Hard！ 题目描述： 给定一个字符串 s1，我们可以把它递归地分割成两个非空子字符串，从而将其表示为二叉树。 下图是字符串 s1 = "great" 的一种可能的表示形式。 在扰乱这个字符串的过程中，我们可以挑选任何一个非叶节点，然后交换它的两个子节点。 例如，如果我们挑选非叶节点 ...

representation of s1 = "great": To scramble the string, we ...

题目： Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one possible ...

A magical string S consists of only '1' and '2' and obeys the following rules: The string S is magical because ...

We are given two strings, A and B. A shift on A consists of taking string A and moving the leftmost character to the rightmost position. ...

Given an array of characters, compress it in-place. The length after compression must always be ...

Scramble String Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively. Below is one ...

Given a set of keywords words and a string S, make all appearances of all keywords in S bold. Any letters between <b> and </b> tags ...