Maximum length Biotonic Not Working!

#1

Given test cases are passing but getting wrong answer on submitting
#include
#include
#define ll long long
using namespace std;
int main() {
ll t,n;
cin>>t;
while(t–)
{
cin>>n;
vector arr(n);
for(ll i=0;i<n;i++)cin>>arr[i];
vector left(n,1),right(n,1);
for(ll i=1;i<n;i++)
{
if(arr[i]>=arr[i-1])
{
left[i]=left[i-1]+1;
}
else
left[i]=left[i-1];
}
for(ll i=n-2;i>=0;i–)
{
if(arr[i]>=arr[i+1])
{
right[i]=right[i+1]+1;
}
else
right[i]=right[i+1];
}
ll ans=left[0]+right[0]-1;
for(ll i=1;i<n;i++)
ans=max(ans,left[i]+right[i]-1);
cout<<ans<<"\n";
}
return 0;
}

#2

save your code on the online ide

#3

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