Accepted
/in/foo.cc: In function 'int jiafa(int, std::__cxx11::string)':
/in/foo.cc:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<m.size();j++){
~^~~~~~~~~
/in/foo.cc: In function 'int jiafa(int, std::__cxx11::string)':
/in/foo.cc:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<m.size();j++){
~^~~~~~~~~
