Leetcode 27

27. 移除元素

solution : 双指针

class Solution {
    public int removeElement(int[] nums, int val) {
        int size = nums.length;
        int i = 0, j = 0; 
        while (i < size) {  
            if (nums[i] != val) {  
                nums[j] = nums[i];    
                j++; 
            }
            i++;
        }
        return j;
    }
}