Compilare: main.cpp: In function 'void add(trieNode*, std::__cxx11::string, int)': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < c.size(); i++) { ~~^~~~~~~~~~ main.cpp: In function 'int search(trieNode*, std::__cxx11::string, std::ofstream&)': main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < c.size(); i++) { ~~^~~~~~~~~~ main.cpp:68:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != c.size() - 1) curr = curr->child[nr]; ~~^~~~~~~~~~~~~~~