Help me in solving DPOLY problem

help
,
1

My issue

This is my code, the outputs are correct but on submitting it gives wrong answer at task 2. Can someone please point out the error.

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
	// your code goes here
    int tests; cin >> tests;
    while( tests > 0 ){
        tests = tests - 1;
        int num; cin >> num;
        int arr[num]; int l=0;
        for (int i=0; i<num; i++){
            cin >> arr[i];
        }
        for (int i=1;i<num; i++){
            if (arr[i]>arr[i-1]){
                l=i;
            }
            else{
                l=i-1;
            }
        }
        cout << l << endl;
    }
}

Problem Link: Degree of Polynomial Practice Coding Problem - CodeChef

2

@kirti21ag
here plzz refer my c++ code for better understanding of the logic

#include <bits/stdc++.h>
using namespace std;

int main() {
	// your code goes here
	int t;
	cin>>t;
	while(t--)
	{
	    int n;
	    cin>>n;
	    int a[n];
	    for(int i=0;i<n;i++)
	    {
	        cin>>a[i];
	    }
	    for(int i=n-1;i>=0;i--)
	    {
	       if(a[i]!=0)
	       {
	           cout<<i<<endl;
	           break;
	       }
	    }
	}

}