Submission #736387

#	Time	Username	Problem	Language	Result	Execution time	Memory
736387		study	Global Warming (CEOI18_glo)	C++17	100 / 100	63 ms	8624 KiB

glo

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

const int N = 2e5, inf = 2e9+1;

int a[N], best[N];

int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n,d;
    cin >> n >> d;
    for (int i=0; i<n; ++i){
        cin >> a[i];
    }
    vector<int> dp(N,inf);
    for (int i=0; i<n; ++i){
        best[i] = lower_bound(dp.begin(),dp.end(),a[i]+d)-dp.begin()+1;
        int pos = lower_bound(dp.begin(),dp.end(),a[i])-dp.begin();
        dp[pos] = a[i];
    }
    dp = vector<int>(N,inf);
    int ans = 0;
    for (int i=n-1; i>=0; --i){
        int lds = lower_bound(dp.begin(),dp.end(),-a[i]-d)-dp.begin();
        ans = max(ans,best[i]+lds);
        dp[lds] = -a[i]-d;
    }
    cout << ans;
	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