Remove Element

Remove Element

问题：

Given an array and a value, remove all instances of that value in place and return the new length.

The order of elements can be changed. It doesn't matter what you leave beyond the new length.

思路：

　　典型双指针+交换

我的代码：

public class Solution {
    public int removeElement(int[] A, int elem) {
        if(A == null || A.length == 0)  return 0;
        int cur = 0;
        int right = A.length - 1;
        while(cur <= right)
        {
            if(A[cur] == elem)
            {
                int swap = A[right];
                A[right] = A[cur];
                A[cur] = swap;
                right--;
            }
            else
            {
                cur ++;
            }
        }
        return cur;
    }
}