Majority element

You have been given an array/list 'ARR' consisting of 'N' integers. Your task is to find the majority element in the array. If there is no majority element present, print -1.

Note:

A majority element is an element that occurs more than floor('N' / 2) times in the array.

Input Format:

The first line of input contains an integer 'T' representing the number of test cases.

The first line of each test case contains a single positive integer ‘N’ representing the size of the array/list.

The second line of each test case contains ‘N’ single space-separated integers representing the array elements of 'ARR'.

Output Format :

For each test case, print an integer denoting the majority element present in the array. Print-1 in case of no majority element.

Note :

You don't need to print the output, it has already been taken care of. Just implement the given function.

Constraints:

1 <= T <= 100
1 <= N <= 5 * 10^3
-10^5 <= ARR[i] <= 10^5

Where 'ARR[i]' denotes the element at the 'i'th index in the array/list 'ARR'.

Time limit: 1 sec