Compilare: main.cpp: In function 'int main()': main.cpp:14:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for (int i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:20:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for (int i=1;i<a.size();i++) | ~^~~~~~~~~ main.cpp:24:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int i=1;i<=b.size()-a.size();i++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp:29:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int i=0;i<=b.size()-a.size();i++) | ~^~~~~~~~~~~~~~~~~~~ main.cpp:42:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int i=0;i<=b.size()-a.size() && x<=1000;i++) | ~^~~~~~~~~~~~~~~~~~~