Submission #744566

#	Time	Username	Problem	Language	Result	Execution time	Memory
744566		ajab_01	Global Warming (CEOI18_glo)	C++17	10 / 100	69 ms	13176 KiB

glo

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

#define int long long

const int N = 2e5 + 5;
const int INF = 1e9 + 1000;
int arr[N] , dp[N] , las[N] , last[N] , g[N] , f[N] , ls[N] , ans , n , x;

int32_t main(){
	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	fill(las , las + N , INF);
	fill(last , last + N , INF);
	fill(ls , ls + N , INF);
	cin >> n >> x;
	for(int i = 0 ; i < n ; i++)
		cin >> arr[i];
	for(int i = 0 ; i < n ; i++){
		int low = 0 , high = n;
		while(high - low > 1){
			int mid = (high + low) >> 1;
			if(las[mid] < arr[i])
				low = mid;
			else
				high = mid;
		}

		las[low + 1] = arr[i];
		dp[i] = low + 1;

		int l = 0 , r = n;
		while(r - l > 1){
			int mid = (r + l) >> 1;
			if(last[mid] < arr[i])
				l = mid;
			else
				r = mid;
		}

		g[i] = l + 1;
		last[low + 1] = arr[i] - x;
	}

	for(int i = 0 ; i < n ; i++){
		int low = 0 , high = n;
		while(high - low > 1){
			int mid = (high + low) >> 1;
			if(ls[mid] < arr[i])
				low = mid;
			else
				high = mid;
		}

		f[i] = low + 1;
		f[i] = max(f[i] , g[i]);
		ls[f[i]] = arr[i];
		ans = max(ans , f[i]);
	}

	cout << ans << '\n';
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25