剑指 Offer(第 2 版) https://leetcode.cn/problem-list/xb9nqhhg/ 剑指 Offer 03. 数组中重复的数字 https://leetcode.cn/problems/shu-zu-zhong-zhong-fu-de-shu-zi-lcof/ # 法1:哈希表(Set) class Solution:def findRepeatNumber(self, nums: [