Submission #635991

#	Time	Username	Problem	Language	Result	Execution time	Memory
635991		ahmed_shafik	Star triangles (IZhO11_triangle)	C++17	100 / 100	379 ms	15596 KiB

triangle

#include <bits/stdc++.h>
#define ahmed_is_fast             \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define ll long long
#define ld long double
#define cc(n) cout << n << "\n"
#define ccc(n) cout << n << ' '
#define endl "\n"
#define all(v) v.begin(), v.end()
#define mx(a, b) a = max(a, b)
#define mn(a, b) a = min(a, b)
#define mem(a, b) memset(a, b, sizeof(a))
#define f(a) a.first
#define s(a) a.second
#define lcm(a, b) (a * b) / __gcd(a, b)
#define sp(x) setprecision(x)
using namespace std;
const ll mx=21;
void ahmed()
{
    ll n;
    cin>>n;
    ll x[n+9],y[n+9];
    map<ll,ll>mx,my;
    for(ll i=0; i<n; i++)
    {
        cin>>x[i]>>y[i];
        mx[x[i]]++;
        my[y[i]]++;    
    }
    ll ans=0;
    for(ll i=0; i<n; i++)
    {
        ans += (ll) (mx[x[i]] - 1) * (my[y[i]] - 1);
    }
    cout<<ans<<endl;
}
bool AHMED = false;
int main()
{
    ahmed_is_fast;
    ll t = 1;
    if (AHMED)
    {
        cin >> t;
    }
    while (t--)
    {
        ahmed();
    }
    return 0;
}

• Subtask 1: 100 / 100