Majority Element
Basic Accuracy: 39.96% Submissions: 100k+ Points: 1

Given an array A of N elements. Find the majority element in the array. A majority element in an array A of size N is an element that appears more than N/2 times in the array.

Input:  
The first line of the input contains T denoting the number of testcases. The first line of the test case will be the size of array and second line will be the elements of the array.

Output: 
For each test case the output will be the majority element of the array. Output "-1" if no majority element is there in the array.

Constraints:
1 <= T<= 100
1 <= N <= 107
0 <= Ai <= 106

Example:
Input:
2
5
3 1 3 3 2
3
1 2 3

Output:
3
-1

Explanation:
Testcase 1: Since, 3 is present more than N/2 times, so it is the majority element.

 

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