摘要：
题目 Given two strings word1 and word2, return the minimum number of operations required to convert word1 to word2. You have the following three operati 阅读全文
摘要：
题目 Given two strings word1 and word2, return the minimum number of steps required to make word1 and word2 the same. In one step, you can delete exactl 阅读全文