James Pan

原题网址：https://leetcode.com/problems/serialize-and-deserialize-binary-tree/Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in

原题网址：https://leetcode.com/problems/permutation-sequence/The set [1,2,3,…,n] contains a total of n! unique permutations.By listing and labeling all of the permutations in order,We get the

原题网址：https://leetcode.com/problems/gray-code/The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integer n representing the total

原题网址：https://leetcode.com/problems/serialize-and-deserialize-bst/Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file