Compilare: main.cpp: In function 'int main()': main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while(pntB < b.size()){ | ~~~~~^~~~~~~~~~ main.cpp:30:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | while(i < nrb2.size() && pntB < b.size()){ | ~~^~~~~~~~~~~~~ main.cpp:30:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | while(i < nrb2.size() && pntB < b.size()){ | ~~~~~^~~~~~~~~~