Описание тега hamming-distance
The Hamming distance is a mathematical distance function for a pair of strings (sequences) that can be computed with a binary calculation. It counts the number of symbols in the string that are different. Posts that are not about implementation may belong on https://math.stackexchange.com.
For the special case of two binary strings, it may be implemented as the bitcount of their XOR:
int H(int a, int b){
return popcount(a^b);
}