Compilare: user.cpp: In function ‘int main()’: user.cpp:6:11: warning: unused variable ‘x’ [-Wunused-variable] FILE* x= freopen("par.in","r", stdin); ^ user.cpp:7:11: warning: unused variable ‘y’ [-Wunused-variable] FILE* y=freopen("par.out","w", stdout); ^ user.cpp:10:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:19:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &c); ^