LeetCode 27. Remove Element题目分析代码

public class Solution {
    /** 
     *@param A: A list of integers
     *@param elem: An integer
     *@return: The new length after remove
     */
    public int removeElement(int[] A, int elem) {
        // write your code here
        int fast=0,slow=0;  
        int n=A.length;  
        int ret=0;  
          
        while(fast<n){  
            if(A[fast]!=elem){  
                ++ret;  
                A[slow]=A[fast];  
                ++slow;  
            }  
            ++fast;  
        }  
        return ret;
    }
}