Compilare: user.cpp: In function ‘bool subsir_comun(std::string, std::string)’: user.cpp:9: warning: comparison between signed and unsigned integer expressions user.cpp:10: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:41: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:38: warning: unused variable ‘j1’ user.cpp: In function ‘bool subsir_comun(std::string, std::string)’: user.cpp:19: warning: control reaches end of non-void function