return (compare(firstname1, firstname2) == 0 ?(compare(lastname1, lastname2) == 0 ? (compare(sex1, sex2) == 0 ? (compare(age1, age2) == 0 ? 0 :compare(age1, age2)) :compare(sex1, sex2)) :compare(lastname1, lastname2)) :compare(firstname1, firstname2));"："后的是什么意思
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