Submission #1010238

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010238		ByeWorld	Star triangles (IZhO11_triangle)	C++14	100 / 100	407 ms	15604 KiB

triangle

#include <bits/stdc++.h>
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
#define int long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii, int> ipii;
const int MAXN = 3e5+10;
const int MAXA = 2e3+10;
const int INF = 1e18+10;
const int LOG = 19;
const int MOD = 1e9+7;
const int SQRT = 450;
const vector<int> NOL = {};
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const vector<int> dx = {1, -1, 0, 0};
const vector<int> dy = {0, 0, 1, -1};

int n;
int x[MAXN], y[MAXN];
map <int, int> p, q;

signed main(){
    // ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    for(int i=1; i<=n; i++){
        cin >> x[i] >> y[i];
        p[x[i]]++; q[y[i]]++;
    }
    int ans = 0;
    for(int i=1; i<=n; i++){
        ans += (p[x[i]]-1) * (q[y[i]]-1);
    }
    cout << ans << '\n';
}

• Subtask 1: 100 / 100