Submission #1111974

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111974		KK_1729	Star triangles (IZhO11_triangle)	C++17	100 / 100	292 ms	20656 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define pb push_back
#define all(a) a.begin(), a.end()
#define endl "\n"

void printVector(vector<int> a){
    for (auto x: a) cout << x << " ";
    cout << endl;
}

void solve(){
    int n; cin >> n;
    map<int, int> abc;
    map<int, int> oord;

    vector<pair<int, int>> points;
    FOR(i,0,n){
        int x, y; cin >> x >> y;
        points.pb({x, y});
        abc[x]++;
        oord[y]++;
    }
    int ans = 0;
    for (auto point: points){
        ans += (abc[point.first]-1)*(oord[point.second]-1);
    }
    cout << ans << endl;
}
int32_t main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);
    int t = 1; // cin >> t;
    while (t--) solve();
}

• Subtask 1: 100 / 100