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 getbit(i, j) ((i >> j) & 1)
#define maxn 300005
#define name "main"
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
long long GetRandom(long long l, long long r)
{
return uniform_int_distribution<long long> (l, r)(rng);
}
int n,d,a[maxn],st[maxn*4],dp[maxn],dem[maxn],sl,res,lazy[maxn*4],dd[maxn],mod=-1e9;
pair<int,int> b[maxn];
void build(int id,int l,int r)
{
if(l>r) return;
if(l==r)
{
st[id]=mod;
return;
}
int mid=(l+r)/2;
build(id*2,l,mid);
build(id*2+1,mid+1,r);
st[id]=-1e9;
}
void lazy1(int id)
{
int val=lazy[id];
lazy[id]=0;
lazy[id*2]+=val;
lazy[id*2+1]+=val;
st[id*2]+=val;
st[id*2+1]+=val;
return;
}
void updategt(int id,int l,int r,int d,int c,int val)
{
if(l>c||r<d) return;
if(l>=d&&r<=c)
{
st[id]+=val;
lazy[id]+=val;
return;
}
int mid=(l+r)/2;
lazy1(id);
updategt(id*2,l,mid,d,c,val);
updategt(id*2+1,mid+1,r,d,c,val);
st[id]=max(st[id*2],st[id*2+1]);
}
void updatema(int id,int l,int r,int vt,int val)
{
if(l>vt||r<vt) return;
if(l==r)
{
st[id]=max(st[id],val);
return;
}
int mid=(l+r)/2;
lazy1(id);
updatema(id*2,l,mid,vt,val);
updatema(id*2+1,mid+1,r,vt,val);
st[id]=max(st[id*2],st[id*2+1]);
}
int get(int id,int l,int r,int d,int c)
{
if(l>c||r<d) return 0;
if(l>=d&&r<=c) return st[id];
int mid=(l+r)/2;
lazy1(id);
return max(get(id*2,l,mid,d,c),get(id*2+1,mid+1,r,d,c));
}
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
// if(fopen(name".inp","r"))
// {
// freopen(name".inp","r",stdin);
// freopen(name".out","w",stdout);
// }
cin >> n >> d;
for(int i=1;i<=n;i++)
{
cin >> a[i];
b[i]={a[i],i};
}
sort(b+1,b+n+1);
sl=1;
a[b[1].second]=sl;
for(int i=2;i<=n;i++)
{
if(b[i].first>b[i-1].first) sl++;
a[b[i].second]=sl;
}
build(1,1,sl);
int vt=1;
for(int i=1;i<=n;i++)
{
while(vt<i-d)
{
if(dd[a[vt]]==vt)
{
updategt(1,1,sl,a[vt],a[vt],mod);
}
vt++;
}
int val=get(1,1,sl,1,a[i]-1);
dp[i]=max(dp[i],val+1);
// cout<<i<<' '<<dp[i]<<'\n';
res=max(res,dp[i]);
updatema(1,1,sl,a[i],dp[i]);
// if(i==5) cout<<get(1,1,sl,3,3)<<' '<<a[i]<<'\n';
dd[a[i]]=i;
}
cout<<res;
}
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