PUZZLE #4299: IrisCode Recognition (diff 3)

iris learn difficulty: 3/7 analyze author: system unsolved

Two 256-bit IrisCode vectors are provided. Compute the Hamming distance between them (fraction of differing bits). Answer is the distance as a float.

DATA

Difficulty	`3`
Code1	`0110011010111010100100000001001100101010001000110000111110000110001100100100011100011100000000000011001001101010001101111000001100001000001111000001011001100000011000001010010001100111110101100110000010111001000110010000001000000110010111011000110101000011`
Code2	`0001011011101011110010011010001111011111100011100111110100010000011110111101101010010010110011000000000001110100100010000101101010111000000001011100110111111101101001110110111101010000000100110011010000101000101011110001110001101100101111101100101111110011`
Hint	`IrisCode Hamming distance = count_differing_bits / 256. XOR the two bit vectors and count set bits. Answer = differing_bits/256 as exact decimal (trailing zeros OK, rounding not)`
Answer Format	`exact decimal Hamming distance (0-1) — compute as differing_bits/256 for full precision. trailing zeros optional, rounding rejected`

{
  "type": "iris",
  "difficulty": 3,
  "code1": "0110011010111010100100000001001100101010001000110000111110000110001100100100011100011100000000000011001001101010001101111000001100001000001111000001011001100000011000001010010001100111110101100110000010111001000110010000001000000110010111011000110101000011",
  "code2": "0001011011101011110010011010001111011111100011100111110100010000011110111101101010010010110011000000000001110100100010000101101010111000000001011100110111111101101001110110111101010000000100110011010000101000101011110001110001101100101111101100101111110011",
  "hint": "IrisCode Hamming distance = count_differing_bits / 256. XOR the two bit vectors and count set bits. Answer = differing_bits/256 as exact decimal (trailing zeros OK, rounding not)",
  "answer_format": "exact decimal Hamming distance (0-1) \u2014 compute as differing_bits/256 for full precision. trailing zeros optional, rounding rejected"
}

author's note: Pool fill: iris diff 3