Submission #1291084

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291084		Gadir_2880	Star triangles (IZhO11_triangle)	C++20	100 / 100	346 ms	28040 KiB

triangle

//The Rumbling starts here:

#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include<bits/stdc++.h>
#define debug(n,m) cout<<"["<<#n<<"]->"<<n<<m
#define int long long
#define all(x) x.begin(),x.end() 
#define ai array<int,2>
#define vv vector
#define pb push_back
using namespace std;

const int N=3132352;
const int mod=1e9+7;
const int inf=(1ll<<55)-1;

int x[N],y[N];

void levi() {
  //#define tests
  int n;
  cin>>n;
  map<int,int> mpx;
  map<int,int> mpy;
  set<array<int,2>> s;
  for (int i=1;i<=n;i++) {
    cin>>x[i]>>y[i];
    s.insert({x[i],y[i]});
    // mpx[y[i]]++;
    // mpy[x[i]]++;
  }
  for (auto [i,j] : s) {
    mpx[i]++;
    mpy[j]++;
  }
  int res=0;
  for (auto [i,j]:s) {
    int k1=mpx[i]-1;
    int k2=mpy[j]-1;
    // debug(k1,' ');
    // debug(k2,'\n');
    res+=k1*k2;
  }
  cout<<res<<'\n';
}


int32_t main() {
  //freopen("input.in","r",stdin);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int tt=1;
  #ifdef tests
  cin>>tt;
  #endif
  while(tt--) levi();
}

• Subtask 1: 100 / 100