1. Problem Statement (Simple Explanation) You’re given: nums1: an integer array of length m + n The first m elements are valid, sorted in non-decreasing order. The last n elements are placeholders (zeros) to accommodate merging. nums2: an integer array of length n, sorted in non-decreasing order. Integers m and n: number of valid elements in nums1 and nums2. You must: Merge nums2 into nums1, so that the first m + n elements of nums1 become a sorted array. Do this in-place (modify nums1, don’t return a new array). Time complexity O(m + n) is required. 2. Examples Example 1: Input: nums1 = [1,2,3,0,0,0], m = 3 nums2 = [2,5,6], n = 3 Arrays to merge: [1,2,3] and [2,5,6] Result: [1,2,2,3,5,6] Output (nums1 after): [1,2,2,3,5,6] Example 2: Input: nums1 = [1], m = 1 nums2 = [], n = 0 Nothing to merge;...