算法笔记练习 4.2 散列 问题 D: 【PAT A1050】String Subtraction

算法笔记练习 题解合集web 题目连接算法 题目 Given two strings S1 and S​2, S = S1−S2 is defined to be the remaining string after taking all the characters in S​2 from S​1. Your task is simply to calculate S1−S​2 for any
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