72. Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a…

一.题目说明 题目72. Edit Distance,计算将word1转换为word2最少需要的操作.操作包含:插入一个字符,删除一个字符,替换一个字符.本题难度为Hard! 二.我的解答 这个题目一点思路也没,就直接看答案了.用的还是dp算法,dp[n1+1][n2+1]中的dp[i][j]表示将word1的前i位,变为word2的前j位需要的步骤.注意第1行是空,第1列也是空. 1.第一行中,dp[0][i]表示空字符""到word2[0,...,i]需要编辑几次 2.第一列中,d…

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitted on a word: Insert a character Delete a character Replace a character Example 1: Input: word1 = "h…

题目: Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a characterc) Rep…

传送门 Description Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a cha…

Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a char…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a character c) Repla…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a characterc) Replace…

计算最少用多少不把word1变为word2, 思路:建立一个dp表,行为word1的长度,宽为word2的长度 1.边界条件,dp[i][0] = i,dp[0][j]=j 2.最优子问题,考虑已经知道word1[0:i-1]转变为word2[0:j-1]的次数,只需要考虑word1[i]和word[j]的情况 3.子问题重叠,word1[i]和word2[j]是否相等,每种情况下怎样有最少步骤 class Solution(object): def minDistance(self, word…

Leetcode72 看起来比较棘手的一道题(列DP方程还是要大胆猜想..) DP方程该怎么列呢? dp[i][j]表示字符串a[0....i-1]转化为b[0....j-1]的最少距离 转移方程分三种情况考虑 分别对应三中操作 因为只需要三个值就可以更新dp[i][j] 我们可以把空间复杂度降低到O(n) Replace word1[i - 1] by word2[j - 1] (dp[i][j] = dp[i - 1][j - 1] + 1 (for replacement)); Delet…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a characterc) Replace…

最小编辑距离,动态规划经典题. Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a cha…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given two words word1 and word2, find the minimum number of steps ?>required to convert word1 to word2. (each operation is counted as 1 step.) You have the f…

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitted on a word: Insert a character Delete a character Replace a character 题意: 给定两个串串: word1, word2;  找…

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitted on a word: Insert a character Delete a character Replace a character Example 1: Input: word1 = "h…

原题 dp 利用二维数组dp[i][j]存储状态: 从字符串A的0~i位子字符串 到 字符串B的0~j位子字符串,最少需要几步.(每一次删增改都算1步) 所以可得边界状态dp[i][0]=i,dp[0][j]=j. 以及状态转移方程 即当比较 word1[i] 和 word2[j] 字符 相等 时,所需步数与 word1[i-1] 和 word2[j-1] 相等. 状态转移方程为:dp[i][j]=dp[i-1][j-1] 否则,状态转移方程为dp[i][j]= min(dp[i-1][j-1]…

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2. You have the following 3 operations permitted on a word: Insert a character Delete a character Replace a character Example 1: Input: word1 = "h…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 递归 记忆化搜索 动态规划 日期 题目地址:https://leetcode.com/problems/edit-distance/description/ 题目描述 Given two words word1 and word2, find the minimum number of operations required to convert w…

Given two strings s and t, determine if they are both one edit distance apart. Note: There are 3 possiblities to satisify one edit distance apart: Insert a character into s to get t Delete a character from s to get t Replace a character of s to get t…

Leetcode之动态规划(DP)专题-72. 编辑距离(Edit Distance) 给定两个单词 word1 和 word2,计算出将 word1 转换成 word2 所使用的最少操作数 . 你可以对一个单词进行如下三种操作: 插入一个字符 删除一个字符 替换一个字符 示例 1: 输入: word1 = "horse", word2 = "ros" 输出: 3 解释: horse -> rorse (将 'h' 替换为 'r') rorse -> r…

题目 Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a character c) Re…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a characterc) Replace…

Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a chara…

http://blog.csdn.net/abcjennifer/article/details/7735272 自然语言处理(NLP)中,有一个基本问题就是求两个字符串的minimal Edit Distance, 也称Levenshtein distance.受到一篇Edit Distance介绍文章的启发,本文用动态规划求取了两个字符串之间的minimal Edit Distance. 动态规划方程将在下文进行讲解. 简单地说,就是仅通过插入(insert).删除(delete)和替换(s…

Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a chara…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a character c) Repla…

题目: Given two strings S and T, determine if they are both one edit distance apart. 链接: http://leetcode.com/problems/one-edit-distance/ 题解: 求两个字符串是否只有1个Edit Distance. 看着这道题又想起了Edit Distance那道.不过这道题不需要用DP,只用设一个boolean变量hasEdited来逐字符判断就可以了.写法大都借鉴了曹神的代码.…

本文已授权 [Coding博客](https://blog.coding.net) 转载 前言 Edit Distance,中文叫做编辑距离,在文本处理等领域是一个重要的问题,以下是摘自于百度百科的定义 编辑距离(Edit Distance),又称Levenshtein距离,是指两个字串之间,由一个转成另一个所需的最少编辑操作次数.许可的编辑操作包括将一个字符替换成另一个字符,插入一个字符,删除一个字符. 分别用R(replace),I(insert),D(delete),M(Match)代表替…

Edit Distance Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a characterb) Delete a chara…

1. N-Queens The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. Each solution contains a distinct board confi…