defmodule Policy do
  defstruct range: nil, letter: nil
  def parse(str) do
    [range_str, letter] = str |> String.split(" ", trim: true)
    [first, last] = String.split(range_str, "-") |> Enum.map(&String.to_integer/1)
    %Policy{range: Range.new(first, last), letter: letter}
  end
end
defmodule PasswordAndPolicy do
  defstruct policy: %Policy{}, password: ""
  def parse(str) do
    [policy_str, password] = String.split(str, ": ", trim: true)
    policy = policy_str |> Policy.parse()
    %PasswordAndPolicy{password: password, policy: policy}
  end
  def in_range(i, r) do
    Enum.member?(r, i)
  end
  def validate_old(%PasswordAndPolicy{policy: policy, password: password}) do
    String.graphemes(password)
    |> Enum.frequencies()
    |> Map.get(policy.letter)
    |> in_range(policy.range)
  end
  def validate_new(%PasswordAndPolicy{policy: policy, password: password}) do
    [
      String.at(password, policy.range.first - 1),
      String.at(password, policy.range.last - 1)
    ]
    |> Enum.count(&(&1 == policy.letter)) == 1
  end
end
File.read!("input")
|> String.split("\n", trim: true)
|> Enum.map(&PasswordAndPolicy.parse/1)
|> Enum.filter(&PasswordAndPolicy.validate_old/1)
|> Enum.count()
|> IO.inspect(label: "part one")
File.read!("input")
|> String.split("\n", trim: true)
|> Enum.map(&PasswordAndPolicy.parse/1)
|> Enum.filter(&PasswordAndPolicy.validate_new/1)
|> Enum.count()
|> IO.inspect(label: "part two")

1-9 x: xwjgxtmrzxzmkx
4-6 r: rrrkrgr
4-5 v: vvfvvvn
5-16 m: pxmrtmbmqmcldmmm
15-16 s: bsshsszslssssslqdsss
10-12 g: gggggggggzgvg
2-7 n: dntnrng
11-14 j: xrjflbmjszzjbjjh
2-6 r: frxrrrfjnmr
6-7 h: hplhgcsphh
4-5 w: wwwwz
1-6 g: ggdggnggg
3-4 c: cccc
5-8 k: kjgmkkfwxkwqkkgfnv
14-15 h: xpwhdjhhjhrdjkhfh
6-7 g: vgggggdhgsp
1-3 r: rtdcrthphrkzxh
15-16 j: jjjjjjstjjjjhjjjjj
8-10 k: kkkkpkkqkv
1-4 s: sssssj
2-3 d: hdbmbpswddwkkr
6-7 s: ssscssnss
8-9 z: zzzzzzzftz
7-8 t: glwvkgtn
3-10 n: nnnnnnnnnnn
5-7 z: lzzzzfhj
8-9 l: llllllltn
1-2 p: dpcppp
2-5 d: hcfdltbgt
13-16 r: rrdrrqrrrrrsbrrr
7-16 l: lllltllllllllllllrll
9-14 z: vzzzpzfzdzzzzzzfczz
3-5 f: ffffb
6-8 s: csssssjrbdsgs
9-18 r: rrrrrrbrrrjzdrrrcrr
2-5 d: fdzxdj
13-14 c: cclcccccccccmc
9-10 z: zzvszszjbnzzz
5-9 s: ssqshwsss
4-11 x: hxxxxjvdxcqplp
4-6 t: mxtrtttttttttt
3-8 w: wmwwwnbmtw
5-6 x: xsczxd
2-7 w: pwvtgkwwwrpjr
7-9 w: wwwwwwwwj
3-9 h: hhhhbhhhschhh
1-4 p: tlwx
4-5 w: lhzjwwwwmv
6-7 p: ppppglprp
2-16 m: jqmmmmmzmmmmmjmbxmw
8-10 g: zhggpgrrlctggg
7-18 z: pltbcznlvtzgzczzchbz
10-11 t: jttttgtttttt
3-8 k: kkkkkkkkkkk
19-20 x: xxxxxxxxxxxxxxxxxxwr
9-16 l: llllllflllllxpllzl
10-12 m: mmjmmmmmmvms
1-4 c: cdxvxczcc
7-10 n: nnnnfnvpncn
10-17 z: zszzzrzczxzfzzzzlz
4-9 k: kkkdkkkkfk
12-13 m: mmgmmqfgmmtmm
4-6 s: tdmmcs
10-16 n: nkfpnncncnnntmtc
2-3 w: vwhwf
7-17 w: wwfwwwqhwwwwcwwww
5-8 q: tkqrtqqsqkwq
9-10 p: ptpppppppd
1-5 f: cnncnmnf
2-9 k: kkjdsnsqkgprtqb
9-11 n: nplnnnnnnnmnn
4-6 r: rrkrzrr
3-5 z: zzzzsq
17-18 r: rrrrrrrrrrrrrrrrrx
5-8 c: rcccdcclc
1-9 c: vcccccccbc
9-10 x: xxxxcbxxxm
2-5 c: cccfn
8-9 c: cccccnctc
4-8 l: flrhfzwllm
1-5 l: fllfllrklx
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5-10 v: dsxvmvvjtsc
4-6 v: bsqvdghvnzdfvjcfvvv
6-11 m: mmmmmmmmmmpm
6-9 q: qqgqkcccsgqqjspj
2-5 n: nvsrc
14-15 n: nnnnnnnnnnnbnms
3-4 m: mmbm
3-11 h: hhbhhhhhhhhhhhhhhhh
7-9 k: kkkkbknkjv
11-15 g: ggvgggfgbgvvzjgxghgg
3-4 z: zzzz
2-5 w: wwwhww
9-14 j: jjjjjjjjtjjjjw
2-4 j: jjbljsj
6-9 w: bwtkbttwqvwk
1-3 l: lllpjl
9-10 g: ggfmggggsrggggg
3-5 t: ttwzxl
5-7 k: kkwtbckkk
9-11 r: rbgrrhrrrrrr
9-12 g: ggggggsggglnggg
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6-7 m: xkjmdmm
6-8 g: gggggwgw
12-15 v: vrvvvqvvpvzvvvvrhqv
15-17 s: hsnjsrsdxpjswsxsss
9-12 r: rnhnrrsrrrrr
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1-11 m: mmtxkcdrvcmx
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5-9 h: vfxhhshhvhhbhr
2-3 k: wtrcckttcqrj
2-7 q: wnqcqqxw
1-9 s: sqsssslsssssssssss
4-6 p: mwvpppzp
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15-20 d: dddddzddddddddlddddt
11-15 m: fvsqwbnqmbnmgcm
3-4 c: fncnfdjzcxwbpcrn
4-7 z: jsxzzszzqtwzmcznfs
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5-13 b: pdbvhwjwnbdwbrbbjwf
7-8 h: hhthhhvvt
8-11 f: pfffffxffpbf
5-6 n: ndtlxnnnqdmcnv
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15-16 s: ssssssssssqsssss
4-5 s: sssss
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3-4 c: ccjv
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10-13 k: kkkksjkkskqtkkmkknks
4-9 f: fffwfffbkc
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8-11 m: mmmmmmrmmmm
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2-5 p: wppxkq
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5-11 q: qvqqqqxqqqqfqqq
8-12 q: qqqqqqqvqqqq
8-10 m: mmmmmmmjmn
17-18 t: ttttrttttsttttttttt
9-13 h: hhhhhqhjlvhhqhhwh
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9-10 v: qvvtvsvcmzvvnpgvv
7-12 d: djcpndppsdddfdsdd
2-3 z: dgzwvbrzzbgw
1-4 k: kwkl
1-9 d: dkdmdsdwdzvlpv
10-11 h: hhhhhhhhhhh
9-10 f: ffffffffff
4-7 d: ssddddxp
18-19 j: jjjjjjjjjjjjjjjjjsj
7-11 m: mkmmrmmlrzsmgm
1-7 k: kkkkkkknk
4-5 w: wwwwj
6-13 s: xslmsfgsssssmslsstqd
4-5 z: zzzch
9-11 j: jjjjjjjjjjj
4-7 h: hjhhkdh
5-14 v: vvvvglvvdvvvvv
5-6 q: shqnjdqqq
1-5 q: dqqqq
5-7 z: zzznzzz
5-9 s: vwsfsxssd
4-5 f: sffffv
5-7 b: xllbbdb
1-14 j: rtzjqkpnkjlrhjcjqj
8-10 w: wwwwwwwfwxz
3-6 g: sggtlggswf
11-14 n: nnbnnncnnsgnnmknn
6-15 c: cclcnccctcrcxqmd
5-8 l: lmllxwpl
4-11 p: pppppppcpkdp
1-4 w: zwwx
1-3 g: nlfpgfzqkzn
11-12 w: vbwwgwvwrwlwwmwwwjw
4-12 j: vzfjgjrkzdrxqfh
1-2 r: frrq
1-4 k: vkkkkk
11-13 d: pndlftgdpdhld
1-4 r: prrvrrrrfrrrrr
8-9 m: fmmxmmmmmmm
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2-10 g: fkzwxtqmgm
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4-5 m: mzmmxcfwmdpz
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7-10 r: rdlrrrrrrr
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6-7 m: mmmmmmmm
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5-17 f: ffffsfffftfffkffn
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5-6 p: ppjbpnppxg
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6-7 l: llflrhlllgklh
1-2 p: tppp
16-17 g: gggggggvggggggggg
3-14 f: fhfdffftfbggpkfgf
16-18 b: bbbbbbbbbbbbbbbbbbbb
5-10 v: thqvvkvlwvdvjzzst
13-14 p: ppppppppppppptc
11-14 t: tkttczttttsttmcnltm
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4-6 f: fpflfwftk
4-6 h: xhhhhh
15-17 t: tttttttttttttttlv
10-17 j: jjjjjjjjjsjjjjjjd
2-4 s: jcgs
7-9 q: qsqqjhqndsqkqqpvqqr
2-3 p: tnpplcmdpfn
2-5 c: crvmk
1-7 d: tsmzcgddnddddrdxsq
8-9 c: rlfcpctpncv
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13-15 s: sssmsscfvsssdsg
6-8 s: ssjsssjrscsss
7-10 f: fffffffkfff
1-6 k: jqtdhpknkkk
11-12 t: tttttttttttf
9-16 d: swjbddfpfbntmprdd
18-19 v: dvvvvvvvvvvvvvvvkvvv
2-5 j: kjjcqjj
11-12 d: dddddddcddld
14-16 f: fffffffffffffffk
4-7 x: nxxxxxxn
10-18 p: pppppppppppppppppr
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4-9 x: wxpvxxxfxfxx
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2-6 h: bhvwhl
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