Compilare: user.cpp: In function ‘void cheie(std::string&)’: user.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size (); ++i) ^ user.cpp:28:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size (); ++i) ^ user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i; j < str.size (); ++j) ^ user.cpp: In function ‘void add(int, trie*)’: user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == str.size ()) ^ user.cpp: In function ‘int fin(int, trie*)’: user.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ind == str.size ()) return (p -> stop); ^