Submission #881882

#	Time	Username	Problem	Language	Result	Execution time	Memory
881882		vjudge1	별들과 삼각형 (IZhO11_triangle)	C++17	100 / 100	242 ms	9332 KiB

triangle

#ifndef Local
    #pragma GCC optimize("O3,unroll-loops")
    const int lim=2e5+100;
#else
    const int lim=3e3;
#endif

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

#define int long long
#define pb push_back

const int mod=1e9+7;
using pii=pair<int,int>;

void solve(){
    int n;
    cin>>n;
    pii a[n];
    map<int,int>col,row;
    for(int i=0;i<n;i++){
        cin>>a[i].first>>a[i].second;
        col[a[i].first]++,row[a[i].second]++;
    }
    sort(a,a+n);
    int ans=0;
    for(int i=0;i<n;i++){
        ans+=(col[a[i].first]-1)*(row[a[i].second]-1);
    }
    cout<<ans<<"\n";
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
#ifdef Local  
    freopen(".in","r",stdin);
    freopen(".out","w",stdout);
#else
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
#endif
    int t=1;
    //cin>>t;
    while (t--)
    {
        solve();
    }
}

• Subtask 1: 100 / 100