Cheryl's birthday: Difference between revisions
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(add Julia example) |
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uniqueday(parr) = filter(x -> sum(y -> y[1] == x[1], parr) == 1, parr) |
uniqueday(parr) = filter(x -> sum(y -> y[1] == x[1], parr) == 1, parr) |
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# At the start, they come to know that they have no unique day of month to identify. |
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f1 = filter(m -> !(m[2] in [d[2] for d in uniqueday(dates)]), dates) |
f1 = filter(m -> !(m[2] in [d[2] for d in uniqueday(dates)]), dates) |
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# After eliminating all months with unique dates, they now come to know the answer has a unique date. |
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bday = uniqueday(f1)[1] |
bday = uniqueday(f1)[1] |
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println("Cheryl's birthday is $(bday[2]) $(bday[1]).") |
println("Cheryl's birthday is $(bday[2]) $(bday[1]).") |
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</lang>{{out}} |
</lang>{{out}} |
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<pre> |
<pre> |
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