Submission #436027

#	Time	Username	Problem	Language	Result	Execution time	Memory
436027		ak2006	Star triangles (IZhO11_triangle)	C++14	100 / 100	517 ms	26208 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vc = vector<char>;
using vvc = vector<vc>;
using vs = vector<string>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
    fast;
}
int main()
{
    setIO();
    int n;
    cin>>n;
    vvi p(n,vi(2));
    map<int,int>x,y;
    for (int i = 0;i<n;i++)cin>>p[i][0]>>p[i][1],x[p[i][0]]++,y[p[i][1]]++;
    ll ans = 0;
    for (int i = 0;i<n;i++)
        ans += 1ll * (x[p[i][0]] - 1) * 1ll * (y[p[i][1]] - 1);
    cout<<ans;
    return 0;
}

• Subtask 1: 100 / 100