제출 #598767

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
598767		sumit_kk10	Star triangles (IZhO11_triangle)	C++17	100 / 100	347 ms	15568 KiB

triangle

#include<bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
#define pb push_back
#define F first
#define S second
#define int long long
using namespace std;
const int N = 1e6 + 5, MOD = 1e9 + 7;
int n, x[N], y[N];

void solve(){
    cin >> n;
    map<int, int> cmp, cmp1;
    for(int i = 0; i < n; ++i){
        cin >> x[i] >> y[i];
        cmp[y[i]]++;
        cmp1[x[i]]++;
    }
    int ans = 0;
    for(int i = 0; i < n; ++i)
        ans += (cmp[y[i]] - 1) * (cmp1[x[i]] - 1);
    cout << ans << '\n';
}

int32_t main(){
    fast;
    int t = 1;
    // cin >> t;
    while(t--)
        solve();
    return 0;
}

• Subtask 1: 100 / 100