Submission #946519

#	Time	Username	Problem	Language	Result	Execution time	Memory
946519		sondos225	Star triangles (IZhO11_triangle)	C++17	100 / 100	255 ms	15516 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define yes "YES"
#define no "NO"
#define bigg INT_MAX
#define debug(x) cout<<(#x)<<" = " <<x<<endl;
#define all(x) x.begin(),x.end()
#define sz size()
#define nn '\n'
#define mms(x,y) memset(x,y,sizeof(x))
#define forr(i,j,n) for (int i=j; i<n; i++)
#define forn(i,j,n) for (int i=j; i>n; i--)
#define fi first
#define se second
#define la "LA"
#define cinn(x,y) for(int i=0; i<y; i++) cin>>x[i];
#define pii pair<int,int>
signed main()
{
//    #ifndef LOCAL
//    freopen("lifeguards.in","r",stdin);
//    freopen("lifeguards.out","w", stdout);
//    #endif
    fast
    int n;
    cin>>n;
    pii a[n];
    map<int,int> mx;
    map<int,int> my;
    forr(i,0,n)
    {
        cin>>a[i].fi >>a[i].se;
        mx[a[i].fi]++;
        my[a[i].se]++;
    }
    int ans=0;
    forr(i,0,n)
    {
        ans+=((mx[a[i].fi]-1)*(my[a[i].se]-1));
       // cin>>a[i].fi >>a[i].se;
       // ++;
       // ++;
    }
    cout<<ans;
    return 0;
}

• Subtask 1: 100 / 100