1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#!/usr/bin/ruby
#
# See ../README.md
#
#
# Run as: ruby ch-1.rb < input-file
#
lookup = [
[261, 260, 260, 261, 261, 261, 261],
[262, 261, 260, 261, 262, 262, 262],
]
$sunday = 0
$monday = 1
$tuesday = 2
$wednesday = 3
$thursday = 4
$friday = 5
$saturday = 6
def doomsday (year)
anchor = [$tuesday, $sunday, $friday, $wednesday][(year / 100) % 4]
y = year % 100
return (((y / 12) + (y % 12) + ((y % 12) / 4)) + anchor) % 7
end
def is_leap (year)
if (year % 400 == 0) || (year % 4 == 0) && (year % 100 != 0) then
return 1
end
return 0
end
ARGF . each_line do
| year |
year = year . to_i
puts (lookup [is_leap year] [doomsday year])
end
|
