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Leetcode

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 nums2 are 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]

KeyPoint

  1. 注意代码的取值意义, 边界条件.
  2. 注意某些边界条件的case.

Solution1:

通过使用双指针, 从尾部开始遍历, 可以不借助辅助空间来完成一次遍历.