Leaf-Similar Trees
Consider all the leaves of a binary tree. From left to right order, the values of those leaves form ...
Binary gap
Given a positive integer N, find and return the longest distance between two consecutive 1's in the ...
Transpose matrix
Given a matrix A, return the transpose of A. The transpose of a matrix is the matrix flipped over it...
Design hashset
Design a HashSet without using any built-in hash table libraries. To be specific, your design should...
Binary search
这题是基础题，但是细节挺多的，先上题目 Given a sorted (in ascending order) integer array nums of n elements and a targe...
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...