Compilare: main.c: In function 'main': main.c:15:26: warning: unused variable 'b' [-Wunused-variable] int Sx, Sy, S, N, a, b, x, y, sol; ^ main.c:15:23: warning: unused variable 'a' [-Wunused-variable] int Sx, Sy, S, N, a, b, x, y, sol; ^ main.c:16:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:17:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:20:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &Sx, &Sy, &S, &N); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:23:8: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^~~~~~~~~~~~~~~~~~~~~~