我原先理解的是数组里原先有一个key(数组里存着'A1','B1'...)
dynamic解释清楚了。所以我等于多用了O(n)的memory
我原先理解的是数组里原先有一个key(数组里存着'A1','B1'...)
dynamic解释清楚了。所以我等于多用了O(n)的memory
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