Submission #584062

#	Time	Username	Problem	Language	Result	Execution time	Memory
584062		Kanaifu	Global Warming (CEOI18_glo)	C++17	100 / 100	53 ms	4308 KiB

glo

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define fr first
#define sc second

int arr[200001];
int n, x;
vector <int> sup;
int dp[200001];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cin>>n>>x;

    for (int i=0; i<n; i++)
    {
        cin>>arr[i];
    }
    for (int i=0; i<n; i++)
    {
        auto it = lower_bound(sup.begin(), sup.end(), arr[i]);
        if (it == sup.end())
        {
            sup.pb(arr[i]);
            dp[i] = sup.size();
            continue;
        }
        int pos = it - sup.begin();
        dp[i] = pos + 1;
        sup[pos] = arr[i];
    }
    sup.clear();
    int mx = 0;
    for (int i=n-1; i>=0; i--)
    {
        auto it = lower_bound(sup.begin(), sup.end(), -(arr[i]-x));

        int val = (it-sup.begin());
        val += dp[i];

        mx = max(val, mx);

        it = lower_bound(sup.begin(), sup.end(), -(arr[i]));

        if (it == sup.end())
        {
            sup.pb(-arr[i]);
            continue;
        }
        int pos = it - sup.begin();
        sup[pos] = -arr[i];
    }
    cout<<mx;
}

• 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