Submission #1097094

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097094		Niosakaru	Global Warming (CEOI18_glo)	C++17	100 / 100	44 ms	4700 KiB

glo

#include <bits/stdc++.h>

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

#define N 200200
int n , x , rt , p , b[N] , a[N] , lis[N];

signed main(){
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> x , memset(b , 0x3f , sizeof b);
    for (int i = 1 ; i <= n ; i ++)
        cin >> a[i] , p = lower_bound(b + 1,b + n + 1,a[i]) - b , rt = max(rt,p) , lis[i] = p , b[p] = a[i];
    memset(b , 0x3f , sizeof b);
    for (int i = n ; i ; i --){
        p = lower_bound(b + 1,b + n + 1,-a[i]) - b;
        rt = max(rt , p + lis[i] - 1);
        p = lower_bound(b + 1,b + n + 1,-a[i]-x) - b , b[p] = -a[i]-x;
    }

    cout << rt << '\n';

    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