Submission #17447

#	Time	Username	Problem	Language	Result	Execution time	Memory
17447		gs14004	Star triangles (IZhO11_triangle)	C++14	100 / 100	456 ms	7100 KiB

triangle

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <numeric>
#include <deque>
#include <utility>
#include <bitset>
#include <iostream>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;

map<int, int> mx, my;
int n;
pi a[300005];

int main(){
	scanf("%d",&n);
	for(int i=0; i<n; i++){
		scanf("%d %d",&a[i].first, &a[i].second);
		mx[a[i].first]++;
		my[a[i].second]++;
	}
	lint ret = 0;
	for(int i=0; i<n; i++){
		ret += 1ll * (mx[a[i].first]-1) * (my[a[i].second]-1);
	}
	cout << ret;
}

• Subtask 1: 100 / 100