Compilare: user.c: In function ‘main’: user.c:25:5: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration] work_buffer = (char *)malloc(2048); ^ user.c:25:27: warning: incompatible implicit declaration of built-in function ‘malloc’ [enabled by default] work_buffer = (char *)malloc(2048); ^ user.c:29:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &N); ^ user.c:41:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i]); ^