Search in a binary search tree
这题没难度，首先看下题目： Given the root node of a binary search tree (BST) and a value. You need to find the no...
N-ary Tree Preorder Traversal
这题的数据结构还是上一题的，很简单，熟悉二叉树遍历的看一眼就写出来了。先看题目： Given an n-ary tree, return the preorder traversal of its n...
Maximum Depth of N-ary Tree
先看题目 Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the ...
Shortest Completing Word
这题没啥好说的，但是我理解题意理解了好久。。。 Find the minimum length word from a given dictionary words, which has all th...
To lower Case
这题不多说，不会做的闭门思过。 Implement function ToLowerCase() that has a string parameter str, and returns the sa...
Lemonade Change
这题不难，核心是找零问题，首先看下题目： At a lemonade stand, each lemonade costs $5. Customers are standing in a queue ...
Buddy Strings
我又回来了，继续刷算法，可能的话，英文也想加强一下。由于好久没有刷了，先把新增的几个easy级别题目做了。首先看下面这题： Given two strings A and B of lowercase...
wiggle sequence
这题没有做过类似的，所以感觉还是有点难度的，先来看下题目： A sequence of numbers is called a wiggle sequence if the differences b...
Largest Divisible Subset
Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of ...
House Robber III
The thief has found himself a new place for his thievery again. There is only one entrance to this a...