Compilare: main.c: In function 'main': main.c:135:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("menger.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:137:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("menger.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:227:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &t); ^~~~~~~~~~~~~~~ main.c:241:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &level); ^~~~~~~~~~~~~~~~~~~ main.c:243:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i", &x1, &y1, &z1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:245:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i", &x2, &y2, &z2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~