Compilare: user.cpp: In function 'void readdata()': user.cpp:29: warning: format '%lld' expects type 'long long int*', but argument 2 has type 'int*' user.cpp:29: warning: format '%lld' expects type 'long long int*', but argument 3 has type 'int*' user.cpp: In function 'void solve()': user.cpp:46: warning: operation on 'qb' may be undefined