Submission #977200

#	Time	Username	Problem	Language	Result	Execution time	Memory
977200		suhu88	Star triangles (IZhO11_triangle)	C++14	0 / 100	2059 ms	6740 KiB

triangle

#include<bits/stdc++.h>
#define suhu ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define fi first
#define se second
#define pb push_back
using namespace std;
typedef long long ll;
const ll MAXN=3e5+5;
const ll inf=1e18;
ll n,a[MAXN],b[MAXN];
int main(){
	suhu
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i];
	}
	
	ll ans=0;
	for(int i=1;i<=n;i++){
		ll x=0,y=0;
		for(int j=1;j<=n;j++){
			if(j==i)continue;
			if(a[i]==a[j])x++;
			if(b[i]==b[j])y++;
		}
		ans+=x*y;
	}
	cout<<ans<<"\n";
	return 0;
}

• Subtask 1: 0 / 100