Compilare: main.cpp: In member function 'void TrieNode::Insert(std::string&, int)': main.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | if (depth == str.size()) | ~~~~~~^~~~~~~~~~~~~ main.cpp: In member function 'void TrieNode::Delete(std::string&, int)': main.cpp:39:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | if (depth == str.size()) | ~~~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int TrieNode::GetFrv(std::string&, int)': main.cpp:53:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if (depth == str.size()) | ~~~~~~^~~~~~~~~~~~~ main.cpp: In member function 'int TrieNode::GetPrefixLen(std::string&, int)': main.cpp:71:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | if (depth >= str.size()) { | ~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:99:9: warning: unused variable 'i' [-Wunused-variable] 99 | int i = 0; | ^