Compilare: user.cpp: In function ‘int getPrefix(std::string&, std::string&, int, int)’: user.cpp:45:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < b.size(); i++) ^ user.cpp:59:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.size(); i++) ^ user.cpp:70:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == b.size() - 1) ^ user.cpp:93:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:202:29: warning: unused variable ‘lPrefix’ [-Wunused-variable] int lPrefix = aux[w[i]][w[j]]; ^