Hard！ 題目描述： 給定一個字符串 s1，我們可以把它遞歸地分割成兩個非空子字符串，從而將其表示為二叉樹。 下圖是字符串 s1 = "great" 的一種可能的表示形式。 在擾亂這個字符串的過程中，我們可以挑選任何一個非葉節點，然后交換它的兩個子節點。 例如，如果我們挑選非葉節點 ...

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

題目： 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 ...