Submission #497668

#	Time	Username	Problem	Language	Result	Execution time	Memory
497668		tmn2005	Star triangles (IZhO11_triangle)	C++17	100 / 100	459 ms	15732 KiB

triangle

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;

#define ar array
#define fr first
#define sc second

#define vec vector
#define ret return

#define ins insert
#define mk make_pair
#define pb push_back
#define pf push_front
#define pob pop_back
#define pof pop_back

#define int long long

#define pii pair<int,int>

#define all(s) s.begin(), s.end()
#define allr(s) s.rbegin(), s.rend()

#define NeedForSpeed ios::sync_with_stdio(0),cin.tie(0);
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
const int N=1e6+12,INF=1e9,mod = 1e9+7;
bool iswowel(char n){ n = toupper(n); if(n == 'A' || n == 'O' || n == 'U' || n == 'E' || n == 'I') return true; else return false;}
int n,m,k,x,y,l,r,o,ans,res,ok,mx,mn = INF;
int a[N],b[N],c[N];

main(){
	NeedForSpeed
	cin>>n;
	
	map<int,int>mpx, mpy;
	for(int i=1; i<=n; i++){
		cin>>a[i]>>b[i];
		mpx[a[i]]++;
		mpy[b[i]]++;
	}
	for(int i=1; i<=n; i++){
		mpx[a[i]]--;
		mpy[b[i]]--;
		
		res += (mpx[a[i]]*mpy[b[i]]);
		
		mpx[a[i]]++;
		mpy[b[i]]++;
	}  
	cout<<res;
}

Compilation message (stderr)

triangle.cpp:34:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   34 | main(){
      | ^~~~

• Subtask 1: 100 / 100