oj.uz

답안 #995153

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
995153 2024-06-08T14:08:22 Z Sokol080808 별들과 삼각형 (IZhO11_triangle) C++17
0 / 100
 2 ms 344 KB 
#include <bits/stdc++.h>
#include <malloc.h>

using namespace std;

#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifndef ONPC
    freopen("triangles.in", "r", stdin);
    freopen("triangles.out", "w", stdout);
#endif


    int n;
    cin >> n;
    vector<array<int, 2>> a(n);
    map<int, vector<int>> x, y;
    
    for (int i = 0; i < n; i++) {
        cin >> a[i][0] >> a[i][1];
        y[a[i][0]].push_back(a[i][1]);
        x[a[i][1]].push_back(a[i][0]);
    }

    set<int> ok_x, ok_y;
    for (int i = 0; i < n; i++) {
        if (!ok_x.count(a[i][0])) {
            ok_x.insert(a[i][0]);
            sort(all(y[a[i][0]]));
        }
        if (!ok_y.count(a[i][1])) {
            ok_y.insert(a[i][1]);
            sort(all(x[a[i][1]]));
        }
    }

    ll ans = 0;
    for (int i = 0; i < n; i++) {
        auto [curx, cury] = a[i];
        ll u = y[curx].end() - upper_bound(all(y[curx]), cury);
        ll d = lower_bound(all(y[curx]), cury) - y[curx].begin();
        ll l = lower_bound(all(x[cury]), curx) - x[cury].begin();
        ll r = x[cury].end() - upper_bound(all(x[cury]), curx);
        ans += (u + d) * (l + r);
    }
    cout << ans << '\n';

    return 0;
}

Compilation message

triangle.cpp: In function 'int main()':
triangle.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen("triangles.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen("triangles.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -