Submission #846470

#	Time	Username	Problem	Language	Result	Execution time	Memory
846470		fanwen	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	128 ms	15440 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define MASK(x) (1LL << (x))
#define BIT(x, i) (((x) >> (i)) & 1)
#define ALL(x) (x).begin(), (x).end()
#define REP(i, n) for (int i = 0, _n = n; i < _n; ++i)
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (a), _b = (b); i >= _b; --i)
#define FORE(i, a, b) for (int i = (a), _b = (b); i < _b; ++i)
#define debug(...) "[" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
#define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }

template <class A, class B> bool minimize(A &a, B b)  { if (a > b) { a = b; return true; } return false; }
template <class A, class B> bool maximize(A &a, B b)  { if (a < b) { a = b; return true; } return false; }

const int MAXN = 5e5 + 5;

int N;
pair <int, int> a[MAXN];

void you_make_it(void) {
    cin >> N;
    FOR(i, 1, N) cin >> a[i].first >> a[i].second;
    sort(a + 1, a + N + 1);
    stack <int> st;
    FOR(i, 1, N) {
        if(!st.empty() && a[i].first - a[st.top()].first <= a[st.top()].second - a[i].second) {
            continue;
        }
        while(!st.empty() && a[i].first - a[st.top()].first <= a[i].second - a[st.top()].second) {
            st.pop();
        }
        st.push(i);
    }
    cout << st.size();
}

signed main() {

#ifdef LOCAL
    freopen("TASK.inp", "r", stdin);
    freopen("TASK.out", "w", stdout);
#endif
    auto start_time = chrono::steady_clock::now();

    cin.tie(0), cout.tie(0) -> sync_with_stdio(0);

    you_make_it();

    auto end_time = chrono::steady_clock::now();

    cerr << "\nExecution time : " << chrono::duration_cast <chrono::milliseconds> (end_time - start_time).count() << "[ms]" << endl;

    return (0 ^ 0);
}

// Dream it. Wish it. Do it.

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