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                >[danger]第二題:給兩個字符串,可以修改第一個字符串的一個字符(只能修改第一個字符串,第二個不可以改),求兩個字符串的相同前綴數和相同后綴數乘積。 ????這道題90%,解法是先求出相同前綴數和相同后綴數是多少,如果前綴數或者后綴數已經是第一個字符串的長度了,那么直接返回乘積,否則分別從前綴方向和后綴方向修改第一個不相同的字符,重新計算前綴數和后綴數去比較乘積大小,不知道遺漏了什么特殊情況。
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