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OA 还是longest chain 以及Friend circle
店面感觉是新题,或者可能我面经没看全
generate random number within a range [begin, end) without duplicate until you have all numbers from the range
e.g. 1 to 5,
call 6 times:e the range, you still cannot output old output number until you hit the end of the round
求大米
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