leetcode 88. Merge Sorted Array

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

Note:

• The number of elements initialized in nums1 and nums2are m and n respectively.
• You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2.

Example:

Input:
nums1 = [1,2,3,0,0,0], m = 3
nums2 = [2,5,6],       n = 3

Output: [1,2,2,3,5,6]

 

从后向前归并，将较大的值直接放入nums1的末端。

class Solution {
    public void merge(int[] nums1, int m, int[] nums2, int n) {
        int i = m-1, j = n-1, k = m+n-1;
        while(i>-1 && j>-1) nums1[k--] = (nums1[i] > nums2[j])? nums1[i--]: nums2[j--];
        while(j>-1) nums1[k--] = nums2[j--];
        
    }
}