sidef-scripts/Games/crack_the_code.sf at master · trizen/sidef-scripts · GitHub

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#!/usr/bin/ruby

# Crack the code?
# A numeric lock has a 3 digit key.

# Hint:
#   682 - one number is correct and well placed
#   614 - one number is correct but wrongly placed
#   206 - two numbers are correct but wrongly placed
#   738 - nothing is correct
#   780 - one number is correct but wrongly placed

for n in (0 .. 999) {

    var s = sprintf("%03s", n)

    # Hint 1
    s ^ "682" -> count("\0") == 1 || next

    # Hint 2
    s ^ "614" -> count("\0") == 0 || next
    s.count(/[614]/) == 1         || next

    # Hint 3
    s ^ "206" -> count("\0") == 0 || next
    s.count(/[206]/) == 2         || next

    # Hint 4
    s =~ /[738]/ && next

    # Hint 5
    s ^ "780" -> count("\0") == 0 || next
    s.count(/[780]/) == 1         || next

    say s
}