Compilare: main.cpp: In function 'void ins(node*, std::string, int)': main.cpp:19:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | if( i >= s.size() ) { | ~~^~~~~~~~~~~ main.cpp: In function 'int del(node*, std::string, int)': main.cpp:31:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if( i >= s.size() ) { | ~~^~~~~~~~~~~ main.cpp: In function 'int aparitii(node*, std::string, int)': main.cpp:47:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | if( i >= s.size() ) | ~~^~~~~~~~~~~ main.cpp: In function 'int prefcom(node*, std::string, int)': main.cpp:55:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if( i >= s.size() ) | ~~^~~~~~~~~~~