Given two words (beginWord and endWord), and a dictionary’s word list, find all shortest transformation sequence(s) from beginWord to endWord, such th ...

Given two words (beginWord and endWord), and a dictionary’s word list, find the length of shortest transformation sequence from beginWord to endWord, ...

Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja ...

Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where “adjac ...

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. E ...

Given an input character array, reverse the array word by word. A word is defined as a sequence of non-space characters. The input character array doe ...

Given an input string, reverse the string word by word. ExampleNo.1Input: “the sky is blue” Output: “blue is sky the” No.2Input: “ hello world! “ Ou ...

Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there ar ...

Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra space for another array, yo ...

Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence. For example, in the given ...