Compilare: user.cpp: In member function ‘void trie::true_push(std::string, trie::node*, int)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘bool trie::true_pop(std::string, trie::node*, int)’: user.cpp:48: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘int trie::count(std::string)’: user.cpp:75: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘int trie::mult(std::string)’: user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:113: warning: comparison between signed and unsigned integer expressions user.cpp:127: warning: comparison between signed and unsigned integer expressions user.cpp:128: warning: comparison between signed and unsigned integer expressions user.cpp:132: warning: comparison between signed and unsigned integer expressions user.cpp:134: warning: comparison between signed and unsigned integer expressions user.cpp:135: warning: comparison between signed and unsigned integer expressions user.cpp:136: warning: comparison between signed and unsigned integer expressions