Compilare: user.cpp: In function ‘void adauga(int, Trie*)’: user.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) { ^ user.cpp: In function ‘bool sterge(int, Trie*)’: user.cpp:36:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ^ user.cpp: In function ‘int nrAparitii(int, Trie*)’: user.cpp:53:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size()) ^ user.cpp: In function ‘int lungimePrefix(int, Trie*, int)’: user.cpp:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == s.size() || lista -> fiu[s[index]-'a'] == NULL) ^