/in/foo.cc: In function 'void build()':
/in/foo.cc:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(register int i=0;i<=temp.size();++i)
                        ~^~~~~~~~~~~~~
/in/foo.cc:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    register int r=temp[(i>temp.size()-1?0:i)]-'0';
                         ~^~~~~~~~~~~~~~
/in/foo.cc:70:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(new_string.empty()||new_string.size()>max_len)//||new_string.size()!=temp.size()+1)
                            ~~~~~~~~~~~~~~~~~^~~~~~~~
/in/foo.cc:84:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i==temp.size())
       ~^~~~~~~~~~~~~
/in/foo.cc:86:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(register int j=i+1;j<temp.size();++j)
                           ~^~~~~~~~~~~~
/in/foo.cc:90:26: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
     register int wt=(x&y)+(x^y)<<1;
                     ~~~~~^~~~~~
/in/foo.cc:109:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(register int i=0;i<temp.size();++i)
                         ~^~~~~~~~~~~~
/in/foo.cc:113:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     register int r=temp[(i+1>temp.size()-1?0:i+1)]-'0';
                          ~~~^~~~~~~~~~~~~~