Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.
Note:
You may assume that nums1 has enough space (size that is greater or equal to m + n) to hold additional elements from nums2. The number of elements initialized in nums1 and nums2 are m and n respectively.
合并两个已经有序的数组,结果放在第一个数组中,第一个数组假设空间足够大。要求算法时间复杂度足够低。
为了不大量移动元素,就要从2个数组长度之和的最后一个位置开始,依次选取两个数组中大的数,从第一个数组的尾巴开始往头放,只要循环一次以后,就生成了合并以后的数组了。