Submission #651266

#	Time	Username	Problem	Language	Result	Execution time	Memory
651266		dilaylay_dilaylaylay	Star triangles (IZhO11_triangle)	C++17	0 / 100	2 ms	340 KiB

triangle

#include <iostream>
#include <bits/stdc++.h>    
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>

#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")

using namespace std;

#define int long long
#define ll long long
#define vi vector<long long>
#define pb push_back
#define sz(s) (int)s.size()
#define all(v) v.begin(), v.end()
#define show(a) cerr << #a <<" -> "<< a <<"\n"
#define pp pair<int,int>
#define FF first
#define SS second
#define endl "\n"

const int N = 1e6 + 2, N3 = 1e3 + 6, inf = 1e9 + 7, LOG = 20;
map<char, int> md{{'N', 0}, {'E', 1}, {'S', 2}, {'W', 3}};
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
string stepDir = "RDLU";

int n, x[N], y[N], ans	;
map<int, int> cnt, cnt2;

main () {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);	
	
	freopen("triangles.in", "r", stdin);
	freopen("triangles.out", "w", stdout);
	
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> x[i] >> y[i];
		cnt[x[i]]++;
		cnt2[y[i]]++;
	}
	
	for (int i = 1; i <= n; i++) {
		ans += (cnt[x[i]] - 1) * (cnt2[y[i]] - 1);
	}
	
	cout << ans;
		
	return 0;
}

Compilation message (stderr)

triangle.cpp:13: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
   13 | #pragma comment(linker, "/stack:200000000")
      | 
triangle.cpp:40:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   40 | main () {
      | ^~~~
triangle.cpp: In function 'int main()':
triangle.cpp:45:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |  freopen("triangles.in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:46:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |  freopen("triangles.out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 100