LeetCode 移除元素

Given an integer array nums and an integer val, remove all occurrences of val in nums in-place. The relative order of the elements may be changed.

func removeElement(nums []int, val int) int {
    left := 0
    for _, v := range nums { // v 即 nums[right]
        if v != val {
            nums[left] = v
            left++
        }
    }
    return left
}