Submission #1256104

#	Time	Username	Problem	Language	Result	Execution time	Memory
1256104		rajinnyo	Star triangles (IZhO11_triangle)	C++20	100 / 100	375 ms	23328 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define int long long
// JANGAN LUPA CEK PERLU LL NGGAK
#define pb push_back
#define miku ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pii pair<int,int>
signed main(){
    miku
    int n;cin>>n;
    map<pii,int>xy;
    map<int,int>x,y;
    for(int i=1;i<=n;i++){
        int a,b;cin>>a>>b;
        x[a]++;
        y[b]++;
        xy[{a,b}]++;
    }
    int ans=0;
    for(auto [pxy,val]:xy){
        auto [px,py]=pxy;
        int xx=x[px]-val;
        int yy=y[py]-val;
        int res=xx*yy*val;
        ans+=res;
    }
    cout<<ans;
}





// very mathy 

• Subtask 1: 100 / 100