1173 : 30분전

#include <stdio.h>
 
int main()
{
    int hour, minute;
    int re_hour, re_minute;
    scanf("%d %d", &hour, &minute);
    
    if (hour >= 0 && minute >= 30){
        re_hour = hour;
        re_minute = minute - 30;
    }else if (hour > 0 && minute < 30){
        re_hour = hour - 1;
        re_minute = 30 + minute;
    }else{
        re_hour = 23;
        re_minute = 30 + minute;
    }
    
    printf("%d %d", re_hour, re_minute);
    return 0;
}