제출 #970977

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
970977		saidpon	별들과 삼각형 (IZhO11_triangle)	C++14	0 / 100	0 ms	348 KiB

triangle

#include <bits/stdc++.h>
#define ordered_set tree <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
#define nemeshay ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define allr(pon) pon.rbegin(), pon.rend()
#include <ext/pb_ds/assoc_container.hpp>
#define all(pon) pon.begin(), pon.end()
#include <ext/pb_ds/tree_policy.hpp>
#define pii pair <int, int>
#define nosolve puts("-1")
#define YES puts("YES")
#define pf push_front
#define int long long
#define OK puts("OK")
#define NO puts("NO")
#define pb push_back
#define sigma signed
#define sc second
#define fr first
using namespace __gnu_pbds;
using namespace std;
const int N = 1e6 + 20, INF = 2e9 + 7;
pii a[N];
sigma main(){
    nemeshay
    map <int, int> fir, sec;
    int n, ans = 0;
    cin >> n;
    for (int i = 0; i < n; i++){
        cin >> a[i].fr >> a[i].sc;
        fir[a[i].fr]++;
        sec[a[i].sc]++;
    }
    for (int i = 0; i < n; i++){
        ans += min(fir[a[i].fr], sec[a[i].sc]) - 1;
    }
    cout << ans;
}

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