이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "bits/stdc++.h"
#define f first
#define s second
#define ll int
#define pb push_back
#define pii pair<ll,ll>
#define all(x) x.begin(),x.end()
using namespace std;
const int N=3e5+5;
struct lazy{
ll t[4*N]{0},lz[4*N]{0};
void push(int i,int l,int r){
if(lz[i]){
t[i]=lz[i];
if(l<r){
lz[2*i]=lz[i];
lz[2*i+1]=lz[i];
}lz[i]=0;
}
}
void upd(int i,int l,int r,int tl,int tr,int v){
push(i,l,r);
if(r<tl||l>tr)return;
if(r<=tr&&l>=tl){
lz[i]=v;push(i,l,r);return;
}int m=(l+r)>>1;
upd(2*i,l,m,tl,tr,v);upd(2*i+1,m+1,r,tl,tr,v);
t[i]=max(t[2*i],t[2*i+1]);
}
ll qr(int i,int l,int r,int idx){
push(i,l,r);
if(r<idx||l>idx)return 0;
if(l==r)return t[i];
int m=(l+r)>>1;
return max(qr(2*i,l,m,idx),qr(2*i+1,m+1,r,idx));
}
}lt;
int t[4*N]{0},lz[4*N]{0};
void push(int i,int l,int r){
if(lz[i]){
t[i]=0;
if(l<r){
lz[2*i]=lz[i];
lz[2*i+1]=lz[i];
}lz[i]=0;
}
}
void upd(int i,int l,int r,int tl,int tr){
push(i,l,r);
if(r<tl||l>tr)return;
if(r<=tr&&l>=tl){
lz[i]=1;push(i,l,r);return;
}int m=(l+r)>>1;
upd(2*i,l,m,tl,tr);upd(2*i+1,m+1,r,tl,tr);
t[i]=max(t[2*i],t[2*i+1]);
}
void upd1(int i,int l,int r,int idx,int v){
push(i,l,r);
if(r<idx||l>idx)return;
if(l==r)return void(t[i]=max(t[i],v));
int m=(l+r)>>1;
upd1(2*i,l,m,idx,v);upd1(2*i+1,m+1,r,idx,v);
t[i]=max(t[2*i],t[2*i+1]);
}
ll qr(int i,int l,int r,int tl,int tr){
push(i,l,r);
if(r<tl||l>tr)return 0;
if(r<=tr&&l>=tl)return t[i];
int m=(l+r)>>1;
return max(qr(2*i,l,m,tl,tr),qr(2*i+1,m+1,r,tl,tr));
}
vector<ll>co;
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);
ll n,d;cin>>n>>d;
ll a[n+1];int ans=0;
for(int i=1;i<=n;i++)cin>>a[i],co.pb(a[i]);
sort(all(co));co.erase(unique(all(co)),co.end());int sz=co.size();
for(int i=1;i<=n;i++){
int id = upper_bound(all(co),a[i])-co.begin();
int l=1,r=sz;
while(l<r){
int m=(l+r)>>1;
if(i-lt.qr(1,1,sz,m)>d)l=m+1;
else r=m;
}upd(1,1,sz,1,l-1);
int tmp = qr(1,1,sz,l,id-1)+1;ans=max(tmp,ans);
upd1(1,1,sz,id,tmp);
lt.upd(1,1,sz,id,sz,i);
}cout<<ans;
}
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