## 23 de noviembre de 2013

### Counting Sundays - Project euler, problema 19

El problema es el que sige:

You are given the following information, but you may prefer to do some research for yourself.
• 1 Jan 1900 was a Monday.
• Thirty days has September,
• April, June and November.
• All the rest have thirty-one,
• Saving February alone,
• Which has twenty-eight, rain or shine.
• And on leap years, twenty-nine.
• A leap year occurs on any year evenly divisible by 4, but not on a century unless it is divisible by 400.
How many Sundays fell on the first of the month during the twentieth century (1 Jan 1901 to 31 Dec 2000)?
Y la explicación, que es bastante sencilla, está en los comentarios del código:

%Pasan 100 años
floor(1200/7) %no contamos fracciones de domingo :P