[백준] 1924번 : 2007년 - C

https://www.acmicpc.net/problem/1924

#include<stdio.h>

int main() {
    int x,y;
    scanf("%d %d",&x,&y);
    int arr[]={31,28,31,30,31,30,31,31,30,31,30,31};
    int sum=0;
    for(int i=0;i<x-1;i++) sum+=arr[i];
    
    int day=sum+y;
    if(day%7==0) printf("SUN");
    else if(day%7==1) printf("MON");
    else if(day%7==2) printf("TUE");
    else if(day%7==3) printf("WED");
    else if(day%7==4) printf("THU");
    else if(day%7==5) printf("FRI");
    else printf("SAT");
}