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Submission #499692

# Submission time Handle Problem Language Result Execution time Memory
499692 2021-12-29T09:01:52 Z PoPularPlusPlus Star triangles (IZhO11_triangle) C++17
100 / 100
 182 ms 11244 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long 
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const ll mod = 998244353 ; 
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;
bool remender(ll a , ll b){return a%b;}

bool cmp(pair<int,int> a  ,pair<int,int> b){
	return a.vs < b.vs;
}

void solve(){
	int n;
	cin >> n;
	vector<pair<int,int>> v;
	for(int i = 0; i < n; i++){
		int x , y;
		 cin >> x >> y;
		 v.pb(mp(x,y));
	}
	sort(all(v) , cmp);
	ll ans = 0;
	map<int,ll> m;
	for(int i = 0; i < n; i++){
		ll cnt = 1;
		int j = i + 1;
		while(j < n && v[j].vs == v[i].vs){
			j++;
			cnt++;
		}
		i = j - 1;
		m[v[i].vs] = cnt;
	}
	sv(v);
	
	for(int i = 0; i < n; i++){
		ll cnt = 1;
		int j = i + 1; 
		while(j < n && v[j].vf == v[i].vf){
			j++;
			cnt++;
		}
		for(int k = i; k < j; k++){
			ans += (cnt - 1LL) * (m[v[k].vs]-1LL);
		}
		i = j - 1;
	}
	cout << ans << '\n';
}

int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
//freopen("rblock.in", "r", stdin);
//freopen("rblock.out", "w", stdout);
	//int t;cin >> t;while(t--)
	solve();
	return 0;
}

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 1 ms 312 KB Output is correct
4 Correct 0 ms 312 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 236 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 332 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 324 KB Output is correct
12 Correct 6 ms 1092 KB Output is correct
13 Correct 5 ms 844 KB Output is correct
14 Correct 7 ms 1100 KB Output is correct
15 Correct 62 ms 5076 KB Output is correct
16 Correct 67 ms 5428 KB Output is correct
17 Correct 63 ms 5168 KB Output is correct
18 Correct 67 ms 5112 KB Output is correct
19 Correct 173 ms 10504 KB Output is correct
20 Correct 121 ms 8204 KB Output is correct
21 Correct 182 ms 11168 KB Output is correct
22 Correct 180 ms 11244 KB Output is correct