Submission #759250

#	Time	Username	Problem	Language	Result	Execution time	Memory
759250		Trunkty	Star triangles (IZhO11_triangle)	C++14	100 / 100	351 ms	30804 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

int n,ans;
vector<vector<int>> v;
map<int,int> row,col;

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for(int i=1;i<=n;i++){
        int a,b;
        cin >> a >> b;
        v.push_back({a,b});
        row[a]++;
        col[b]++;
    }
    for(vector<int> i:v){
        ans += (row[i[0]]-1LL)*(col[i[1]]-1LL);
    }
    cout << ans << "\n";
    return 0;
}

• Subtask 1: 100 / 100