Compilare: main.cpp: In function 'void parse(const std::string&, int&, std::string)': main.cpp:15:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while(i<tree.size() && isalnum(tree[i])){ | ~^~~~~~~~~~~~ main.cpp:24:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | while(i<tree.size() && isalnum(tree[i])){ | ~^~~~~~~~~~~~ main.cpp:29:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while(i<tree.size() && tree[i]!=')'){ | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int i=0; i<paths.size(); i++) | ~^~~~~~~~~~~~~