Submission #1267404

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267404		nekolie	Global Warming (CEOI18_glo)	C++20	100 / 100	43 ms	2888 KiB

glo

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

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,x; cin >> n >> x;
    int a[n], lis[n];
    vector<int> dp;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        if (dp.empty() || a[i]+x > dp.back())
            lis[i] = dp.size();
        else
            lis[i] = (lower_bound(dp.begin(),dp.end(),a[i]+x)-dp.begin());
        if (dp.empty() || a[i] > dp.back())
            dp.push_back(a[i]);
        else
            *lower_bound(dp.begin(),dp.end(),a[i]) = a[i];
    }
    dp.clear();
    for (int i = n-1; i >= 0; i--) {
        if (dp.empty() || -a[i] > dp.back())
            dp.push_back(-a[i]), lis[i] += dp.size();
        else
            *lower_bound(dp.begin(),dp.end(),-a[i]) = -a[i], lis[i] += (lower_bound(dp.begin(),dp.end(),-a[i])-dp.begin())+1;
    }
    cout << *max_element(lis,lis+n) << endl;
    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