Submission #918308

#	Time	Username	Problem	Language	Result	Execution time	Memory
918308		Aiperiii	Global Warming (CEOI18_glo)	C++14	100 / 100	92 ms	10180 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),v2(n+1,1e18);
   vector <int> l(n+1),r(n+1);
   v[0]=-1e18;
   v2[0]=-1e18;
   for(int i=0;i<n;i++){
      auto pos=lower_bound(all(v),a[i])-v.begin();
      l[i]=pos;
      v[pos]=a[i];
   }
   for(int i=n-1;i>=0;i--){
      auto pos=lower_bound(all(v2),-(a[i]-x))-v2.begin();
      r[i]=pos;
      pos=lower_bound(all(v2),-a[i])-v2.begin();
      v2[pos]=-a[i];
   }
   int mx=0;
   for(int i=0;i<n;i++){
      mx=max(mx,l[i]+r[i]-1);
   }
   cout<<mx<<"\n";
}
/*
8 10
7 3 5 12 2 7 3 4
 */

• 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