给予相同的位元，无号整数通常能表示由有号整数所代表的值的绝对值的两倍数目。
Given the same number of bits, unsigned integers usually represent twice the number of absolute values representable by signed integers.
给予相同的位元，无号整数通常能表示由有号整数所代表的值的绝对值的两倍数目。
Given the same number of bits, unsigned integers usually represent twice the number of absolute values representable by signed integers.
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