Submission #390771

#	Time	Username	Problem	Language	Result	Execution time	Memory
390771		SirCovidThe19th	Global Warming (CEOI18_glo)	C++14	100 / 100	130 ms	5352 KiB

glo

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

int main() {
	//days, max decrement
    int n, x;
    cin >> n >> x;
    int days[n];
    for (int i = 0; i < n; i++)
        cin >> days[i];
    
    int pref[n];
    int suff[n];

    int dp[n];
    fill(dp, dp+n, 1000000007);
    for (int i = 0; i < n; i++){
        int pos = lower_bound(dp, dp+n, days[i])-dp;
        dp[pos] = days[i];
        pref[i] = pos+1;
    }
    fill(dp, dp+n, 1000000007);
    for (int i = n-1; i >= 0; i--){
        int pos = lower_bound(dp, dp+n, -(days[i]-x))-dp;
        suff[i] = pos+1;
        pos = lower_bound(dp, dp+n, -days[i])-dp;
        dp[pos] = -days[i];
    }
    int ans = 0;
    for (int i = 0; i < n; i++){
        ans = max(ans, pref[i]+suff[i]-1);
    }
    cout<<ans<<endl;
}

• 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