摘要：
https://oj.leetcode.com/problems/reverse-nodes-in-k-group/ Given a linked list, reverse the nodes of a linked list k at a time and return its modified 阅读全文
摘要：
https://oj.leetcode.com/problems/merge-k-sorted-lists/Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.... 阅读全文
摘要：
https://oj.leetcode.com/problems/generate-parentheses/Given n pairs of parentheses, write a function to generate all combinations of well-formed paren... 阅读全文
摘要：
https://oj.leetcode.com/problems/valid-parentheses/ Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the in 阅读全文
摘要：
https://oj.leetcode.com/problems/letter-combinations-of-a-phone-number/ Given a digit string, return all possible letter combinations that the number 阅读全文