Submission #316763

#	Time	Username	Problem	Language	Result	Execution time	Memory
316763		LifeHappen__	Global Warming (CEOI18_glo)	C++14	100 / 100	63 ms	4216 KiB

glo

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define forinc(a,b,c) for(int a=b, _c=c; a<=_c; ++a)
#define fordec(a,b,c) for(int a=b, _c=c; a>=_c; --a)
#define forv(a,b) for(auto &a:b)
#define fasty ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define ar array
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define all(a) begin(a),end(a)
#define reset(f,x) memset(f,x,sizeof(f))
#define bit(x,i) (x>>(i-1)&1ll)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1ll<<(i-1)))

const int N=2e5+5;
int n,x,a[N],b[N],pf[N],m;

int32_t main(){
   fasty;

   cin>>n>>x;
   forinc(i,1,n) cin>>a[i];
   forinc(i,1,n){
      int k=lower_bound(b+1, b+m+1, a[i])-b;
      b[k]=a[i];
      m=max(m,k);
      pf[i]=k;
   }
   int ans=0; m=0;
   fordec(i,n,1){
      ans=max(ans, (int)(lower_bound(b+1, b+m+1, a[i], greater<int>())-b-1)+pf[i]);
      int k=lower_bound(b+1, b+m+1, a[i]+x, greater<int>())-b;
      b[k]=a[i]+x;
      m=max(m,k);
   }
   cout<<ans<<'\n';
}

• 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