#include<bits/stdc++.h>

// 判断是否为闰年 (考虑1582年前后差异）
int isLeapYear(int year) {
    if (year >= 1582) {
        if ((year%4 ==0 && year%100!=0) || year%400==0) {
            return 1;
        }
        return 0;
    } else {
        if (year % 4 == 0) {
            return 1;
        }
        return 0;
    }
}

// 检查输入是否为数字
int isnumber(char input[]) {
    int i = 0;
    while (input[i]!= '\0') {
        if (input[i] < '0' || input[i] > '9') {
            return 0;
        }
        i++;
    }
    return 1;
}

// 检查日期是否有效
int Dateisture(int year, int month, int day) {
    if (year == 1582 && month == 10 && (day > 4 && day <= 14)) {
        return 0;
    }

    int daysInMonth[] = {0, 31, 28, 31, 32, 30, 31, 30, 31, 30, 31, 30, 31};
    if (isLeapYear(year)) {
        daysInMonth[2] = 29;
    }
    
    if(year>=1 && month>=1 && month<=12 && day>=1 && day<=daysInMonth[month]){
    	return 1;
	} 
    return 0;
}

// 计算给定日期是星期几（考虑1582年前后差异）
int dayOfWeek(int year, int month, int day) {
    if (year >= 1582) {
        if (month < 3) {
            year--;
            month += 12;
        }
        int c = year / 100;
        int y = year % 100;
        int week = (c / 4 - 2 * c + y + y / 4 + 13 * (month + 1) / 5 + day - 1) % 7;
        if (week < 0) {
            week += 7;
        }
        return week;
    } else {
        int a = (14 - month) / 12;
        int y = year - a;
        int m = month + 12 * a - 2;
        int week = (day + y + y / 4 - y / 100 + y / 400 + (31 * m) / 12) % 7;
        return week;
    }
}

// 输出（单列）
void Single(int year) {
    int daysInMonth[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if (isLeapYear(year)) {
        daysInMonth[2] = 29;
    }
    printf("%d年的日历(单列):\n", year);
    int dayOfWeekJan1 = dayOfWeek(year, 1, 1);
    for (int month = 1; month <= 12; month++) {
	    printf("Mon  Tue  Wed  Thu  Fri  Sat  Sun\n");
        for (int day = 1; day <= daysInMonth[month]; day++) {
            printf("%3d  ", day);
            if ((dayOfWeekJan1 + day) % 7 == 0 && day!= daysInMonth[month]) {
                printf("\n");
            }
        }printf("\n");
    }
    printf("\n");
}

// 输出（双列）
void Double(int year) {
    int daysInMonth[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    if (isLeapYear(year)) {
        daysInMonth[2] = 29;
    }

    printf("%d年的日历(双列):\n", year);
    int dayOfWeekJan1 = dayOfWeek(year, 1, 1);
    for (int month = 1; month <= 12; month++) {
	printf("Mon  Tue  Wed  Thu  Fri  Sat  Sun \t Mon  Tue  Wed  Thu  Fri  Sat  Sun");
        for (int day = 1; day <= daysInMonth[month]; day++) {
            printf("%3d  ", day);
            if ((dayOfWeekJan1 + day) % 7 == 0 && day!= daysInMonth[month]) {
                printf("\n");
            }
        }printf("\n");
    }
    printf("\n");
}

int main() {
	char choice[10];
	int zh;
    do{    
	    printf("1. 我想查询某年某月某日是星期几，该年是否为闰年\n");
        printf("2. 我想查询某年的日历\n");
        printf("3. 上个厕所\n");
        printf("请选择: ");
        scanf("%9s",choice);
        if(!isnumber(choice)){
        	printf("输入错误，请重新输入\n");
			continue; 
		}
		zh=choice[0]-'0';
    switch(zh){
        case 1:    char years[10], months[10], days[10];
            int year, month, day;
            while (1) {
                printf("请输入年份: ");
                scanf("%s", years);
                if (!isnumber(years)) {
                    printf("错误，重新开始\n");
                    continue;
                }
                year = atoi(years);
                printf("请输入月份: ");
                scanf("%s", months);
                if (!isnumber(months)) {
                    printf("请误，重新开始\n");
                    continue;
                }
                month = atoi(months);

                printf("请输入日期: ");
                scanf("%s", days);
                if (!isnumber(days)) {
                    printf("请误，重新开始\n");
                    continue;
                }
                day = atoi(days);

                if (!Dateisture(year, month, day)) {
                    printf("输入错误，请重新输入\n");
                    continue;
                }

                int weekDay = dayOfWeek(year, month, day);
                char weekDayNames[][10] = {"周一", "周二", "周三", "周四", "周五", "周六", "周天"};
                printf("%d-%02d-%02d是%s\n", year, month, day, weekDayNames[weekDay]);
                if (isLeapYear(year)) {
                    printf("%d年是闰年\n", year);
                } else {
                    printf("%d年不是闰年\n", year);
                }
                break;
        }
		case 2:
            char yearss[10];
            while (1) {
                printf("请输入年份: ");
                scanf("%s", yearss);
                if (!isnumber(yearss)) {
                    printf("请输入正确的年份\n");
                    continue;
                }
                year = atoi(yearss);
                Single(year);
                Double(year);
                break;
            }
		case 3:printf("不行");break;
        default:printf("请选择正确选项\n");
                continue;
    }
	}while(zh!=3);
}