Compilare: user.cpp:51:2: warning: no newline at end of file user.cpp:3: warning: ISO C++ forbids declaration of 'main' with no type user.cpp: In function 'int main()': user.cpp:35: warning: format '%lld' expects type 'long long int*', but argument 3 has type 'long int*' user.cpp:6: warning: unused variable 'x' user.cpp:6: warning: unused variable 's' user.cpp:6: warning: unused variable 'sp' user.cpp:6: warning: unused variable 'valid'