My code is running on local compiler but here it gives run error(NOTE: this is the main program I did include all the main files while writing it)

#1

bool nextpermutation(int arr[],int n)
{

if(n==1)
	return false;
	
int i=n-2;

while(i>=0 && arr[i]>arr[i+1])
{
    i--;
}

if(i==0)
   return false;

else
{
    auto it=upper_bound(arr+i,arr+n,arr[i]);
    int index=it-arr;
    swap(arr[i],arr[index]);
    reverse(arr+i+1,arr+n);
    return true;
}

}

void printarray(int arr[],int n)
{
for(int i=0;i<n;i++)
{
cout<<arr[i]<<" “;
}
cout<<”\n";
}

int main()
{
int t;
cin>>t;
while(t–)
{
int n;
cin>>n;

    int *arr=new int[n];
    for(int i=0;i<n;i++)
    {
        cin>>arr[i];
    }


    if(nextpermutation(arr,n))
    {
        printarray(arr,n);
    }

    else
    {
        sort(arr,arr+n);
        printarray(arr,n);
    }
}

}

#2

the problem is in this line:
if(i==0)
return false;

this should be:
if(i==-1)
return false;

thanks

#3

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