Submission #1326622

#	Time	Username	Problem	Language	Result	Execution time	Memory
1326622		jadai007	Global Warming (CEOI18_glo)	C++17	100 / 100	39 ms	2484 KiB

glo

#include <bits/stdc++.h>

using namespace std;

int n, x, it, a[200200], dp[200200], ans;
vector<int> lis;

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> x;
    for(int i = 1; i <= n; ++i){
        cin >> a[i];
        it = lower_bound(lis.begin(), lis.end(), a[i]) - lis.begin();
        if(it == lis.size()) lis.push_back(a[i]);
        else lis[it] = a[i];
        dp[i] = it + 1;
        ans = max(ans, dp[i]);
    }
    lis.clear();
    for(int i = n; i > 0; --i){
        it = lower_bound(lis.begin(), lis.end(), -a[i] + x) - lis.begin();
        ans = max(ans, it + dp[i]);
        it = lower_bound(lis.begin(), lis.end(), -a[i]) - lis.begin();
        if(it == lis.size()) lis.push_back(-a[i]);
        else lis[it] = -a[i];
    }
    cout << ans;
}

• 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