I have 3 different understandings of the target value:
1. Whole number of bits in all bytes to be changed to make bit substrings equal (any bit(s) of each byte can be changed);
2. The same as p. 1, but only last consecutive bits of byte (suffix) can be changed;
3. The number from the 0..8 range which is the minimum number of bits that can be changed in all bytes.
Tests do not clarify this. Which one is right?