Compilare: main.cpp: In function 'void add(std::string, int, int)': main.cpp:19:15: 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(indice == s.size()){ | ~~~~~~~^~~~~~~~~~~ main.cpp: In function 'void stergere(std::string, int, int)': main.cpp:32:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(indice != s.size()){ | ~~~~~~~^~~~~~~~~~~ main.cpp: In function 'void check(std::string, int, int)': main.cpp:41:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if(indice == s.size()) | ~~~~~~~^~~~~~~~~~~ main.cpp: In function 'void check1(std::string, int, int, int)': main.cpp:53:41: 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(!v[nod1].fr[s[indice]] || indice == s.size()) | ~~~~~~~^~~~~~~~~~~