Kotlin每日打卡（分类讨论）：``` class Solution { fun minOperations(nums: IntArray): Int { val size = nums.size if (size == 1) { return 0 } var commonDifference = nums[1] - nums[0] if (Math.abs(commonDifference)

Kotlin每日打卡（贪心与分类讨论 - 两次遍历）：``` class Solution { fun minOperations(s: String): Int { val n = s.length if (n == 2) { return if (s[0] <= s[1]) 0 else -1 } var minChar = s[0] var maxChar = s[0] var isReve