Remove Element

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.

注：这道题使用了简单选择排序的思想。将数组从头开始向后遍历，当发现A[i]==elem时，将该数组最后一个位置的元素进行交换（最后一个位置随着删除元素，不断的变化）。

public class Solution {

    public int removeElement(int[] A, int elem) {
        
        int len = A.length-1;
        int i = 0;
        int temp;
        while(i <= len){
            if(A[i] == elem){
                temp = A[len];
                A[len] = A[i];
                A[i] =temp;
                --len;
            }
            else{
                i++;
            }
        }
        return len+1;
    }


}