Submission #940033

#	Time	Username	Problem	Language	Result	Execution time	Memory
940033		vjudge1	Global Warming (CEOI18_glo)	C++17	100 / 100	97 ms	6688 KiB

glo

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n,x;
    cin>>n>>x;
    vector <int> a(n);
    for(int i=0;i<n;i++)cin>>a[i];
    vector <int> v(n+1,1e18);
    v[0]=-1e18;
    vector <int> l(n),r(n);
    for(int i=0;i<n;i++){
        auto it=lower_bound(all(v),a[i]);
        int pos=it-v.begin();
        v[pos]=a[i];
        l[i]=pos;
    }
    for(int i=0;i<n;i++)a[i]*=-1;
    for(int i=1;i<=n;i++)v[i]=1e18;
    
    for(int i=n-1;i>=0;i--){
        auto it=lower_bound(all(v),a[i]+x);
        int pos=it-v.begin();
        r[i]=pos;
        it=lower_bound(all(v),a[i]);
        pos=it-v.begin();
        v[pos]=a[i];
    }
    int mx=0;
    for(int i=0;i<n;i++){
        mx=max(mx,l[i]+r[i]-1);
    }
    cout<<mx<<"\n";
}
/*
 4
 1 2200 700
 1 1800 10
 1 2550 9999
 1 2000 750
 3
 1 1500 300
 1 1900 1500
 1 2400 4550
*/
           
 
           

• 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