제출 #381531

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
381531		ismoilov	별들과 삼각형 (IZhO11_triangle)	C++14	100 / 100	405 ms	13292 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define IOS ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define all(x) (x).begin(), (x).end()
#define fp(a,i,c) for(int (a) = (i); (a) < (c); (a)++)
#define fpp(a,i,c) for(int (a) = (i); (a) <= (c); (a)++)
#define fm(a,i,c) for(int (a) = (i); (a) > (c); (a)--)
#define fmm(a,i,c) for(int (a) = (i); (a) >= (c); (a)--)
const int MAXX = 3e5+5;
int x[MAXX], y[MAXX];
	map <ll, ll> a, b;
void S()
{
	ll n, ans = 0;
	cin >> n;
	fpp(i,1,n)
	{
		cin >> x[i] >> y[i];
		a[x[i]]++;
		b[y[i]]++;
	}
	fpp(i,1,n)
	{
		ans += 1LL * (a[x[i]]-1)*(b[y[i]]-1);
	}
	cout << ans;
}
int main()
{
	IOS;
	S();
}

컴파일 시 표준 에러 (stderr) 메시지

triangle.cpp: In function 'void S()':
triangle.cpp:7:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    7 | #define fpp(a,i,c) for(int (a) = (i); (a) <= (c); (a)++)
      |                            ^
triangle.cpp:17:2: note: in expansion of macro 'fpp'
   17 |  fpp(i,1,n)
      |  ^~~
triangle.cpp:7:28: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    7 | #define fpp(a,i,c) for(int (a) = (i); (a) <= (c); (a)++)
      |                            ^
triangle.cpp:23:2: note: in expansion of macro 'fpp'
   23 |  fpp(i,1,n)
      |  ^~~

• Subtask 1: 100 / 100