lc 712 Minimum ASCII Delete Sum for Two Strings 712 Minimum ASCII Delete Sum for Two Strings Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal. Example 1: Input: s1 = "sea", s2 = "eat"…

Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal. Example 1: Input: s1 = "sea", s2 = "eat" Output: 231 Explanation: Deleting "s" from "sea" adds the ASCII value of…

这道题的思路:我是根据最长公共子序列的思路得来的. 最长公共子序列是: d[i][j]表示字符串s1前i个(0-i-1)字符,和字符串s2前j个(0-j-1)字符的最长公共子序列. 分情况讨论: 当s1[i-1] == s2[j-1]的时候,d[i][j] = d[i-1][j-1]+1; 这个表示 ,当第i-1个字符相同时,就在之前d[i-1][j-1]的长度上加一 当s1[i-1] != s2[j-1]的时候,d[i][j] 的值就有可能有两种情况: (1)d[i][j] = d[i-1][…

712. 两个字符串的最小ASCII删除和 给定两个字符串s1, s2,找到使两个字符串相等所需删除字符的ASCII值的最小和. 示例 1: 输入: s1 = "sea", s2 = "eat" 输出: 231 解释: 在 "sea" 中删除 "s" 并将 "s" 的值(115)加入总和. 在 "eat" 中删除 "t" 并将 116 加入总和. 结束时,两个字符串相…

题目描述: https://leetcode-cn.com/problems/minimum-ascii-delete-sum-for-two-strings/ 解题思路: 也是典型的dp问题.利用二维dp数组求解. 建立一个二维数组Dp[ i ][ j ],Dp[ i ][ j ]表示从s1中拿出 i 个元素和从 s2 中拿出 j 个元素的最小删除数. 当s1[i]=s2[j]时,dp[i][j] = dp[i-1][j-1]. 当s1[i]!=s2[j], 动态转移方程为: dp[i][j]…

Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal. Example 1: Input: s1 = "sea", s2 = "eat" Output: 231 Explanation: Deleting "s" from "sea" adds the ASCII value of…

Given two words word1 and word2, find the minimum number of steps required to make word1 and word2 the same, where in each step you can delete one character in either string. Example 1: Input: "sea", "eat" Output: 2 Explanation: You ne…

Leetcode之动态规划(DP)专题-712. 两个字符串的最小ASCII删除和(Minimum ASCII Delete Sum for Two Strings) 给定两个字符串s1, s2,找到使两个字符串相等所需删除字符的ASCII值的最小和. 示例 1: 输入: s1 = "sea", s2 = "eat" 输出: 231 解释: 在 "sea" 中删除 "s" 并将 "s" 的值(115)加入总…

题目如下: 解题思路:本题和[leetcode]583. Delete Operation for Two Strings 类似,区别在于word1[i] != word2[j]的时候,是删除word1[i]还是word2[j]取决于min(dp[i-1][j]+ord(word1[i-1]),dp[i][j-1]+ord(word2[j-1])). 代码如下: class Solution(object): def minimumDeleteSum(self, s1, s2): ""…

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 日期 题目地址:https://leetcode.com/problems/minimum-ascii-delete-sum-for-two-strings/description/ 题目描述 Given two strings s1, s2, find the lowest ASCII sum of deleted characters to ma…