Smallest Range II
Given an array   A   of integers, for each integer   A[i]   we need to choose   either  x = -K  or  x = K , and add   x   to   A[i]  (only once) .      After this process, we have some array  B .     Return the smallest possible difference between the maximum value   of  B  and the minimum value of  B .           Example 1:       Input: A = [1] , K = 0  Output: 0  Explanation : B = [1]                 Example 2:           Input: A = [0,10] , K = 2  Output: 6 Explanation : B = [2,8]                       Example 3:               Input: A = [1,3,6] , K = 3  Output: 3  Explanation : B = [4,6,3]                 Note:                                   1 <= A.length <= 10000                              0 <= A[i] <= 10000                              0 <= K <= 10000                           Solution:           class Solution {          public int smallestRangeII(int[] A, int K) {      ...