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#define _CRT_SECURE_NO_WARNINGS#include 
   
    int isleap(int year);        //判断是否为闰年int month_day(int year, int month);    //返回某月的天数int month_first_day_week(int year, int month);    //返回某月的第一天是星期几void print_calendar(int year, int month);         //打印某年某月日历int main() {
   	int year, month;	scanf("%d %d", &year, &month);	print_calendar(year, month);	return 0;}int isleap(int year) {
   	if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)		return 1;	else		return 0;}int month_day(int year, int month) {
   	switch (month)	{
   	case 2:		if (isleap(year)) {
   			return 29;		}		else {
   			return 28;		}		break;	case 4:	case 6:	case 9:	case 11:		return 30;		break;	case 1:	case 3:	case 5:	case 7:	case 8:	case 10:	case 12:		return 31;		break;	default:		break;	}}int month_first_day_week(int year, int month) {
   	int week = 1;	for (int i = 1900; i < year; i++) {
     		++week;    //  365 % 7 = 1		if (isleap(i)) {
   			++week;		}	}	for (int i = 1; i < month; i++) {
   		week += month_day(year, i);	}	week %= 7;	return week;}void print_calendar(int year, int month) {
   	int days, day_week;	int i = 1;	int day = 1;	printf("%4d-%02d\n", year, month);	printf("Mon   Tue   Wed   Thu   Fri   Sat   sun\n\n");	days = month_day(year, month);	day_week = month_first_day_week(year, month);	if (day_week == 0) {
   		day_week = 7;	}	while (i < day_week) {
   		printf("      ");		i++;	}	while (day <= days) {
   		printf("%-6d", day);		day++;		i = i % 7;		if (i == 0) {
   			printf("\n\n");		}		//i = i % 7;		i++;	}	if (i != 0) {
   		printf("\n");	}}
   

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