Compilare: main.cpp: In function 'void add(nod*, const std::string&, int)': main.cpp:15:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | if (pos == w.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'void erase(nod*, const std::string&, int)': main.cpp:27:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | if (pos == w.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'int queryap(nod*, const std::string&, int)': main.cpp:40:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | if (pos == w.size()) { | ~~~~^~~~~~~~~~~ main.cpp: In function 'int querylg(nod*, const std::string&, int)': main.cpp:50:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if (pos == w.size()) | ~~~~^~~~~~~~~~~