OJ-Problems-Source/HDOJ/1308_autoAC.cpp

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2016-08-13 23:51:27 +08:00
#include <stdio.h>
int calculate(int year, int month, int day);
int main()
{
const char *weekdays[] =
{
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"
};
const char *monthname[] =
{
"January", "February", "March", "April",
"May", "June", "July", "August",
"September", "October", "November", "December"
};
int year, month, day, week;
while (scanf("%d%d%d", &month, &day, &year) != EOF)
{
if (year == 0 && month == 0 && day == 0)
break;
week = calculate(year, month, day);
if (week == -1)
printf("%d/%d/%d is an invalid date.\n", month, day, year);
else
printf("%s %d, %d is a %s\n", monthname[month - 1], day, year, weekdays[week]);
}
return 0;
}
int calculate(int year, int month, int day)
{
int count, leap, century;
static const int daycount[] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
if (year <= 0 || month > 12 || month < 1 || day < 1 || day > 31)
return -1;
if ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30)
return -1;
if (year <= 1752)
{
if (year == 1752 && month == 9 && day > 2 && day < 14)
return -1;
if (year % 4 == 0)
{
leap = 1;
if (month == 2)
{
if (day > 29)
return -1;
}
}
else
{
leap = 0;
if (month == 2)
{
if (day > 28)
return -1;
}
}
count = (year - 1) * 365 + (year - 1) / 4;
count += daycount[month - 1] + day;
if (leap && month > 2)
count += 1;
if (year == 1752)
{
if (month > 9 || (month == 9 && day >= 14))
count -= 11;
}
return ((count + 5) % 7);
}
else
{
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
{
leap = 1;
if (month == 2)
{
if (day > 29)
return -1;
}
}
else
{
leap = 0;
if (month == 2)
{
if (day > 28)
return -1;
}
}
century = (year - 1) / 100 - 17;
count = (year - 1) * 365 + (year - 1) / 4;
count += (daycount[month - 1] + day);
count -= (11 + century);
count += (century + 1) / 4;
if (leap && month > 2)
count += 1;
return ((count + 5) % 7);
}
return -1;
}