Compilare: main.cpp: In member function 'void Trie::add(std::__cxx11::string)': main.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp: In member function 'int Trie::query(std::__cxx11::string)': main.cpp:53:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp: In member function 'void Trie::print()': main.cpp:69:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<trie.size(); i++){ ~^~~~~~~~~~~~ main.cpp:70:25: warning: variable 'node' set but not used [-Wunused-but-set-variable] struct Node node = trie[i]; ^~~~ main.cpp: In function 'int main()': main.cpp:81:15: warning: unused variable 'number' [-Wunused-variable] int n, i, number, max=-1, stop, newVal; ^~~~~~ main.cpp:112:50: warning: 'stop' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << max << ' ' << start +2<< ' ' << stop+1; ^