oj.uz

Submission #671593

# Submission time Handle Problem Language Result Execution time Memory
671593 2022-12-13T09:10:22 Z Baytoro Star triangles (IZhO11_triangle) C++17
100 / 100
 300 ms 12600 KB 
#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define int long long
#define endl '\n'
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}
const int INF=1e9+9,mod=1e9+7;
int n,m;
void solve(){
	cin>>n;
	map<int,int> x,y;
	vector<pair<int,int>> vec;
	for(int i=0;i<n;i++){
		int a,b;cin>>a>>b;
		vec.pb({a,b});
		x[a]++,y[b]++;
	}
	int res=0;
	for(int i=0;i<n;i++){
		res+=(x[vec[i].fr]-1)*(y[vec[i].sc]-1);
	}
	cout<<res;
}
main(){
	ios;
	int T=1;
	//cin>>T;
	while(T--){
		solve();
	}
}

Compilation message

triangle.cpp:32:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   32 | main(){
      | ^~~~
triangle.cpp: In function 'void fopn(std::string)':
triangle.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 6 ms 1104 KB Output is correct
13 Correct 6 ms 1108 KB Output is correct
14 Correct 9 ms 1532 KB Output is correct
15 Correct 106 ms 5820 KB Output is correct
16 Correct 104 ms 5944 KB Output is correct
17 Correct 95 ms 5912 KB Output is correct
18 Correct 97 ms 5836 KB Output is correct
19 Correct 270 ms 12556 KB Output is correct
20 Correct 191 ms 8352 KB Output is correct
21 Correct 300 ms 12516 KB Output is correct
22 Correct 294 ms 12600 KB Output is correct