Compilare: main.cpp: In function 'int main()': main.cpp:31:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp:34:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | rg[i] = (i + 1 < a.size() && a[i] == a[i+1] && a[i] == '1') + rg[i + 1]; | ~~~~~~^~~~~~~~~~