Compilare: main.cpp: In function 'void Add(Node*, int)': main.cpp:25:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | if( i == s.size() ) | ~~^~~~~~~~~~~ main.cpp: In function 'void Delete(Node*, int, bool&)': main.cpp:39:11: 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( i == s.size() ) | ~~^~~~~~~~~~~ main.cpp: In function 'int Search(Node*, int)': main.cpp:58:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | if( i == s.size() ) | ~~^~~~~~~~~~~ main.cpp: In function 'int Query(Node*, int)': main.cpp:66:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | if( i == s.size() ) | ~~^~~~~~~~~~~