Project Euler Problem #19

February 8, 2010

Read the details of the problem here


How many Sundays fell on the first of the month during the twentieth century?


If you’ve got it, flaunt it. Here’s a brute-force solution that simply uses the Java built-in calendar classes for a very quickly derived answer.

def (answer, cal)  = [ 0, new GregorianCalendar() ]

1901.upto(2000) { y ->
    12.times { m ->
        cal.set(y, m , 1)
        if (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) answer++

Runs in 0.57 seconds. Seems slow for what it’s doing but that’s Groovy for you…


Groovy didn’t make a lot of impact here, apart from keeping the syntax a little cleaner than Java would have been.


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