Compilare: main.cpp: In function 'int main()': main.cpp:4:6: warning: unused variable 'fi' [-Wunused-variable] FILE*fi=freopen("dame.in","r",stdin); ^~ main.cpp:5:6: warning: unused variable 'fo' [-Wunused-variable] FILE*fo=freopen("dame.out","w",stdout); ^~ main.cpp:6:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^