我原先理解的是數組裏原先有一個key(數組裏存著'A1','B1'...)
dynamic解釋清楚了。所以我等於多用了O(n)的memory
我原先理解的是數組裏原先有一個key(數組裏存著'A1','B1'...)
dynamic解釋清楚了。所以我等於多用了O(n)的memory
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