Compilare: user.cpp: In function ‘void Add(trie*, int)’: user.cpp:24:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == sir.size()) ^ user.cpp: In function ‘void Erase(trie*, int)’: user.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == sir.size()){ ^ user.cpp: In function ‘int numara(trie*, int)’: user.cpp:59:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == sir.size()) ^ user.cpp:60:35: warning: left operand of comma operator has no effect [-Wunused-value] return ("%d\n", nodcrt -> val); ^ user.cpp: In function ‘int prefix(trie*, int)’: user.cpp:72:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (poz == sir.size() || nodcrt -> son[x] == NULL) return poz; ^