摘要： Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. 找二叉搜索树中第k个小的值。 用中序遍历，增加一个全局变量记录访问到第几个节点，返回访问的第k个节点的值。 阅读全文

摘要： On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y 阅读全文

摘要： N-皇后问题（n*n棋盘上，放n个皇后，要求每一行，每一列，每一斜线都不能同时出现两个皇后）。统计一共有多少种方法。 解决：Backtracking. 添加pos变量：用来记录前几行皇后的位置 阅读全文

摘要： Given a list of sorted characters letters containing only lowercase letters, and given a target letter target, find the smallest element in the list t 阅读全文

摘要： Given the root of a binary tree, then value v and depth d, you need to add a row of nodes with value v at the given depth d. The root node is at depth 阅读全文

摘要： A zero-indexed array A of length N contains all integers from 0 to N-1. Find and return the longest length of set S, where S[i] = {A[i], A[A[i]], A[A[ 阅读全文

摘要： The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each hou 阅读全文

摘要： 从一个文件，读取数据，再输出，一般在代码里实现就是用<fstream>，如http://www.cnblogs.com/Zzz-y/p/7885948.html 使用文件重定向会更加方便。 一段非常简单的输入输出数据的代码。编译，生成test.exe。 在命令窗口，在test.exe根目录下，输入 阅读全文

摘要： Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks.Tasks could 阅读全文

摘要： Given a list of daily temperatures, produce a list that, for each day in the input, tells you how many days you would have to wait until a warmer temp 阅读全文