Compilare: user.cpp: In function ‘void generatePrefix(std::string&, int)’: user.cpp:35:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < b.size(); i++) ^ user.cpp: In function ‘int getPrefix(std::string&, std::string&, int, int)’: user.cpp:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.size(); i++) ^ user.cpp:66:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == b.size() - 1) ^ user.cpp:74:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:131:29: warning: unused variable ‘lPrefix’ [-Wunused-variable] int lPrefix = aux[w[i]][w[j]]; ^