Cheryl's birthday: Difference between revisions
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Cheryl's birthday is July 16
</pre>
=={{header|Groovy}}==
{{trans|Java}}
<lang groovy>import java.time.Month
class Main {
private static class Birthday {
private Month month
private int day
Birthday(Month month, int day) {
this.month = month
this.day = day
}
Month getMonth() {
return month
}
int getDay() {
return day
}
@Override
String toString() {
return month.toString() + " " + day
}
}
static void main(String[] args) {
List<Birthday> choices = [
new Birthday(Month.MAY, 15),
new Birthday(Month.MAY, 16),
new Birthday(Month.MAY, 19),
new Birthday(Month.JUNE, 17),
new Birthday(Month.JUNE, 18),
new Birthday(Month.JULY, 14),
new Birthday(Month.JULY, 16),
new Birthday(Month.AUGUST, 14),
new Birthday(Month.AUGUST, 15),
new Birthday(Month.AUGUST, 17)
]
println("There are ${choices.size()} candidates remaining.")
// The month cannot have a unique day because Albert knows the month, and knows that Bernard does not know the answer
Set<Birthday> uniqueMonths = choices.groupBy { it.getDay() }
.values()
.findAll() { it.size() == 1 }
.flatten()
.collect { ((Birthday) it).getMonth() }
.toSet() as Set<Birthday>
def f1List = choices.findAll { !uniqueMonths.contains(it.getMonth()) }
println("There are ${f1List.size()} candidates remaining.")
// Bernard now knows the answer, so the day must be unique within the remaining choices
List<Birthday> f2List = f1List.groupBy { it.getDay() }
.values()
.findAll { it.size() == 1 }
.flatten()
.toList() as List<Birthday>
println("There are ${f2List.size()} candidates remaining.")
// Albert knows the answer too, so the month must be unique within the remaining choices
List<Birthday> f3List = f2List.groupBy { it.getMonth() }
.values()
.findAll { it.size() == 1 }
.flatten()
.toList() as List<Birthday>
println("There are ${f3List.size()} candidates remaining.")
if (f3List.size() == 1) {
println("Cheryl's birthday is ${f3List.head()}")
} else {
System.out.println("No unique choice found")
}
}
}</lang>
{{out}}
<pre>There are 10 candidates remaining.
There are 5 candidates remaining.
There are 3 candidates remaining.
There are 1 candidates remaining.
Cheryl's birthday is JULY 16</pre>
=={{header|Haskell}}==
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