Find the Odd Occurence
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  Difficulty: Basic   Marks: 1
Associated Course(s):   Interview Preparation

Given an array of positive integers where all numbers occur even number of times except one number which occurs odd number of times. Find the number.

Input:
The first line of input contains a single integer T denoting the number of test cases. Then T test cases follow. Each test case consist of two lines. The first line of each test case consists of an integer N, where N is the size of array. The second line of each test case contains N space separated integers denoting array elements.

 

Output:
Corresponding to each test case, print the number which occur odd number of times. If no such element exists, print 0.

Constraints:
1 ≤ T ≤ 100
1 ≤ N ≤ 107
1 ≤ A[i] ≤ 106

Example:
Input:
1
5
8 4 4 8 23
Output:
23

Explanation:
Testcase 1: 23 is the element which occurs odd number of times.

** For More Input/Output Examples Use 'Expected Output' option **

Author: rajatjha


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