Compilare: main.c: In function 'init': main.c:103:10: warning: unused variable 'a' [-Wunused-variable] int* a; ^ main.c: In function 'main': main.c:130:16: warning: variable 'out' set but not used [-Wunused-but-set-variable] FILE *in, *out; ^~~ main.c:129:20: warning: unused variable 'instr' [-Wunused-variable] int N, val, i, instr; ^~~~~ main.c:129:17: warning: unused variable 'i' [-Wunused-variable] int N, val, i, instr; ^ main.c:129:12: warning: unused variable 'val' [-Wunused-variable] int N, val, i, instr; ^~~ main.c:133:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &N); ^~~~~~~~~~~~~~~~~~~~