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]
难度:easy
题目:
给定两个有序整数数组nums1 和 nums2, 合并两数组。
注意:
nums1和nums2是单独实例化的两个数组长度为m和n。假定nums1拥有足够的空间(大于m+n)来存放nums2中的所有元素。
思路:从后向前处理
Runtime: 2 ms, faster than 100.00% of Java online submissions for Merge Sorted Array.
Memory Usage: 26.4 MB, less than 93.33% of Java online submissions for Merge Sorted Array.
class Solution { public void merge(int[] nums1, int m, int[] nums2, int n) { int end = m + n - 1; int ml = m - 1, nl = n - 1; while (ml >= 0 && nl >= 0) { nums1[end--] = nums1[ml] > nums2[nl] ? nums1[ml--] : nums2[nl--]; } while (nl >= 0) { nums1[end--] = nums2[nl--]; } } }