Submission #1263969

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263969		nikaa123	Star triangles (IZhO11_triangle)	C++20	0 / 100	0 ms	328 KiB

triangle

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

// #define int long long
#define eb emplace_back
#define mp make_pair
#define pb push_back
#define pp pop_back
#define endl '\n'
#define ff first
#define ss second
#define stop exit(0)
#define sz(x) (int)x.size()
#define pause system("pause")
#define all(x) (x).begin(), (x).end()
#define deb(x) cout << #x << "-" << x << endl

typedef char chr;
typedef string str;
typedef long long ll;
typedef vector<int> vii;
typedef pair<int, int> pii;

const long long INF = LLONG_MAX;
const int inf = INT_MAX;
const int mod = 998244353;
const int MOD = 1e9 + 7;
const int dx[] = {0, 0, -1, 1};
const int dy[] = {-1, 1, 0, 0};
const double PI = 2 * acos(0.0);

const int N = 3e5 + 5;

int n;
int x[N],y[N];
int X[2*N],Y[2*N];
int ans;

inline void test_case() {
    
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> x[i] >> y[i];
        X[x[i]+N]++;
        Y[y[i]+N]++;
    }
    for (int i = 1; i <= n; i++) {
        ans += (X[x[i]+N]-1)*(Y[y[i]+N]-1);
    }
    cout << ans << endl;


}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    int T = 1;
    // cin >> T;
    while (T--) {
        test_case();
    }
    return 0;
}

• Subtask 1: 0 / 100