Compilare: main.cpp: In function 'void insertNode(Trie*, int, std::__cxx11::string)': main.cpp:32:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind==s.size()) ~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:196:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size()<K) ~~~~~~~~~~^~