Submission #1318152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1318152		kawhiet	Global Warming (CEOI18_glo)	C++20	100 / 100	44 ms	2780 KiB

glo

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

constexpr int inf = 2e9;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, x;
    cin >> n >> x;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    vector<int> dp(n, inf), p(n);
    for (int i = 0; i < n; i++) {
        int j = ranges::lower_bound(dp, a[i]) - dp.begin();
        dp[j] = a[i];
        p[i] = j + 1;
    }
    ranges::fill(dp, inf);
    int ans = ranges::max(p);
    for (int i = n - 1; i >= 0; i--) {
        int pos = ranges::lower_bound(dp, -a[i] + x) - dp.begin();
        ans = max(ans, p[i] + pos);
        int j = ranges::lower_bound(dp, -a[i]) - dp.begin();
        dp[j] = -a[i];
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25