Submission #1287639

#	Time	Username	Problem	Language	Result	Execution time	Memory
1287639		paulxaxa	Global Warming (CEOI18_glo)	C++17	100 / 100	93 ms	2760 KiB

glo

#include <bits/stdc++.h>



#define NMAX 200000
#define LOG 19
#define ll long long int
#define MOD 30103
#define INF (ll)1e13

using namespace std;

ifstream fin("cod.in");
ofstream fout("cod.out");

int n,x;
int a[NMAX+1];

int dp[NMAX+1];
int mx_dr[NMAX+1];
int main()
{
    cin >> n >> x;
    for(int i=1;i<=n;i++)
    {
        cin >> a[i];
    }
    int l=0;
    for(int i=n;i>=1;i--)
    {
        int st=1,dr=l;
        while(st<=dr)
        {
            int m = (st+dr)/2;
            if(dp[m] > a[i])
            {
                st=m+1;
            }
            else
            {
                dr=m-1;
            }
        }
        if(dr==l)
        {
            dp[++l] = a[i];
        }
        else
        {
            dp[dr+1] = a[i];
        }
        mx_dr[i] = dr+1;
    }
    for(int i=1;i<=n;i++)
    {
        dp[i]=0;
    }
    l=0;
    int res=0;
    for(int i=1;i<=n;i++)
    {
        int st=0,dr=l;
        while(st<=dr)
        {
            int m = (st+dr)/2;
            if(dp[m] < a[i] + x)
            {
                st=m+1;
            }
            else
            {
                dr=m-1;
            }
        }
        res=max(res, dr + mx_dr[i]);
        st=0,dr=l;
        while(st<=dr)
        {
            int m = (st+dr)/2;
            if(dp[m] < a[i])
            {
                st=m+1;
            }
            else
            {
                dr=m-1;
            }
        }
        if(dr==l)
        {
            dp[++l] = a[i];
        }
        else
        {
            dp[dr+1] = a[i];
        }
    }
    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