Compilare: main.cpp: In function 'void generatePrefix(std::__cxx11::string&, int)': main.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < b.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int getPrefix(std::__cxx11::string&, std::__cxx11::string&, int, int)': main.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp:75:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k == b.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:83:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:140:29: warning: unused variable 'lPrefix' [-Wunused-variable] int lPrefix = aux[w[i]][w[j]]; ^~~~~~~