Submission #1259567

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259567		vk3601h	Global Warming (CEOI18_glo)	C++20	100 / 100	40 ms	3532 KiB

glo

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

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

    int n, x;
    cin >> n >> x;

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

    int longest = 0;
    vector<int> dp(n, INT_MAX);
    vector<int> pref_longest(n);
    for (int i = 0; i < n; ++i){
        int pos = lower_bound(dp.begin(), dp.end(), temps[i]) - dp.begin();
        dp[pos] = temps[i];
        pref_longest[i] = pos + 1;
        longest = max(longest, pref_longest[i]);
    }

    dp = vector<int> (n, INT_MAX);
    for (int i = n - 1; i >= 0; --i){
        int pos = lower_bound(dp.begin(), dp.end(), -temps[i] + x) - dp.begin();
        longest = max(longest, pref_longest[i] + pos);

        pos = lower_bound(dp.begin(), dp.end(), -temps[i]) - dp.begin();
        dp[pos] = -temps[i];
    }

    cout << longest;
    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