289. Remove Element

Given an integer array nums and an integer val, remove all occurrences of val in nums in-place. Return the number of elements in nums which are not equal to val. The relative order of elements may be changed.

Example:
Input: nums = [3,2,2,3], val = 3
Output: 2
Explanation: nums becomes [2,2,_,_] and we return 2

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