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题目： Given a singly linked list, determine if it is a palindrome. Follow up:Could you do it in O(n) time and O(1) space? 链接： http://leetcode.com/proble 阅读全文
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题目： Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in f 阅读全文
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题目： Given an integer, write a function to determine if it is a power of two. 链接： http://leetcode.com/problems/power-of-two/ 2/28/2017 看别人的。看来要注意各种比特运算 阅读全文
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题目： Invert a binary tree. to Trivia:This problem was inspired by this original tweet by Max Howell: 链接： http://leetcode.com/problems/invert-binary-tre 阅读全文