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| /* | |
| Given an array of integers, find the first repeating element in it. | |
| We need to find the element that occurs more than once and whose index of first occurrence is smallest. | |
| Example 1: | |
| - Input: arr = {10, 5, 3, 4, 3, 5, 6} | |
| - Output: 5 | |
| Example 2: | |
| - Input: arr = {6, 10, 5, 4, 9, 120, 4, 6, 10} | |
| - Output: 6 | |
| */ | |
| void main() { | |
| } |
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