It’s my first test and it fails due to TLE. Here’s the code

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<errno.h>

int main(){

    long current_num = 0, flag = 0;
    char input[13];

    while(1){
        // Reading, then checking for newline
        fgets(input, 12, stdin);
    
        if(input[0] == '\n') break;

        // Conversion and test for success
        current_num = strtol(input, NULL, 0);
        if(errno) return -1;

        // The actual task
        if((current_num != 42) && (flag != 1))
             printf("%ld\n", current_num);
        else
            flag = 1;
    }

    return 0;
}

It works just fine on the sample input/output test. I know there’s some extra stuff here, but otherwise it appears to be without any serious quirks. Am I forgetting something really important? I ran tests in console, should I try debugging with a file?

You’re right. Btw, SPOJ’s stdins end with an EOF, but that doesn’t matter because in fact, it’s easier to just stop accepting input after reading 42 altogether. Thank you, have a nice day!