运行 ID: 21196

Main.cc: In function ‘std::__cxx11::string add(std::__cxx11::string, std::__cxx11::string)’:
Main.cc:5:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(a1.size()}’ requested
  string r='1';
           ^~~
Main.cc: In function ‘int main()’:
Main.cc:25:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d,%d",&k,&m);
  ~~~~~^~~~~~~~~~~~~~~