Submission #568762

#	Time	Username	Problem	Language	Result	Execution time	Memory
568762		inluminas	Duathlon (APIO18_duathlon)	C++17	0 / 100	25 ms	3156 KiB

count_triplets

#include"bits/stdc++.h"
using namespace std;

#define ll long long
#define endl "\n"
#define fastio ios_base::sync_with_stdio(false)
#define inf LLONG_MAX
#define l first
#define r second

const ll lmt=1e5+10;
ll sz[lmt],par[lmt];
bool vis[lmt];

ll findpar(ll u){
	if(par[u]==u) return u;
	return par[u]=findpar(par[u]);
}

void merge(ll u,ll v){
	u=findpar(u),v=findpar(v);
	if(u==v) return;
	par[u]=v;
	sz[v]+=sz[u];
	return;
}

int main(){
	fastio;

	ll n,m;
	cin>>n>>m;
	for(ll i=1;i<=n;i++){
		par[i]=i,sz[i]=1;
	}
	for(ll i=1;i<=m;i++){
		ll u,v;
		cin>>u>>v;
		merge(u,v);
	}

	ll ans=0;

	for(ll i=1;i<=n;i++){
		ll p=findpar(i);
		if(vis[p]) continue;
		vis[p]=1;
		ll val=sz[p];
		if(val<3) continue;
		ans+=(val*(val-1)*(val-2));
	}

	cout<<ans<<endl;
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 11
• Subtask 3: 0 / 8
• Subtask 4: 0 / 10
• Subtask 5: 0 / 13
• Subtask 6: 0 / 15
• Subtask 7: 0 / 20
• Subtask 8: 0 / 8
• Subtask 9: 0 / 10