# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
929083 | haru09 | Global Warming (CEOI18_glo) | C++17 | 120 ms | 6472 KiB |
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;
#define ll long long
#define fi first
#define se second
#define task "code"
const int ar=2e5+5;
const ll mod=1e9+7;
int n,x;
int a[ar];
int l[ar],r[ar];
vector<int> v;
int pos(int val)
{
return lower_bound(v.begin(),v.end(),val)-v.begin()+1;
}
int bit[ar];
void update(int u,int v)
{
int id=u;
while(id<=n)
{
bit[id]=max(bit[id],v);
id+=id&(-id);
}
}
int get(int p)
{
int id=p;
int ans=0;
while(id>0)
{
ans=max(ans,bit[id]);
id-=id&(-id);
}
return ans;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
if (fopen(task".inp","r"))
{
freopen(task".inp","r",stdin);
freopen(task".out","w",stdout);
}
cin>>n>>x;
for (int i=1;i<=n;i++)
{
cin>>a[i];
v.push_back(a[i]);
}
sort(v.begin(),v.end());
for (int i=1;i<=n;i++)
{
int p=pos(a[i]);
int dp=get(p-1)+1;
update(p,dp);
l[i]=dp;
}
for (int i=1;i<=n;i++) bit[i]=0;
for (int i=n;i>=1;i--)
{
int p=n-pos(a[i]-x+1)+1;
r[i]=get(p);
p=n-pos(a[i])+1;
int dp=get(p-1)+1;
update(p,dp);
}
int ans=0;
for (int i=1;i<=n;i++) ans=max(ans,l[i]+r[i]);
cout<<ans;
}
Compilation message (stderr)
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