/in/foo.cc: In function 'int main()':
/in/foo.cc:20:19: warning: array subscript has type 'char' [-Wchar-subscripts]
   for(int i=T[s[0]];i<strlen(s);i++)
                   ^
/in/foo.cc:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=T[s[0]];i<strlen(s);i++)
                     ~^~~~~~~~~~
/in/foo.cc:21:32: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(s[i]=='-'){x=tdigit(T[s[0]],i-1);y=tdigit(i+1,strlen(s)-1);break;}
                                ^