leetcode 27. remove elements [time] [memory defeat 100.00% 84.67%] beat

 1  public int removeElement(int[] nums, int val) {
 2         int last = nums.length - 1;
 3         for (int i = 0; i <= last && last >= 0; i++) {
 4             while (last >= 0 && nums[last] == val) last--;
 5             if (last >= 0 && i < last && nums[i] == val) {
 6                 nums[i] = nums[last];
 7                 last--;
 8             }
 9         }
10         return last + 1;
11     }