2018年2月28日
摘要：
Implement the following operations of a stack using queues. push(x) Push element x onto stack. pop() Removes the element on top of the stack. top() Ge 阅读全文
摘要：
Reverse a singly linked list. 思路：递归，每次保存一下上一个节点用来构造反转后的链表。 非递归，需要多记录两个值. 阅读全文
摘要：
Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occurrenc 阅读全文
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Remove all elements from a linked list of integers that have value val. 思路：声明两指针，类似快慢指针，快指针遇到val时跳过，直到值不是val这时修改慢指针的next为快指针，慢指针移到快指针这个位置。 阅读全文
摘要：
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文
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Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), retur 阅读全文
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Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in the tree. Not 阅读全文
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Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive intege 阅读全文
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Given two strings s and t which consist of only lowercase letters. String t is generated by random shuffling string s and then add one more letter at 阅读全文
摘要：
We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer arra 阅读全文