Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤ k < max(numRows, numColumns). For example, the wor…

Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤ k < max(numRows, numColumns). For example, the wor…

Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you may assume: words.txt contains only lowercase characters and space ' ' characters. Each word must consist of lowercase characters only. Wor…

Given an array of n distinct non-empty strings, you need to generate minimal possible abbreviations for every word following rules below. Begin with the first character and then the number of characters abbreviated, which followed by the last charact…

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 "adjacent" cells are those horizontally or vertically neighboring. The same letter cell may not be us…

Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that: Only one letter can be changed at a time Each intermediate word must exist in the dictionary For example, Given:start…

其他LeetCode题目欢迎访问:LeetCode结题报告索引 LeetCode:Word Ladder Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that: Only one letter can be changed at a time Each intermediate word…

[leetcode]Word Ladder II @ Python 原题地址:http://oj.leetcode.com/problems/word-ladder-ii/ 参考文献:http://blog.csdn.net/doc_sgl/article/details/13341405   http://chaoren.is-programmer.com/ 题意:给定start单词,end单词,以及一个dict字典.要求找出start到end的所有最短路径,路径上的每个单词都要出现在dict…

题意 略 分析 0.如果直接暴力1000^5会TLE,因此考虑剪枝 1.如果当前需要插入第i个单词,其剪枝如下 1.1 其前缀(0~i-1)已经知道,必定在前缀对应的集合中找 – 第一个词填了ball 后,第二个词必须以a开头 – 第二个词填了area后,第三个词必须以le开头 – 以其他开头的就没必要搜下去了 1.2 第i+1~n-1的单词,必定是以对应位置的0~i-1的前缀+nextWord[k]作为前缀 - 第一个词填了ball – 第二个词想填area的话 – 字典中必须有以le la开…

Description Given a set of words without duplicates, find all word squares you can build from them. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤ k < max(numRows, numColumns). For exampl…