https://www.infoarena.ro/job_detail/491113?action=view-source

#include <stdio.h>

#define infile "sort4.în"
#define outfile "sort4.out"

FILE *fin, *fout; // inainte de main

fin = freopen(infile, "r", stdin); // main
fout = freopen(outfile, "w", stdout);


// citire si print
scanf("%d", &n);
printf("%d ", n);