37 lines
1014 B
Python
37 lines
1014 B
Python
#!/usr/bin/env python3
|
|
|
|
# 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)?
|
|
|
|
import datetime
|
|
|
|
from projecteuler import timing
|
|
|
|
|
|
@timing
|
|
def p019() -> None:
|
|
count = 0
|
|
|
|
# Use the datetime library to find out which first day of the month is a Sunday
|
|
for year in range(1901, 2001):
|
|
for month in range(1, 13):
|
|
if datetime.datetime(year, month, 1).weekday() == 6:
|
|
count = count + 1
|
|
|
|
print('Project Euler, Problem 19')
|
|
print(f'Answer: {count}')
|
|
|
|
|
|
if __name__ == '__main__':
|
|
p019()
|