Compilare: main.cpp: In function 'void addWord(std::__cxx11::string, nod*)': main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'std::__cxx11::string findWord(std::__cxx11::string, nod*)': main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'void addRelevance(std::__cxx11::string, int, nod*)': main.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) { ~~^~~~~~~~~~