zhuolaobanmimatiaozhan

decipher.rb

encoded_text = <<-MSG
snmft
ltslcnsnonjhmzemjizfsbjsenijmfsdn
cnfrnfsbtdftonftljnsndnljwjsbz
emndtzsnbfshmjslqjemjljwjsbz
hfndtzonmznmztijonfsluns
efnrnrfczjpjhmjslemtsl
btrjshmzqjczjcnqjifqnfslonfrnmjonjrnijemnxmn
mfnqnftonjqjxmnljemzrnslijrnrfczjwjsbzyfrjsljozkjsllj
dtzcnjwjsxznwfsefteftonzvzxmnqjifsqnzcnfqjgftlznijxmzczjhmjsllzt
dtzcnjwjsdtslonsgnxmjslonslqn
dfsonzlzfnoncnfslcnslbjsen
eznemtslutdnqjyf
wfslwjsrjshmtslcnsizitslqjkfqftijmzf
jwbtcnfslvnslsnynfthmzdnljsneznlfscnslvzijrnrfczjwjsbz
gnslljnhmzsnijqndtzdnxmfslonzxmnvzfsgzwjsbz
emzsnmftdzs
MSG

ord_to_letter = ('a'..'z').map.with_index(1) { |c, i| [c, i] }.to_h

old_stdout = $stdout
$stdout = StringIO.new

ords_of_encoded = encoded_text.chars.map { |c| ord_to_letter[c] }

offset = 5

decoded =
  ords_of_encoded.map do |ord|
    if ord.nil?
      "\n"
    else
      moved = (ord - offset) % 26
      real_ord = moved == 0 ? 26 : moved % 26
      ord_to_letter.key(real_ord)
    end
  end.join

$stdout = old_stdout

puts decoded

# 此行及以下内容不要复制 ---------------------------------------------------------

# 解出的拼音原文和中文

# nihao
# gongxinijiechuzheduanwenzidehanyi
# xiamianwoyaojiaogeiniyigerenwu
# zhiyouniwanchenglezhegerenwu
# caiyoujihuihuodejiangpin
# zaimimaxuekechengzhong
# womenchulexuexiledaliangjiamihejiemidezhishi
# hailiaojieleshigezhumingdemimaxuerenwutamengejufengge
# youxierensuiranzaozaojiuqushiledanliuxialebaoguideshuxuechengguo
# youxierenyongjinbishengjingli
# yanjiuguaijixiangxingwenzi
# zuizhongpoyileta
# rangrenmenchongxindudonglefalaodehua
# erwoxiangqingnitiaochuyigenizuiganxingqudemimaxuerenwu
# binggeichunideliyouyishangjiushiquanburenwu
# zhunihaoyun
#
# 你好
# 恭喜你解出了短文的含义
# 西面我要交给你一个任务
# 只有你完成了这个任务
# 才有机会获得奖品
# 在密码学课程中
# 我们除了学习了大量加密和解密知识
# 还了解了十个著名的密码学人物，他们各具风格
# 有些人虽然早早就去世了但留下了宝贵的数学成果
# 有些人用尽毕生精力
# 研究古埃及象形文字
# 最终破译了它
# 让人们重新读懂了法老的话
# 而我想请你挑出一个你最感兴趣的密码学人物
# 并给出你的理由，以上就是全部任务
# 祝你好运