Compilare: main.cpp: In function 'void solve()': main.cpp:9:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for(int i = 0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:12:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | if(cnt_0 <= cnt_1)for(int i = 0;i<a.size();i++)fout << 0; | ~^~~~~~~~~ main.cpp:13:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | else for(int i = 0;i<a.size();i++)fout << 1; | ~^~~~~~~~~