Remove Element 解答

 1 public class Solution {
 2     public int removeElement(int[] nums, int val) {
 3         int length = nums.length;
 4         if (length == 0)
 5             return 0;
 6         if (length == 1) {
 7             if (nums[0] == val)
 8                 return 0;
 9             else
10                 return 1;
11         }
12         int p1 = -1, p2 = 0;
13         while (p2 < length) {
14             if (nums[p2] != val) {
15                 p1++;
16                 nums[p1] = nums[p2];
17                 p2++;
18             } else {
19                 p2++;
20             }
21         }
22         return p1 + 1;
23     }
24 }