Compilare: user.cpp: In member function ‘int trie::true_push(std::string, trie::node*, int)’: user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘bool trie::true_pop(std::string, trie::node*, int)’: user.cpp:50: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘int trie::count(std::string, int)’: user.cpp:72: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:100: warning: comparison between signed and unsigned integer expressions user.cpp:107: warning: comparison between signed and unsigned integer expressions user.cpp:108: warning: comparison between signed and unsigned integer expressions user.cpp:117: warning: comparison between signed and unsigned integer expressions user.cpp:118: warning: comparison between signed and unsigned integer expressions user.cpp:125: 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:143: warning: comparison between signed and unsigned integer expressions