Compilare: main.cpp: In function 'void addTrie(std::__cxx11::string&, int, Trie*)': main.cpp:27:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == s.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'void delTrie(std::__cxx11::string&, int, Trie*)': main.cpp:40:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == s.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'int freq(std::__cxx11::string&, int, Trie*)': main.cpp:50:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == s.size()) ~~~~^~~~~~~~~~~ main.cpp: In function 'int prefix(std::__cxx11::string&, int, Trie*)': main.cpp:60:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == s.size()) ~~~~^~~~~~~~~~~