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That's because long long is used to store -2^63 to (2^63)-1 because last bit is used as sign bit in long long where as in unsigned all bits are used for magnitude hence giving you a range of 0 to (2^64)-1
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That's because long long is used to store -2^63 to (2^63)-1 because last bit is used as sign bit in long long where as in unsigned all bits are used for magnitude hence giving you a range of 0 to (2^64)-1