-
Notifications
You must be signed in to change notification settings - Fork 0
/
19.py
29 lines (24 loc) · 849 Bytes
/
19.py
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
# 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)?
s = 2 # Jan 1, 1901 is a Tuesday
c = 0
days_in_months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
for year in range(1901, 2001):
for month in range(12):
if (s) % 7 == 0:
c += 1
s += days_in_months[month]
if month == 1 and year % 4 == 0:
s += 1
print c