Write a code to find the first non-repeating element in a given array arr of N integers.
Note: Array consists of only positive and negative integers and not zero.
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Example 1:
Input: arr [] = {-1, 2, -1, 3, 2}
Output: 3
Explanation: -1 and 2 are repeating whereas 3 is the only number occurring once. Hence, the output is 3.
Example 2:
Input: arr [] = {1, 1, 1}
Output: 0
Note : (you can use any languages like JAVA, HTML/CSS/JS, Python, C/C++ or other)