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p 2**38
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riddle = "g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj."
riddle.scan(/./).each do |char|
if /[a-z]/ =~ char
print (?a + (char[0] - ?a + 2) % 26).chr
else
print char
end
end
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ÔÙ¶Ôurl ("map")ʵʩ±ä»»µÃ"ocr"¡£
update: ·¢ÏÖStringÓиöÄÚÖÃÌæ»»º¯Êýtr()¡£¿´£¬¶à¼ò½à¡£
class String
def rot2
self.tr("a-xyz","c-zab")
end
end
p riddle.rot2
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riddle = '...' # the mess here
count = Hash.new(0)
seq = []
riddle.scan(/./).each do |char|
seq << char if count[char] == 0
count[char] += 1
end
p count, seq
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system(command) -> exit_status
Execute the command (a string) in a subshell.
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