Problem #15: Group elements of an array based on their first occurrence (Hashing)Given an unsorted integer array containing many duplicate elements, rearrange it such that the same element appears together and the relative order of the first occurrence of each element remains unchanged. For example:Input: 1, 2, 3, 1, 2, 1Output: 1, 1, 1, 2, 2, 3Input: 5, 4, 5, 5, 3, 1, 2, 2, 4Output: 5, 5, 5, 4, 4, 3, 1, 2, 2
Problem #15: Group elements of an array based on their first occurren…
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