Submission #969138

#	Time	Username	Problem	Language	Result	Execution time	Memory
969138		vjudge1	Global Warming (CEOI18_glo)	C++17	100 / 100	46 ms	4696 KiB

glo

#include<bits/stdc++.h>
#define pb	emplace_back
#define long long ll;
using namespace std;
typedef pair<int,int> ii;
const int N = 2e5 + 5;
int n , x , a[N];
int prefix[N];
int b[N];
int main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin >> n >> x;
    for(int i = 1 ; i <= n ; i++)
        cin >> a[i];
    int m = 0;
    for(int i = 1 ; i <= n ; i++)
    {
        int k = lower_bound(b + 1 , b + m + 1 , a[i]) - b;
        b[k] = a[i];
        m = max(m , k);
        prefix[i] = k;
    }
    int res = 0;
    m = 0;
    for(int i = n ; i >= 1 ; --i)
    {
        res = max(res , min(m , int(lower_bound(b + 1 , b + m + 1 , a[i] , greater<int>()) - b) - 1) + prefix[i]);
        int k = lower_bound(b + 1 , b + m + 1 , a[i] + x , greater<int>()) - b;
        b[k] = a[i] + x;
        m = max(m , k);
    }
    cout << res;
}

• 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