/* Given an int array, return a new array with double the length where its * last element is the same as the original array, and all the other elements * are 0. The original array will be length 1 or more. Note: by default, a * new int array contains all 0's. */ public int[] makeLast(int[] nums) { int[] arr = new int[2 * nums.length]; arr[arr.length - 1] = nums[nums.length - 1]; return arr; }