View Compilation Error

0_0_16539491_22863.cpp: In function 'int count(const bint&)':
0_0_16539491_22863.cpp:592:21: error: inconsistent deduction for 'auto': 'unsigned int' and then 'long long unsigned int'
   rep(i, 0u, s.size()) ret += s[i] - '0';
                     ^
0_0_16539491_22863.cpp:18:39: note: in definition of macro 'rep'
 #define rep(i,a,b) for(auto i=a,i##_n=b;i<i##_n;++i)
                                       ^