Submission #491566

#	Time	Username	Problem	Language	Result	Execution time	Memory
491566		osmanallazov	Star triangles (IZhO11_triangle)	C++14	100 / 100	514 ms	13168 KiB

triangle

#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main(){
    ll n,x,y;
    ll res=0;
    map<ll,ll>m,p;
    cin>>n;
    int a[n],b[n];
    for(int i=0;i<n;i++){
        cin>>a[i]>>b[i];
        m[a[i]]++;
        p[b[i]]++;
    }
    for(int i=0;i<n;i++){
        res+=((m[a[i]]-1)*(p[b[i]]-1));
    }
    cout<<res;
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:5:10: warning: unused variable 'x' [-Wunused-variable]
    5 |     ll n,x,y;
      |          ^
triangle.cpp:5:12: warning: unused variable 'y' [-Wunused-variable]
    5 |     ll n,x,y;
      |            ^

• Subtask 1: 100 / 100