Compilare: main.cpp: In function 'int main()': main.cpp:51:28: 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 index = 0; index <= str2.size() - str1.size(); index++) { | ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~