运行 ID: 20846

Main.cc: In function ‘std::__cxx11::string add(std::__cxx11::string, std::__cxx11::string)’:
Main.cc:6:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(a1.size()=0;i--){
            ^~
Main.cc:8:12: note: suggested alternative: ‘i’
  for(int i=ai.size()-1;i>=0;i--){
            ^~
            i
Main.cc: In function ‘int main()’:
Main.cc:19:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d,%d",&k,&m);
  ~~~~~^~~~~~~~~~~~~~~