Compilare: main.cpp: In function 'int main()': main.cpp:20:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i = 0;i < s.size();i++) { | ~~^~~~~~~~~~ main.cpp:22:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int j = i;j < i + 20 && j < s.size();j++) { | ~~^~~~~~~~~~