Next-permutation problem doubt

#1

#include
#include
using namespace std;
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];
}

  next_permutation(arr,arr+n);
  			for(int i = 0 ; i <n ; i ++) {
		cout<<arr[i]<<" ";
	}	
  	cout<<endl;
}

return 0;

}
when i submit this code it gave me wrong answer but i didn’t get it why

#3

hey @keshavgupta0103 your code is working fine, on being given the input
1
5
1 2 3 4 5
it return
1 2 3 5 4
which is the next permuation.

#4

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#5

#include
using namespace std;
#include
int main()
{
int t,n;

cin>>t;
while(t--)
{
	int a[1000];
	
	cin>>n;
	
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
	}
	next_permutation(a,a+n);
	

for(int i=0;i<n;i++)
{
	cout<<a[i]<<"  ";
}
}

}

why is this code not pass any test case ?