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Submission #499047

# Submission time Handle Problem Language Result Execution time Memory
499047 2021-12-27T06:27:58 Z ac2hu Star triangles (IZhO11_triangle) C++14
100 / 100
 118 ms 3188 KB 
#include<bits/stdc++.h>
using namespace std;
const int maxn = 3e5 + 10;
int comp1[maxn];
int comp2[maxn];
signed main(){
	iostream::sync_with_stdio(false);
	cin.tie(nullptr);cout.tie(nullptr);
	int n;cin >> n;
	vector<pair<int,int>> stars(n);
	for(int i = 0;i<n;i++){
		cin >> stars[i].first >> stars[i].second;
	}
	sort(stars.begin(),stars.end());
	int c = 0;
	int k = stars[0].first;
	stars[0].first = 0;
	for(int i = 1;i<n;i++){
		if(stars[i].first != k){
			c++;
			k = stars[i].first;
		}
		stars[i].first = c;
	}
	sort(stars.begin(),stars.end(),[&](pair<int,int> a,pair<int,int> b){
		return a.second < b.second;
	});
	c = 0;
	k = stars[0].second;
	stars[0].second = 0;
	for(int i = 1;i<n;i++){
		if(stars[i].second != k){
			c++;
			k = stars[i].second;
		}
		stars[i].second = c;
	}	
	for(int i = 0;i<n;i++){
		comp1[stars[i].first]++;
		comp2[stars[i].second]++;
	}
	long long int ans = 0;
	for(int i = 0;i<n;i++){
		ans += 1ll*(comp1[stars[i].first] - 1)*(comp2[stars[i].second] - 1);
	}
	cout << ans << "\n";
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 324 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 320 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 3 ms 588 KB Output is correct
13 Correct 3 ms 644 KB Output is correct
14 Correct 4 ms 584 KB Output is correct
15 Correct 36 ms 1604 KB Output is correct
16 Correct 46 ms 1664 KB Output is correct
17 Correct 38 ms 1512 KB Output is correct
18 Correct 39 ms 1504 KB Output is correct
19 Correct 99 ms 2900 KB Output is correct
20 Correct 75 ms 2412 KB Output is correct
21 Correct 118 ms 3188 KB Output is correct
22 Correct 112 ms 3188 KB Output is correct