/in/foo.cc: In function 'void build()':
/in/foo.cc:63:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<temp.size()-1;++i)
               ~^~~~~~~~~~~~~~
/in/foo.cc:64:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=i+1;j<temp.size();++j)
                  ~^~~~~~~~~~~~
/in/foo.cc:68:17: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
     int wt=(x&y)+(x^y)<<1;
            ~~~~~^~~~~~
/in/foo.cc:86:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<temp.size();++i)
                ~^~~~~~~~~~~~
/in/foo.cc:90:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     int r=temp[(i+1>temp.size()-1?0:i+1)]-'0';
                 ~~~^~~~~~~~~~~~~~
/in/foo.cc:111:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<=temp.size();++i)
               ~^~~~~~~~~~~~~
/in/foo.cc:114:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    int r=temp[(i>temp.size()-1?0:i)]-'0';
                ~^~~~~~~~~~~~~~
/in/foo.cc:120:45: 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)
                            ~~~~~~~~~~~~~~~~~^~~~~~~~