This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
const int maxn=300000+10;
int all[maxn],n,d,kaf=(1<<19);
vector<pair<int,int>>v;
bool cmp(pair<int,int>a,pair<int,int>b){
if(a.first==b.first){
return a.second>b.second;
}
return a.first<b.first;
}
struct segmenta{
long long seg[(1<<20)];
segmenta(){
for(int i=0;i<(1<<20);i++){
seg[i]=1;
}
}
void upd(int i,int l,int r,int tl,int tr){
if(l>r||l>tr||r<tl||tl>tr||seg[i]==0){
return ;
}
if(l>=tl&&r<=tr){
seg[i]=0;
return ;
}
int m=(l+r)>>1;
upd((i<<1),l,m,tl,tr);
upd((i<<1)^1,m+1,r,tl,tr);
seg[i]=seg[(i<<1)]|seg[(i<<1)^1];
return ;
}
int pors(int i,int l,int r,int tl,int tr){
if(l>r||l>tr||r<tl||tl>tr||seg[i]==0){
return 0;
}
if(l==r){
return l;
}
int m=(l+r)>>1;
int ret=pors((i<<1)^1,m+1,r,tl,tr);
if(ret==0){
return pors((i<<1),l,m,tl,tr);
}
return ret;
}
}seg1;
struct segment{
long long seg[(1<<20)];
void ins(int i,long long w){
while(i>0){
seg[i]=max(seg[i],w);
i>>=1;
}
}
int pors(int i,int l,int r,int tl,int tr){
if(l>r||l>tr||r<tl||tl>tr){
return 0;
}
if(l>=tl&&r<=tr){
return seg[i];
}
int m=(l+r)>>1;
return max(pors((i<<1),l,m,tl,tr),pors((i<<1)^1,m+1,r,tl,tr));
}
}seg;
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n>>d;
for(int i=1;i<=n;i++){
cin>>all[i];
v.push_back(make_pair(all[i],i));
}
sort(v.begin(),v.end(),cmp);
for(int i=0;i<n;i++){
int ind=v[i].second;
seg1.upd(1,0,kaf-1,ind-d+1,ind);
int l=seg1.pors(1,0,kaf-1,0,ind-1);
int res=seg.pors(1,0,kaf-1,l,ind-1)+1;
seg.ins(ind+kaf,res);
}
// for(int i=1;i<=n;i++){
// cout<<i<<" "<<seg.pors(1,0,kaf-1,i,i)<<endl;
// }
cout<<seg.pors(1,0,kaf-1,1,n)<<endl;
}
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