Submission #1214323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214323		rhm_gan	Global Warming (CEOI18_glo)	C++20	100 / 100	38 ms	2632 KiB

glo

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

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 42
#endif

const int inf = 2e9;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, d;
    cin >> n >> d;

    vector<int> a(n);
    for (int i = 0; i < n; i++) {
    	cin >> a[i];
    }

    vector<int> dp(n + 1, inf);
    dp[0] = -inf;

    vector<int> res(n);
    for (int i = n - 1; i >= 0; i--) {
        int p = lower_bound(dp.begin(), dp.end(), -a[i]) - dp.begin();
        res[i] = p;
        dp[p] = -a[i];
    }

    int ans = 0;
    fill(dp.begin(), dp.end(), inf);
    dp[0] = -inf;

    for (int i = 0; i < n; i++) {
        int x = a[i] + d;
        int p = lower_bound(dp.begin(), dp.end(), x) - dp.begin() - 1;
        ans = max(ans, p + res[i]);
        p = lower_bound(dp.begin(), dp.end(), a[i]) - dp.begin();
        dp[p] = 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