LeetCode:Merge Sorted Array

Given two sorted integer arrays A and B, merge B into A as one sorted array.

Note:
You may assume that A has enough space (size that is greater or equal to m + n) to hold additional elements from B. The number of elements initialized in A and B are m and n respectively.

思路：从为了不覆盖未比较的元素，后往前比较数组A和B中元素的大小，并从后更新元素。

 

class Solution {
public:
    void merge(int A[], int m, int B[], int n) {
        int i=m-1,j=n-1,k=m+n-1;
        while(i>=0&&j>=0)
        {
            if(A[i]>B[j])
                A[k--]=A[i--];
            else
                A[k--]=B[j--];
        }
        while(j>=0)
            A[k--]=B[j--];
    }
};