Compilare: main.cpp: In function 'int main()': main.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i = 1; i < b.size()-a.size()+1; i++){ | ~~^~~~~~~~~~~~~~~~~~~~~