Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortes…

  Given a binary tree, return the postorder traversal of its nodes’ values. For example: Given bina…

  Say you have an array for which the ith element is the price of a given stock on day i. …

最近完成了www.leetcode.com的online judge中151道算法题目。除各个题目有特殊巧妙的解法以外，大部分题目都是经典的算法或者数据结构，因此做了如下小结，具体的解题思路可以搜索我的博客：LeetCo…

Search for a Range Given a sorted array of integers, find the starting and ending position of a given target v…

1. 题目 Merge two sorted linked lists and return it as a new list. The new list should be made by splicing toget…

  Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target…

  Given a string that consists of only uppercase English letters, you can replace any letter in the strin…

1. 题目 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For examp…

  Chapter 1. Arrays and Strings 1.1 Unique Characters of a String 1.2 Reverse String 1.3 Permutation Stri…

  Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash s…

  Given the root node of a binary search tree (BST) and a value to be inserted into the tree, insert…