LeetCode Remove Element

1.题目

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.

2.解决方案

class Solution {
public:
    int removeElement(int A[], int n, int elem) {
         for(int i = 0; i < n; i++){  
            if(A[i] == elem){  
                swap(A[i],A[n-1]);  
                --n;  
                --i;  
            }  
        }  
        return n;  
    }
};

思路：题目的意思比较简单就是数组中删除一些元素，跟输入的值一样，然后返回数组长度。一般情况下数组中删除一个元素，后面的全部元素都要往前