# ╔═╡ c7dcdae0-33b1-11eb-2cab-fbc06c8ef76b
md"**Result for part 2:** $(day1_part2(input_day1))"
+# ╔═╡ 5d9712b0-3472-11eb-1423-719331dfe52f
+md"## Day 2"
+
+# ╔═╡ b9144990-3473-11eb-0ba9-59f3fe6ddbc0
+struct Password
+ policy_range :: UnitRange
+ policy_char :: Char
+ p :: String
+end
+
+# ╔═╡ 10f5ffa0-3474-11eb-2a36-d5c6f78f18c6
+function parse_day2(input :: String) :: AbstractArray{Password}
+ line_regexp = r"^(\d+)-(\d+) ([a-z]): ([a-z]+)$"
+ result = Array{Password, 1}()
+ for line ∈ split(input, '\n')
+ m = match(line_regexp, line)
+ push!(
+ result,
+ Password(
+ UnitRange(parse(Int64, m.captures[1]), parse(Int64, m.captures[2])),
+ m.captures[3][1],
+ m.captures[4]
+ )
+ )
+ end
+ result
+end
+
+# ╔═╡ 6695038e-3472-11eb-1846-3b1c041be59d
+function nb_of_valid_passwords_part1(passwords :: AbstractArray{Password})
+ sum(
+ function (password)
+ m = 0
+ for c in password.p
+ m += c == password.policy_char
+ end
+ if m ∈ password.policy_range 1 else 0 end
+ end,
+ passwords
+ )
+end
+
+# ╔═╡ bbda1c1e-347a-11eb-0e7a-756906c4c9f4
+function nb_of_valid_passwords_part2(passwords :: AbstractArray{Password})
+ sum(
+ password ->
+ (password.p[password.policy_range.start] == password.policy_char) ⊻
+ (password.p[password.policy_range.stop] == password.policy_char),
+ passwords
+ )
+end
+
+# ╔═╡ a0cfb670-3474-11eb-1a05-c12914658a0a
+let
+ test1_input = "1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc"
+
+ test1_part1_result = nb_of_valid_passwords_part1(parse_day2(test1_input))
+ test1_part2_result = nb_of_valid_passwords_part2(parse_day2(test1_input))
+
+ md"
+Test 1, part 1: $(test1_part1_result == 2)
+
+Test 1, part 2: $(test1_part2_result == 1)
+ "
+end
+
+# ╔═╡ 2b112350-347a-11eb-1725-5f70e3623379
+input_day2_raw = "1-13 r: gqdrspndrpsrjfjx
+5-16 j: jjjjkjjzjjjjjfjzjjj
+14-16 r: rrrnrrrrrcnrgxrr
+1-3 k: bkktwhgktv
+3-5 q: dxqqqzmqvs
+11-14 s: sssssssssssssv
+1-3 d: cdzdq
+13-16 q: scdqpdgpkvbwwqbv
+9-10 d: ddrdddlddd
+15-17 v: jvvvvvvgcvvvvrcvnv
+2-3 s: xssx
+8-15 j: jwjjjjkhjjjltjmjjjr
+7-15 m: wqspfmtpjftmplwp
+1-11 s: swdgzhgsxtssndzfm
+3-4 b: bgjrg
+1-12 x: jxgxxxpjwpsht
+5-15 x: xxjxwshpxjxxxxsnxvz
+4-11 r: bjnrpswfprrng
+12-14 j: wjjzmwnmmvzsjhnnkj
+3-4 d: dddv
+2-4 b: bfxx
+15-16 r: rrrrrrrrrrrlrrphrr
+6-11 j: jsljjjjjjjj
+6-7 m: mpttcmmmmng
+6-7 g: gsggggg
+2-10 b: nbtbqbbfpb
+4-6 h: hhqhrzkcrhh
+13-14 b: bbbbbbbbbbnbbbb
+5-6 g: gggggg
+5-6 x: rsxvxx
+3-6 q: wxqzqqqtzsq
+1-2 h: sjhj
+6-18 t: jtptcwtbfgffpkdwthbf
+5-9 w: wwwwcwwww
+15-16 g: wqdwztbmrqdmgmvc
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+1-3 c: ctpr
+2-8 d: dzdfsddd
+10-14 c: ccccczcccccqlchvclcc
+2-8 s: sscwcfssssssdt
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+3-4 f: fflf
+7-13 s: ssssssssscsssjs
+2-3 t: twlcfmbmbxtt
+4-6 v: vdvhvf
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+13-14 r: wrrvrvrtrrrrrrrrrrr
+1-3 b: sjvfpdrbcnwr
+1-7 z: xzzzzwjz
+6-14 j: jfrxjjjrqcqjwmbfjjjm
+11-14 f: ffffffffffqffzqf
+6-8 z: zzzzzrzw
+1-5 j: jjjnjjjjj
+9-10 g: ggggggxggg
+7-9 r: rrrvrrbrdr
+9-18 j: jjjjjjjjnjjjjjjjjfjj
+14-18 q: kjtxqqqqltlpgqshdx
+8-12 k: kkkkkkwjkkkfkkk
+2-4 s: ssvs
+3-5 z: zzfjk
+9-10 m: rmmlmsmfmbj
+14-15 z: nlzzzzzzzzzdzzzzzz
+8-12 r: zrrrrprrxrrrrkrhk
+1-2 z: qlfzd
+1-6 j: kqjpjzpsgjjqz
+1-5 s: qfssks
+2-5 r: nrrzrr
+4-6 g: kggggg
+6-7 c: cccccdqcc
+2-6 x: vjkxbrfwnj
+16-18 s: kssssssswssssssssssb"
+
+# ╔═╡ 4a629040-347a-11eb-2aae-6f37a4c89168
+input_day2 = parse_day2(input_day2_raw)
+
+# ╔═╡ 5825aa50-347a-11eb-37ca-811e1b59d37a
+md"**Result for part 1**: $(nb_of_valid_passwords_part1(input_day2))"
+
+# ╔═╡ de3c2f00-347b-11eb-0aec-8b776a855f6a
+md"**Result for part 2**: $(nb_of_valid_passwords_part2(input_day2))"
+
# ╔═╡ Cell order:
# ╟─f0dd4400-3313-11eb-3295-af913c2212fb
# ╟─0b7b8920-3314-11eb-2cfb-7d20c0967e67
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projects / advent_of_code_2020.git / commitdiff