sichenzhao

摘要： Title:Given a linked list, swap every two adjacent nodes and return its head.For example,Given 1->2->3->4, you should return the list ... 阅读全文

摘要： Title：Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3,... 阅读全文

摘要： Title:Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the fir... 阅读全文

摘要： Title:Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The bracke... 阅读全文

摘要： Title:Given a linked list, remove the nth node from the end of list and return its head.For example, Given linked list: 1->2->3->4->... 阅读全文

摘要： Title:Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadrup... 阅读全文

摘要： Title:Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (jus... 阅读全文

摘要： 最近刷leetcode题时，碰到题目需要用到递归算法，否则基本无解。接下来结合实例谈谈本人对递归算法的理解。对递归算法的形象解释：想象用一本纯英文词典查单词，要查某一个单词的意思，翻到这个单词时，看解释，发现解释中有一个单词不认识，所以，无法明白这个要查的单词是什么意... 阅读全文

摘要： Title:Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum ... 阅读全文

摘要： Title:Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array w... 阅读全文