foo.cc: In function 'int getnum1(int)':
foo.cc:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s[x].size();i++){
          ~^~~~~~~~~~~~
foo.cc: In function 'int getnum2(int)':
foo.cc:32:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<s[x].size();i++){
          ~^~~~~~~~~~~~
foo.cc:49:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(i<s[x].size()&&isdigit(s[x][i])){
        ~^~~~~~~~~~~~
foo.cc: In function 'int getnum1(int)':
foo.cc:29:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

自豪的采用jd5进行评测(github.com/masnn/jd5)