摘要： Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitt 阅读全文

摘要： Implement int sqrt(int x). Compute and return the square root of x, where x is guaranteed to be a non-negative integer. Since the return type is an in 阅读全文

摘要： Given an array of words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justif 阅读全文

摘要： A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p 阅读全文