hackerrank default file

hacker_rank.c

//Online version needs this define. But it gets defined twice on the local machine
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <stdio.h>      /* printf, fgets */
#include <stdlib.h>     /* atoi */

int main() {

#ifdef OFFLINE
    FILE *fp=fopen("stdin.txt", "r");
#else
    FILE *fp=stdin;
#endif

    char *line = NULL;
    size_t size;

    //Read the first line to know the number of iterations
    getline(&line, &size, fp);
    int num_lines = atoi(line);
    free(line);

    //Loop over each iteration
    for(int i=0; i<num_lines; ++i) {

        getline(&line, &size, fp);
        long int num_cuts = atol(line);

        unsigned long long int max = (num_cuts/2)*(num_cuts-(num_cuts/2));

        printf("%llu\n",max);
    }

    return 0;
}