oj.uz

답안 #331087

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
331087 2020-11-27T09:58:48 Z Sho10 별들과 삼각형 (IZhO11_triangle) C++14
0 / 100
 1 ms 364 KB 
#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long
#define double long double
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000007
#define PI 3.14159265359
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005ll
#define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n;
pair<ll,ll>a[300005];
map<ll,ll>x,y;
int32_t main(){
CODE_START
cin>>n;
for(ll i=1;i<=n;i++){
    cin>>a[i].f>>a[i].s;
    x[a[i].f]++;
    y[a[i].s]++;
}
ll ans=0;
for(ll i=1;i<=n;i++)
{
    ans+=(x[a[i].f]-1)*(y[a[i].f]-1);
}
cout<<ans<<endl;
}

Subtask #1
0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -