제출 #90123

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
90123		Rashidov_Anis	Star triangles (IZhO11_triangle)	C++14	100 / 100	682 ms	42144 KiB

triangle

#include <bits/stdc++.h>
#define fr first
#define se second
#define sc scanf
#define pf printf
#define ld long double
#define ll long long
#define pb push_back
#define sq(n) n * n
#define r_0 return 0
#define pr pair < ll, ll >
#define prr pair < pair < ll, ll >, ll >
#define fin(s) freopen( s, "r", stdin )
#define fout(s) freopen( s, "w", stdout )
#define TIME ios_base::sync_with_stdio(0)
using namespace std;

const ll INF = 1e9;
const ll N = 3e5 + 3;
const ll mod = 998244353;
const ld eps = 1e-7;

ll n, ans;
pr a[N];
map < ll, ll > mx, my;

main(){
    TIME;
    cin >> n;
    for( int i = 1; i <= n; i ++ ){
        ll x, y;
        cin >> x >> y;
        mx[x]++;
        my[y]++;
        a[i] = { x, y };
    }
    for( int i = 1; i <= n; i ++ ){
        ll x = a[i].fr;
        ll y = a[i].se;
        ll g = mx[x];
        ll h = my[y];
        g--, h--;
        ans += g * h;
    }
    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

triangle.cpp:27:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

• Subtask 1: 100 / 100