Remove Element

删掉一列数中等于elem的所有数，返回新数组的个数

难度：1

看代码吧。。特别容易特别短

class Solution {
public:
    int removeElement(int A[], int n, int elem) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        int len=n;
        for(int i=n-1;i>=0;i--)
        {
            if(A[i] == elem)
            {
                swap(A[len-1],A[i]);
                len--;
            }
        }
        return len;
    }
};