제출 #304150

#제출 시각아이디문제언어결과실행 시간메모리
304150_Ibrohim_별들과 삼각형 (IZhO11_triangle)C++14
100 / 100
579 ms15736 KiB
#include <bits/stdc++.h> #define ll long long #define pb push_back #define fr first #define sc second #define ld long double using namespace std; const ll N = 3e5 + 7; const ll mod = 1e9 + 7; ll n , x[N] , y[N]; map < ll , ll > X , Y; void solve(){ cin >> n; for(int i = 1; i <= n; ++ i){ cin >> x[i] >> y[i]; X[x[i]] ++; Y[y[i]] ++; } ll ans = 0; for(int i = 1; i <= n; ++ i){ X[x[i]] --; Y[y[i]] --; ans += X[x[i]] * Y[y[i]]; X[x[i]] ++; Y[y[i]] ++; } cout << ans; } main(){ /// ****************************** ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); ll tt = 1; /// ****************************** //cin >> tt; while(tt --){ solve(); } return 0; } /** **/

컴파일 시 표준 에러 (stderr) 메시지

triangle.cpp:34:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   34 | main(){
      |      ^
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