Submission

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Score: 0

User: Pera

Problemset: เลขดวง

Language: c

Time: 0.001 second

Submitted On: 2024-10-16 20:00:18

#include <stdio.h>

int main() {
    int days_in_month, first_day, birthday;
    int sum = 0;
    
    // Input
    printf("Enter the number of days in the month: ");
    scanf("%d", &days_in_month);
    
    printf("Enter the day of the week for the first day (1-Sun, 7-Sat): ");
    scanf("%d", &first_day);
    
    printf("Enter the birthday: ");
    scanf("%d", &birthday);
    
    // Calculate the day of the week for the birthday
    int birthday_day_of_week = ((birthday - 1 + (first_day - 1)) % 7) + 1;
    
    // Check and sum the surrounding days
    if (birthday - 7 > 0) sum += birthday - 7;  // Up
    if (birthday + 7 <= days_in_month) sum += birthday + 7;  // Down
    if (birthday_day_of_week > 1) sum += birthday - 1;  // Left
    if (birthday_day_of_week < 7 && birthday < days_in_month) sum += birthday + 1;  // Right
    
    // Output
    printf("The sum of the surrounding days is: %d\n", sum);
    
    return 0;
}