/in/foo.cc: In function 'void build()':
/in/foo.cc:65:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for( int i=0;i<=temp.size();++i)
                ~^~~~~~~~~~~~~
/in/foo.cc:68:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     int r=temp[(i>temp.size()-1?0:i)]-'0';
                 ~^~~~~~~~~~~~~~
/in/foo.cc:74:45: 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:88:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i==temp.size())
       ~^~~~~~~~~~~~~
/in/foo.cc:90:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for( int j=i+1;j<temp.size();++j)
                   ~^~~~~~~~~~~~
/in/foo.cc:94:18: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
      int wt=(x&y)+(x^y)<<1;
             ~~~~~^~~~~~
/in/foo.cc:117:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      int r=temp[(i+1>temp.size()-1?0:i+1)]-'0';
                  ~~~^~~~~~~~~~~~~~