[交流] Euler 工程 第十九题：每月第一天是周日的天数 已有3人参与

# -*- coding: utf-8 -*-

days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

date = [1900, 1, 1]

cntSundays = 0

while date[0] < 2001:
    date[2] += 7
    if date[0] % 400 == 0 or date[0] % 4 == 0:
        days[2] = 29
    else:
        days[2] = 28

    if date[2] > days[date[1]]:
        date[2] -= days[date[1]]
        date[1] += 1

    if date[1] > 12:
        date[0] += 1
        date[1] = 1

    if 1901 <= date[0] <= 2000 and date[2] == 2:
        cntSundays += 1

print cntSundays