Day 6

input = """
bgdbdsbsbsttldddzzwnzzmpzmmzmqqcgglrglgbbbtmtddrssjtjqqtrtqtqppcvcddswdwbwlblfljfljlhhpchcfcgfcfwfllfccjlcjllbvbgglccznzrnzzvfzvffvzvccnwnnrtrqtttzmmndnqnvvlwvvgcclplccbggcscqscqcnndwdlwlvlffdssrzrtttbvvqttfdfrddhthbblnlmlmqmhhpvpcpwpccmdddbcbcgctggsstwwbcwwqllchlcccfwccvjcjhhvggnvvcssjwjhhdvdhdcdhdqhhwrwcrwcrrjzjccqhhvnnrppsqqplqqcvczzlpprlrqqvpvwwstwwzqqsnqqsrqrlqlggzztzhhvbbcncwnwhwbbqpbqpqdqsqjqrjrddpjpwwvlwlnwwmpwwnmmzgzqqdcdnnqllghhzwhwwggljjwswgwffsbffbggzfzcfzczpptrrnwrrcqqcwqqdttzqzjzqqltlggwlglgwgrgfgnffgqffnlntlnlccjwjfjnfjnffqvfqfcfsslwswfwvfwfvflfhhntngnhggqbbsggchghfggcmgmsggshsmmqffjpjnngwwftwffgqqvmqqslqslqqdzqzhzbhhdzhhllnzzlmzzltlwwsmswwtswtssvqsqhssfdsdtdjdqqqrffqjffrzrppjpgjjpgpmmzbbrcbbprbpbnpbpcpsspqqfggclcpczzngznzvzlvvcwvwcwdwcddhdbdwdhwhllpjllrmmhbmbgmgmpmhpmpqmpprggvsgvsvbsbbqbmmjdjfddsnnqpnnphppsbpsbpsprpjjqhhvrhvvdhdjhdhwdhhdjjrlrbbzhbbjljhllttrccbdbffznnfmnfnvfvrvbblmltlmmlbmmdqmqnmqqmmhchvcvpccnrccqhccshchshzshschcffpwwbdbqbbjhbhmbhmmzzzcscddbsbnnpzpfzzrfrlrmmzzhshbbtjtbtzbbddrwwhchvhtvvmhvmmwssqqzrzdrdqqntnjnrjrbbgqgzgbzgbzgbzgbbqtbbbqjjgvglvlzlqlbbjwjddjtjbjffcsfsnsnpspgpnnglnngrgqgbqgqtgtfggczzmbbvqqrssdqssgrssdzzvjvccbbgcgppgwwtmwwrnwnfwwnnzmzvvvmnnvdddrmrbrtbrbrvrqqcbbgjgfjfcfttgrrjmrmrttbnnsrnsnzsnzztmtgtjgjljdjtjrtrddtbtjbtjbtthhtmmllngnhgnnhthssgffljlnjllfvlvslvsvwvcvfccgqqtsqtqggbjbtjjtjvjtvtvddttqzqczzcvvdtvthvvfrfmrrclrlflbbhhcllfbbcwwgmwmnmpmgpptnpnjpnjjbqjqjddfdfjjpzzjnnvzzwtwpwfppzhphbbmsbmsbmbqqfpfsscttfrtrzzrznrrrbgbdbtdbdjjsmjmttlbtthbttrprpjppsbsjbjcbclchlhhlttntznnzfnfgnncsncnmmdndnlnclnndqnqssbsjbbrzrtzztszzvnznqqpnpbpnpvnpnhpphvpvfvhhrvhrrpttctjcjvcvzcvcscttqptpffscfsccqhchhdcdczcnzcncnhccfrrbprpbpqppdccjhjvjmjpjmpjjvfvrrwppgjgjjdgdmgdggcpccbrrgssbsjbsjsfscfcvvcrvcrcttbtffpqphpchclccwhcwcbwccbzzlvzvffbrbrbjbwjjqvgtcfnhtjvrcwbfjdbvgtqbvmbtscwzrwdfmwtjvswgrvncmftgmppvlcwjpnpffggrmvgtfqgqmhbhpslfwdfvfmbfndrmgfhdbbtdgvnslzpdfvdttqjpcnbzsjcvrprgrhpglwfwtdcbgdsjhnqjntjnsjcgwccjnvvngfpvqwvnclcsvhmwsrccvbjnnrjspwqdvjpfnfvbsslngzpdgjrcsnqfvdlsqdhdllcndshglztgrrjnptqfvllshmhbgdszvmvqdntpgzdvhstgrppwpdtdqvzsfgqfrgmmjqcsjhvrlmnjvfjghlvwbnqcggpqtrjztfzshnqpzznvlqcmnzvrwqlcbnbpwmljpvdzhbvbgtdjlzflsvzlcqdnsgzfjlccvjclqlzdhqzzrscttjmrvjvcqzvtzqlmsssnfcfmvcgmqjjwdnhtvlqrgdvlbbrffmrpnfsmwwwbnwclrgbfnzlbqvjfqjlfvfnfrhdqstddwnwrmsdnvzwfjfgpwcrfqqzbdwwtzprvqtgvtzbttlhcdczlhvlgrbptztswftvnjmgrnbwpfwnztvqmqbznvnllgjmqrwprvwtnptlbfwbblzsblptwpdwgcvwsbmbrtqfvjsbzfvsfvpwfwbnnfcsddhsnwnvvqthjdgvzgjprtqmvhdqjqhgqppqqcpzfcwzcmrslftgrvbvdsdgfzfmvvcqzcszfwdvghdnlwwpddzdsqsdqvvrwhphbqvcbjbtnqgnqqdsqcmrllhmdvpffnqmrgfddjbrjwflshzswvjtmqgqmzvcnlctvdpjhzzlgpzgprjncrscnlmdhvdqpfllsqgstmssvlzmrtjmgwppfqjsrfmlnszdnhngzhtbbnsnvmtzpfsdcsvsvvjnfnzhrzmvlhrbslrsbgwwcvrzpgcnmjqnvgmzmlvpccrmggtzzhsdtbbcdnpdlnbztgjhttmqdhjphcrbgjtctqmgbfmflgqztztcjqvgsscrmwfbvnrnbgbjgqmwdzhwwnddwgrprhvlgftcbnwjqmcgczpbhfqcqzdbdwhmzfmgvcjdsfzdbrzjjvfrvftdblnlhpbqvdprnsjdpznbbgqpgnnjmcnsbszfwblthtwlwrdphjltclmqnbpcgngdnfpltttsrvdmhrcvlqfplqmqvslwgcbrwrmchscczrfgspwjtdqtlbddbsclrlbmhdzqdrgjfsgldfjmgcglbgjhmghntndqcbgqwmdvczbwgcctzvcrsqqctwwddfhhfhwlsrsljpnrlqtbdzprjbfrjgztwbpnfqnlftzcgrpmpcnljhscfbsqzbsgwqcgbvctnhswhrsmwjgcccdsnbscwllmpstpnrccjspnjqmtgcsgbjzpfvzjrhlvnfblqmcmgcrvnpchwhlsqsbhzhsgdvwmdcwphwccvzmmqqjrvqwphbnmddzcmggmbsqrhbcqmdlgvccbhhmhwdjhhhcwnffthmgfhpltqbhnvdqfrzjdvlppqhzfdgbzbrtfllsbvjjcgbwsbcmfrbjtvzqsntzdzprnpmfpfpgmfprlbcdqbdzjsfjbtczdpdnhlwdhmwsjtvmztbhdbbdgvrtbqsqbsnwjjhlslzcblrwlfpzqlvdvmgqhrpjmbjbntmjsjvgsmdsnctlgtnlqgfvhwqbjbrczpfzmzwgvrphfmnnhrlzwzgthzqnzzmptppzdszlcpjjvbpjbtjfrqtbnpnwsdglbbjftvngcghjlnsqwspmmfdpslsmqtpngbtvvrvbqqdsphfhvsnmhprfclnjmfrtqnlqcbmfrggbstwdbwsvtpvflvfgqltmqjpnfclbwtlwhmqrmzcrbztstgpjrdsnwpqrcnvvnnnszlrtpqjtsnbjrdcthrzrtccgcvnnlzfjlcdnzzqclvtncjbznrlpnzhvcwmrfrzpcldfmfzfpchlmddgvcfdqdhzzdtwhsfcvsthtmqgvhzdpjcgwsmrvwsnqmhdnfqdrrnmjwcpjjftfdhvwrwwtvptzfrmgffdcrhvcmccfqctswzzmlsjvdjzgjgndhmmrwvwmmtrnpgsnmtcqdbdpqjmcddcrbcfmmccnvsfhwtvfhsjfmlfttspfghpfggrffnrwjggqwggrmpzscprvdzmzhwjjcsmpsltzwgchttwpngrlptprqnjzzpbpbcvrclggtqwlcwdpjpnjrhtgqwsvhsswwqtlnglnqnvffrgmlbzthvnhrzvsvclgdmmjzrpfv
"""

Part 1

input
|> String.codepoints()
|> Stream.chunk_every(4, 1)
|> Enum.reduce_while(4, fn chunk, pos ->
  deduped = Enum.uniq(chunk)

  if length(deduped) == 4 do
    {:halt, pos}
  else
    {:cont, pos + 1}
  end
end)

Part 2

input
|> String.codepoints()
|> Stream.chunk_every(14, 1)
|> Enum.reduce_while(14, fn chunk, pos ->
  deduped = Enum.uniq(chunk)

  if length(deduped) == 14 do
    {:halt, pos}
  else
    {:cont, pos + 1}
  end
end)