26 lines
908 B
YAML
26 lines
908 B
YAML
|
title: How many Sundays fell on the first of the month during the twentieth century?
|
||
|
|
url: http://projecteuler.net/problem=19
|
||
|
|
|
||
|
|
desc: |
|
||
|
|
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)?
|
||
|
|
|
||
|
|
|
||
|
|
solution: Instead of using buildtin DateTime language features this use a homemade algorithm
|
||
|
|
|
||
|
|
solutions:
|
||
|
|
solve.php:
|
||
|
|
desc: Basic solution
|
||
|
|
language: php
|
||
|
|
solve.rb:
|
||
|
|
desc: Basic solution
|
||
|
|
language: ruby
|