Submission #976393

#	Time	Username	Problem	Language	Result	Execution time	Memory
976393		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	273 ms	9232 KiB

triangle

#include <bits/stdc++.h>
#define bismillah ios_base::sync_with_stdio(0); cin.tie(0);
#define int 		  long long
#define v 			  vector
#define pb 			  push_back
#define ppb 		  pop_back
#define all(x)    x.begin(), x.end()
#define rall(x)   x.begin(), x.end()
#define pii 		  pair<int, int>
#define pll 		  pair<long long, long long>
#define fi 			  first
#define se 			  second
#define mp 			  make_pair
#define lb 			  lower_bound
#define ub 			  upper_bound
#define endl 		  '\n'
#define tc 			  int t = 1; while (t--)
// #define tc 			  int t; cin >> t; while (t--)
const int MOD = 1e9 + 7;
const int INF = 1e17;
using namespace std;

signed main(){
	bismillah;
	tc {
		//input
		int n; cin >> n;
		map<int, int> mpx, mpy;
		int coordX[n + 1], coordY[n + 1];
		for (int i = 0; i < n; i++) {
			int x, y;
			cin >> x >> y;
			
			mpx[x]++; mpy[y]++;
			coordX[i] = x;
			coordY[i] = y;
		}
		
		//solve
		int ans = 0;
		for (int i = 0; i < n; i++) {
			ans += (mpx[coordX[i]] - 1) * (mpy[coordY[i]] - 1);
		}
		
		//output
		cout << ans << endl;
	}
}

• Subtask 1: 100 / 100