedef long long int ll;
ll N,M;
ll x,y;
ll P,ans;
bool V[100005];
vector<ll> grafo[300005];
void DFS(int k){
if(V[k])
return;
P++;
V[k]=true;
for(int f:grafo[k])
DFS(f);
}
int main(){
cin>>N>>M;
for(int i=0;i<M;i++){
cin>>x>>y;
grafo[x].push_back(y);
grafo[y].push_back(x);
}
for(int i=1;i<N+1;i++)
if(!V[i]){
P=0;
DFS(i);
ans+=(P*(P-1)*(P-2))/3;
}
cout<<ans;
}
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