LeetcodeHot100链表160. 相交链表https://leetcode.cn/problems/intersection-of-two-linked-lists/solutions/2770777/160-xiang-jiao-lian-biao-by-joker-ek4-69ns 206. 反转链表https://leetcode.cn/problems/reverse-linked-list/solutions/2771061/206-fan-zhuan-lian-biao-by-joker-ek4-lm6d 栈20. 有效的括号https://leetcode.cn/problems/valid-parentheses/solutions/2771702/20-you-xiao-de-gua-hao-by-joker-ek4-zsmo
