Submission #1103979

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103979		vjudge1	Global Warming (CEOI18_glo)	C++17	100 / 100	39 ms	4688 KiB

glo

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int a[200200], dp[200200], l[202100];
void solve() {
    int n, k;
    cin >> n >> k;
    int cnt = 0;
    for (int i = 1;i <= n;i++) {
        cin >> a[i];
        int idx = lower_bound(dp, dp + cnt, a[i]) - dp;
        if (idx == cnt) cnt++;
        dp[idx] = a[i];
        l[i] = idx + 1;
    }
    int mx = cnt;
    cnt = 0;
    for (int i = n;i >= 1;i--) {
        int idx = lower_bound(dp, dp + cnt, -a[i]) - dp;
        mx = max(mx, l[i] + idx);
        idx = lower_bound(dp, dp + cnt, -(a[i] + k)) - dp;
        if (idx == cnt) cnt++;
        dp[idx] = -(a[i] + k);
    }
    cout << mx << '\n';
}

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int q = 1;
    while (q--) {
        solve();
    }
    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