Compilare: user.cpp: In function 'void read()': user.cpp:82: warning: format '%u' expects type 'unsigned int*', but argument 2 has type 'long long unsigned int*' user.cpp:84: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int find(long long unsigned int, int, int)': user.cpp:27: warning: control reaches end of non-void function