Submission #954869

#	Time	Username	Problem	Language	Result	Execution time	Memory
954869		EJIC_B_KEDAX	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	122 ms	15564 KiB

Main

#ifdef LOCAL
    #define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>

#ifndef LOCAL
    #pragma GCC optimize("O3")
    // #pragma GCC optimize("Ofast")
    // #pragma GCC optimize("unroll-loops")
    #pragma GCC target("avx,avx2,bmi,bmi2,popcnt,lzcnt")
#endif
using namespace std;
using ll = long long;
using ld = long double;
#define x first
#define y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

mt19937_64 mt(time(0));

void solve();
void init();

int32_t main() {
#ifndef LOCAL
    cin.tie(nullptr)->sync_with_stdio(false);
#endif
    cout << fixed << setprecision(30);
    init();
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }
}

void init() {}

const int N = 500500;
pair<int, int> a[N];

bool check(int i, int j) {
    return a[i].y - a[j].y >= abs(a[i].x - a[j].x);
}

void solve() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i].x >> a[i].y;
    }
    sort(a, a + n);
    vector<int> st;
    for (int i = 0; i < n; i++) {
        while (!st.empty() && check(i, st.back())) {
            st.pop_back();
        }
        if (st.empty() || !check(st.back(), i)) {
            st.push_back(i);
        }
    }
    cout << st.size() << '\n';
}

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31