Compilare: main.cpp: In function 'bool check(std::string&, std::string&)': main.cpp:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i=0;i<b.size();++i){ | ~^~~~~~~~~ main.cpp:16:7: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | if(p==a.size()) return 1; | ~^~~~~~~~~~