From d9f6c01f2b5db021dddc6f7e85fd3851c6c1fdd2 Mon Sep 17 00:00:00 2001
From: Matthieu Bessat <spamfree@matthieubessat.fr>
Date: Fri, 10 Dec 2021 13:42:11 +0100
Subject: [PATCH] day 8,9 & 10

---
 day_10/code.py     |  58 +++++++++++++
 day_10/example.txt |  10 +++
 day_10/input.txt   | 107 +++++++++++++++++++++++
 day_8/code.py      | 205 +++++++++++++++++++++++++++++++++++++++++++++
 day_8/example.txt  |  10 +++
 day_8/example1.txt |   9 ++
 day_8/input.txt    | 201 ++++++++++++++++++++++++++++++++++++++++++++
 day_9/code.js      | 115 +++++++++++++++++++++++++
 day_9/example.txt  |   5 ++
 day_9/input.txt    | 101 ++++++++++++++++++++++
 10 files changed, 821 insertions(+)
 create mode 100644 day_10/code.py
 create mode 100644 day_10/example.txt
 create mode 100644 day_10/input.txt
 create mode 100644 day_8/code.py
 create mode 100644 day_8/example.txt
 create mode 100644 day_8/example1.txt
 create mode 100644 day_8/input.txt
 create mode 100644 day_9/code.js
 create mode 100644 day_9/example.txt
 create mode 100644 day_9/input.txt

diff --git a/day_10/code.py b/day_10/code.py
new file mode 100644
index 0000000..c4e1ba6
--- /dev/null
+++ b/day_10/code.py
@@ -0,0 +1,58 @@
+import fileinput
+
+scores = [
+	3,
+	57,
+	1197,
+	25137
+]
+
+opening_chars = ['(', '[', '{', '<']
+closing_chars = [')', ']', '}', '>']
+
+lines = fileinput.input()
+
+score = []
+completions = []
+completion_points = []
+
+for line in lines:
+	total = 0
+	stack = []
+	line = line.strip()
+	complete = True
+	for column, c in enumerate(line):
+		if c in opening_chars:
+			stack.append(c)
+		if c in closing_chars:
+			i = closing_chars.index(c)
+			if stack[-1] != opening_chars[i]:
+				expected_i = opening_chars.index(stack[-1])
+				# print(line)
+
+				# print(''.join(column*[' ']+['^']))
+				# print(f'Expected {closing_chars[expected_i]} but found {c}')
+				# print('')
+				score.append(scores[i])
+				complete = False
+				break
+			stack.pop()
+	if not complete: continue
+	# the line is just incomplete
+	completion = []
+	while len(stack) > 0:
+		i = opening_chars.index(stack.pop())
+		char = closing_chars[i]
+		total = total*5 + (i+1)
+		completion.append(char)
+	completion_points.append(total)
+	print(''.join(completion))
+completion_points.sort()
+
+print('part 1')
+print(score)
+print(sum(score))
+
+print('part 2')
+print(completion_points)
+print(completion_points[len(completion_points)//2])
\ No newline at end of file
diff --git a/day_10/example.txt b/day_10/example.txt
new file mode 100644
index 0000000..2f182d8
--- /dev/null
+++ b/day_10/example.txt
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
\ No newline at end of file
diff --git a/day_10/input.txt b/day_10/input.txt
new file mode 100644
index 0000000..897ec77
--- /dev/null
+++ b/day_10/input.txt
@@ -0,0 +1,107 @@
+{{[<(<<<([{(({<>()}<[]()>)<({}{})(()<>)>){[([]()]{[]()}][<()()>{()[]}]}}[[(<[][]><{}{}>)]<[{{}()}
+{<{<{[[[{[{<([[]()](()<>))>([<[]()>])}<{[[<>[]]<{}()>](<{}()>([]()))}<[{[][]}[<><>]][<()()>]>>
+<<{[[<([<(<<([(){}])>(<<[]{}>(<>{})>({[]<>}{{}<>}))>)>]{[<[({<<>()>[()())}{([]())[<>[]]})([<(){}>]<<[][]>{{
+{[[[<({{{[{{({<>[]}[()()])[<<>[]>(()<>)]}<{{()()}[()()]}({{}()})>}[{[(<>{}){<><>]]<(()()){{}}>}<{{<>()}[[]
+[<{[{[<[{[[({(()<>)}<{[]{}}<()>])<([[]<>][[]<>])(<<>()>{(){}})>]{{(<()[]>[<>{}]){([]{})}}[{{{}{}}(<>{}
+[<<<{<<[((({{[{}[]]}}[[<()[]>(<>[])]{({}{})(()[])}]){<{{()()}{{}[]}}<{[]()}>>{<[(){}]><<{}{}><
+{[({[[[{<({[((<>[])([]{})){{{}<>}{(){}}}][<[{}{}]<{}()>><{{}()}<<><>]>]})>([[<[<<><>>{{}()}]<[{}
+{(<(<{{(<[(((([]{})<{}[]>))(([[]()]{()<>})(({}{}){<>[]})))]{[([{<>{}}{()<>}]<[{}()]<<><>>>
+{<[[[(<[{(<({[{}()]{(){}}}{{()<>}(()[])})({[{}()]{[]}})>)({{[{()()}[[][]])((<><>)<<><>>)}{
+{<{(<[(<{([<[<[][]>[()[]]]<{<>()}([]())>>]([{<<>{}><{}{}>}[[[]{}]<[]{}>]]{({()[]}){({}())((){})}})){([
+<[(((<{{<[[{<(<><>)<<><>>>{{[]<>}<()>}}<(<[]()>{()<>}]{([]<>)[[]{}]}>]](<{{({}<>)[[]()]}[([])]}<[<{
+({[[(<{[({<{<[{}()]([]{})>(({}{})(()<>))}<(<{}[]>({}()))[({}<>)]>>}[[([[(){}]([]<>)][(<><>)({}{}}])<{[{}()]}[
+[{{[(({[{{({(<()[]>{[]<>})}{[({}())]{<()[]>[{}{}]}})<(([()<>]{()()}){([]{})<[]>}){<<()<>>[<><>]>{<<>{}
+{{<{[(<(({<{{<(){}>(()<>)}}[<<{}()>{{}{}}>([<>()]{<><>}]]>}(({{<{}()>([]())}{({}())}})<<{{
+{{<<<[{{<[(({[<>{}][[]()]})({[<>()]<<>[]>}(<{}{}>([]<>))))[[((()())[{}{}])[<[]()>[()<>]]]{[({}{})
+(({[({{<([<[{{(){}}<{}[]>}]([({}<>){<>[]}]{({}{})(()())})><{<[{}{}]{[][]}>{[{}{}]{[][]}}}{<[()]<{}{}>>
+[{[({<({<<({((<>()))})<{<[[]<>](<><>)>}[{<<>[]>{<>()}}([{}{}]{{}[]})]>>>})>})<[[<[{{(<({<><>}{<><>})<<(){}>>>
+{(<<{(<{<[[{<<()[]>{()<>}>}{(<<>()>({}()))}]]>([<[<<{}>[<>{}]>({[]<>}(()[]))]<{{<>()}<{}{}>}
+{{(<([[<[({<{{{}{}}(<><>)}<({}<>)<{}[]>>>}[[({()<>}{{}[]}){<{}[]>{{}[]}}]<[{{}()}([]())][({}{})[{
+(<(<<{<[{{((<{{}()}[()]>({{}()}[[][]]))({{()[]}[<>{}]}{<()[]><()<>>}))[{[{[]()}[{}()]]([{}<>])}{<<()[
+[{(<<{[([[({<[{}{}){<>{}}><[()<>]([]{})>}{<[()[]][<><>]>[{[]<>}[<>{}]]})]]{<<[<({}[])>(<<>{}>[[][]])]><([{{}{
+[{([([[<{[[[<{<>[]}{()()}>((()<>))][{[{}()][[]{}]}]][{{(()<>)([][])}{({}{})(<>())}}(([{}{}]){<
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+{<{[(<{(<((({<<><>><<><>>})[[{()()}[()()]](<{}()>((){}))]))[{<[({}{})[{}[]]]([[]()])>((({}<>)[[]
+[{{(<[[[{{[((<[]()>[[]<>>)[<()[]>])]({<[[]{}][{}{}]>{[[]]{<>{}}}}(<{[]{}}<<>{}>><([]<>){[]{}}>))}{[<{{[]()
+{<<<(({{{{(<{{{}[]}}><[{(){}}<[]()>><<()()>({}())>>)<(({<>{}}([][]))<<()[]><{}()>>){[{<><>}[[][]]
+{<[({({<<[{{{{[]{}}(()[])}<{(){}}>}<(([][]){[]{}})>}]{[{{<<><>>[[]<>]}}<[([]<>)<{}()>]{{{}{}}
+{({<<[(([{(<((()[]))<[{}]>>[<({}[])[{}<>]>[{()()}<[]()>]])<((<(){}>(<>[]))<<<>><{}()>>)[<({}{}){
+<<[<(((<{{{<<{<>{}}<{}()>][([]())[{}()]]>[[{()<>}<{}[]>]<(()()){<>{}}>]}}<{([{<>()}<<><>>]{{()()}}
+[(<<<[(([{[<(<()()>)[{<><>}{(){}}]>{{([]())[<>{}]}{{<>[]>[{}()]}}]}]))]>[[[{<((<(<()<>>){{<>[]}<[]
+[{(<[((({{([(([]{})<{}()>)<[[]{}]{{}()}>]<{{<>[]}{[]()}}({<>()}[{}{}])>)[{{<[][]><<>[]>}[<{}{}>]}<<[[][]][(
+([<(<<[(({[[<<[]{}]>{[()[]](()<>)}][({{}[]}{{}{}}){{{}<>}}]]<{({<>}(()[]))[<()[]>{[]{}}]}[{<
+<<[<{{(([([<[[[]{}]<[]<>>][[<><>]{()()}]>]((({{}{}}(<>{})){([][])[{}()]})))<<([(<>)<[]{}>][{{}()}
+(<{<([<[{[([(<[]{}>{{}})(([][]){[]{}})]<<({})[()()]>(({}[])[{}<>])>)(<[{{}{}}{{}[]}](<[]{}>[()[]])><<{{}()}
+[{({{(({[{[<<[[]()]<<><>>>({()()})><[{<>()}{()<>}]<<()()><{}<>>>>]{(({<>{}}([][]})({{}[]}<<>()>))<<(<
+{(<(<{{(((<({((){})[()[]]}{<{}()>{{}()}})[(<{}[]>[{}{}])([()[]]<<>()>)]>{[<[[]<>]<[]>><{{}<>}
+{[[<{(<<<[{(((<>[])<{}<>>)<{[]{}}{<>{}}>)}[[{[{}{}][{}<>]}[(<>[])({}())]](<[{}{}]{()<>}>)]]([(((<>{})({}
+{(<(({[([([((({}[])[()]))]([((<>())[[][]])])){{({([]())([][])}(<()()>{()[]}))}}]<{<(([{}[]](<>{}))[<[]
+({<[[<<(<[(<[((){})]{[(){}][(){}]}><(({}())[<>()>){{()()}}>)(<[<()[]>(<>{})](<[]{}><(){}>)>[({[]
+[<<[{{[<[<[[{[(){}]{<>[]}}[(<><>){{}{}}]]{<((){})(()[])>[[[]{}]{{}}]}]{(<{<><>}<{}<>>>)([(()[]){(){}}][
+(<<<((<[<[[[[{{}()}{[]<>}]<{(){}}[[]<>}>][<[[]{}]{{}<>}>{<<><>>([]{})}]]]{{{<{<><>}[{}()]>}
+{{<<{[{[<[{(({{}()})(((){})[<>{}]))[[<[]{}>[[]]]{[[]{}]{{}{}}}]})>[{([{(<>[])[<>]}]<<[[]{}][<><>]>{{{}()}({
+[{{{(<{{[<{((<<>{}>[(){}])[(<>[])<[]<>>]][(({}<>)<[][]>)({[][]}{<>{}})]}({{[<>[]]([]<>)}}{(
+<[([{[<<<[([(<(){}>{<>[]}){[{}[]]{[]{}}}]{({<><>})[[<>{}][[]{}]]}){<[<<>[]>[<><>]]({[]{}}{<>[]})>[
+[(<(<[({<[{{({()<>})<[()<>}<(){}>>}(({[]<>}(()<>))([()()]{<>}))}<{{([]<>)<<>>}[[{}<>]<[]()>]}<<([
+[[[<([[[[<<<((()<>)<[]<>>)(<{}()>[<>()]))>{((({}()))(<<>()>)){{{<><>}}<<{}<>>>}}><{{({[][]}<{}{}>)[(<><>
+<<[({(<<<[{([(<>{})[{}[]]](({}[])))[<(<>[])><<()[]>[{}{}]>]}{([<[][]>{()()}][<[][]><[]<>>])}]>>>)}[{((<<([{((
+{(({[{{<[(<<<<<>()><{}{}>><<{}<>>[{}<>]>>((<()<>>)(<[]{}>[[]{}]))>((((<>())[[][]]){{()()}([][])}){<[<
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+(<<[{[(({[({{{()()}(()<>)}<<<>()><<>[]>>})<{([<><>]<[]()>){<{}()>{(){}}}}>>}[{(<{[{}<>][<>{}]}([()()]({}()
+({<<<<([{(([(<<>>{[]<>})][<<[]()>({}{})>])({(<{}[]>){([]<>)([]{})}}<[{[]{}}{<>{}}]>)){<{<[[]<>]([]<>)>
+([{[[<((((<[[{<><>}(<>())]<(()<>){[][]}>]<[([])[<><>]](<{}{}}([]()))>>){{{[{<>{}}([]<>)]{[(){}
+[{([[(({<[[{{(()[])(<>{})}<[()<>]{{}[]}>}{[<<>>[[]<>]]<[[]<>][<>()]>}]]{{[{<[]{}>((){})}<<<><>>{{}()}>]
+(<({(<<({([<[{(){}}[[]()]]>[[[[]{}](<>())]]]{{({(){}}(<>{}))[[<>()]<<>{}>]}({[<>()]}{{[]<>}{[][]}})}]}){({{<[
+{([(((<{<[<{<((){})[<><>]>({[]()}<<>{}>)}}((<(<>())>{<{}()>{{}[]}}))]<{(({[]<>}<[]()>))<{{()}[()[]]
+([[((([<[[{<[(()())][(<>[])]>[[[[]<>]{(){}}][[(){}]{<>[]}]]}({[<{}<>>(()())]<({}<>){[]<>}>}[(<{
+{([<{{{[{<[<<[<>()][<>[]]><<(){}>>>]<<({{}[]})<(()[])>>[<<[]<>>[()[]]><([][])[<>[]]>]>><[[[(<><>
+<<{[<[{[[{{<[(<><>)[<>()]](<<>[]>{<>()})>{<{<>[])(<><>)><([]<>){<>()}>}}({([{}{}](<>()))<{(){}}([]
+({<([({{{<{(({[]()}{<>[]})<{{}<>}[<><>]>)(<[[]]<()()>>]}>}}}){[{{<{<[[()[]]<()<>>]{{{}[]}{[]<>}}>}[{{{
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+{{[[((([{{[<{<{}()>}[(<>{})<{}()>]>({((){})([]<>)}([[]<>]{{}()}))]{[{{[]()}(())}(<<><>><<><>>
+<{({[((<[<{[({<>[]}{{}{}})(({}<>)<()[]>)]({{{}()}[<>[]]}[<[]{}>[{}()]])}([{[<>()]({}[])}(<[][]>
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+[[<[{[(({<<((<<>{}>[{}[]])){([<>{}]){{(){}}<(){}>>}>({<[{}<>][{}{}]><(<>{})>}[<({}{})[[]{}]>[[()()][{}]]])>}
+({{<[<<[([{<<{[]()}{{}<>}>(<(){}>(<>{}))>}]<{[{{<><>}<<>[]>}(<()()><[][]})]{<[{}<>]<<>[]>>}}({{{()}(
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+{[[[((([<[([(([]())({}{}))<<()<>>[(){}]>](<[<><>]{<><>}>{{{}[]}{<>()})))](({(<<>[]>)}){<<<
+{<(<[<{{<<{[(<()[]>{{}<>})(<()()><[]{}>)]([{()()}<<>()>](<()[]>)}}([(<[][]>)[{{}<>}<()[]>]])>{<({<[]()>{
+[[[<[({([[{({(<>[])<{}>})<<<[]{}>>{[[]{}]{[][]>}>}[{<[<>[]](()[])><[{}<>][[]()]>}]]((<{{[][]}{(){}}}(([][])
+(<{<[<{({<[[[{()<>}[[][]]](([]{})[{}<>])][[<[]{}>{(){}}][<<>{}>[{}()]]]]<[{{()}(<>[])}((()<>)[{}[]])]
+{[{({(<{(<(<{[<>()][()[]]}[({}{})<<><>>]><<(<>[])([]{})>])>)}(<<<([[{}{}]({})])({[[][]]<[]{}>}{[<>[]
+[[[(<[{([[(([({}{})(()[])][<<>()>{[]()}])<<{<>{}}([]{})><(<>[]}<()[]>>>)({[<[]>((){})]<[{}<>][[]<>]>}{<<[][]
+(<[<[(<<[<<<({{}[]}({}[])){(()<>){{}{}}}>>>[{[[<{}()><{}()>]{(<><>)<{}{}>}]([{[]<>}{<>[]}])}({{([]()){<>{}}}
+[([[<<[(<[[{[((){})({}())][({}{})[()[]]]}({{()[]}}{[[]<>](<>())})]{(<[{}<>]{()()}>({<><>}((){})))}]((
+{<[{([{<<(<{{{[]{}}}[([]<>)(()<>)]}<<<<>>[()<>]>{([][])(<>())}>>)<({{[()[]]{<>{})}<<[]{}>(()<>)>}
+[[<[{[<{{<<(<[{}<>]{<>{}}><{<>[]}[[]<>]>)>[{[({}[]){(){}}]({<>()}[<>{}])}]>{([([{}{}][<>[]])[[{}{}]]]<{[()
+{<({<{([<(<(<[(){}][()[]]><{<>()}<<>{}>>)<[{[][]}]{([][])<(){}>}>>[({(<>{})<<>{}>}{{{}<>}{[]<>}}){<
+(<<(([{<[(<{({[]()}[[]{}])}([<())(<>{})]<(<>{}){<>[]}>)><{[<()<>>]{<()()>{{}<>}}}{{({}<>){
+[[<[[[<({<[{[{(){}}<()()>]}([{{}{}}{()()}][([]())<<>>])])[({<<<>()><[]()>>{([]()){[]}}}){{{[{}{}]<{}>
+<[(<[(<{(<{[(([]()))]<{[[][]]}{[<>[]]}>}<{<([]<>)>}{[((){})<[]()>][({}{}){{}{}}]}>>{({{<{}()>[[]{}]}[((
+({(<[[([<{[([[<><>]((){})]{[[]{}]{()}})<[<[][]><{}<>>]((()[]))>]}(((((()())[[]()])({<>()}))<{[
+<<({[<<[<{{[([{}[]]({}))[{{}()}{{}()}]]{[<{}{}>]<{[]}{()[]}>}}}><[{<((<>()))<{{}{}}>>(<(<>{
+[(((<{[{<{<<{[[][]]{[][]}}>>{<{[[]{}][<>[]]}{([]{})({}{})}>{({{}()}<()<>>){({})[{}[])}}}}>[(<{{{(){}}}<({}[]
+{<<(<{({[{<{<([]())[{}()]>[[()()]<()>)}<({[]()}<[]<>>)<{<>()}(())>>>}(([[{<>()}<<>()>]]{({()<>}
+[[({<<[([{([[[<><>]([][])]<([]{})[<>[]]>][<[[]<>]((){})>])<(({()()}{{}{}}))({{()[]}([][]))[[<><>]<[]{}>])>
+(<{<{[(([{[{<([][])<<>()]>{({}[])<<>>}}{<{[]<>}<[]{}>>}]{(<[{}[]]({}())><{(){}}{{}<>}>)}}][[{
+<{[[<[{(((([{[<>()][<>[]]}]<<{()<>}>(({}<>))>)[[({[]()}<[][]>){({}<>){[][]}}]((<{}{}>{()()}))])[<
+<<<<[<[[[(<[{(()<>){()()}}([{}{}]<[]{}>)]>[{<<<>{}>{()[]}>({()}[()[]])}((({}())([][])))])]<([([<[]
+{((<({({{{<<[{<>{}}(()[])]{(<>{})([]{})}>>{{{({})[<>{}]}{<{}>}}{{<[][]>[(){}]}{{{}[]}<<>()>}}
+<[{[(((({{{[<<(){}>(<><>)>{{{}[]}<[]()>)]<<([][])([][])>[[<>()][[]<>]]>}((([{}])<<{}[]><()<>
+[{[{<{[{<(([<(<>[])(()<>)>([[]<>]([]()))]<({{}<>}<[][]>){<<>{}>{[]()}}>))>[([(<{[]()}{{}[]}><(()<>){[]
+[{[[[(([[[(([<{}[]>][[<><>]{()<>}]){[<[][]>]({<><>}[[][]])})({{{{}<>}{(){}}}<<()>[{}()]>])]]{(<<((
+(((([[{{<{[{<(()())(()[])>(({}<>){{}[]})}[<({}[])[[]()]><{{}()){<>()}>]]{[{<()<>><()()>}]{{<(
+{[<[(({({<[(<{<>[]}>[{{}[]}{()[]}])[<[()[]]([]())>{[[]()]{{}()}}]]{<{<<>[]>(<><>)}>{([[]<>]{()<>})<{<>}>}}>}(
+[({[{((([({(([[]<>]([]{}))<({}{})>)})(({<([]<>)([][])>}({<[]{}>[<>{}]}[<<><>>([]())])))][<<<({(){}}([]()))
+[{<(<<{<({<{[({}<>)<{}{}>]{<[]{}>{<>[]}}}{{{{}()}(<><>)}({<>{}})}>{{<{{}()}<<>{}>>({{}}(()[]))}(({<>{}}[
+{(({<<{[((<((<{}()><()<>>)[<()()><{}[]>])[[<[]()>(()<>)][<{}()>{()[]}]]><<{(<>{})[[]{}]}[<[]<>><{}{}>]><{<{}
+{{[{(<{({(<(<([]{})([][])>[{<>}<{}()>])(({()[]}[()<>>){(()<>)<{}[]>})>[(<([]<>)([]())>(<{}<>>[()[
+<[(<<[{[{[[<([{}<>]<[]<>>){[{}[]][{}[]]}>{<([]{})}<{{}{}}<<>()>>}]]}[([([{[]{}}<(){}>]{[{}{}][{}{}]})<<({}{}
+{[<<[{{<<[{{[[[]<>]{<>[]}]<{{}{}}(()())>}<((<>[])<<><>>)>}<{[<[]><{}<>>]<[{}<>}{()[]}>}<([(
+[<([({<<[{{{(<{}<>>({}())){[<><>][<>[]]}}<{<[]<>>{[]()})[([]{})<<>[]>]>}{{{[[][]]<{}[]>}[<[]<>>(()<>)
+[((([[{<{[{{((<>[])(()<>)){{[][]}{{}{}}}}({({}<>)({}())}((<>{})[{}{}]))}]<(<((<>[])<(){}>)>
+<({{({[{{<{([{()[]}(<><>)](((){})(()[])))({[<>{}]<<>[]>}[<<>[]>])}>}<[{<(<{}<>>)<{<><>}<[]>>>(([{}()]
+[{{<({((<([(<[<>{}](()[])><{[]()}<<>()>>)[<(<>)(<>())>)]({({()()}[()[]])}<[[[]<>]<{}<>>](({}[]){
+
diff --git a/day_8/code.py b/day_8/code.py
new file mode 100644
index 0000000..1fda726
--- /dev/null
+++ b/day_8/code.py
@@ -0,0 +1,205 @@
+import fileinput
+import itertools
+
+# key: the digit, value: the number of segments
+digit_segment_count = {
+	0: 6,
+	1: 2, #
+	2: 5,
+	3: 5,
+	4: 4, #
+	5: 5,
+	6: 6,
+	7: 3, #
+	8: 7, #
+	9: 6
+}
+
+unique_digit = { # easy digits: 1,4,7,8
+	2: 1,
+	4: 4,
+	3: 7,
+	7: 8
+}
+
+actual_digit = 'abcdefg'
+
+actual_digit_mapping = {
+	0: 'abcefg',
+	1: 'cf',
+	2: 'acdeg',
+	3: 'acdfg',
+	4: 'bcdf',
+	5: 'abdfg',
+	6: 'abdefg',
+	7: 'acf',
+	8: 'abcdefg',
+	9: 'abcdfg'
+}
+
+# ab: digit 1
+# dab: digit 7
+# eafb: digit 4
+# acedgfb: digit 8
+
+def get_keys(d, value):
+	keys = []
+	ls = filter(lambda i: i[1] == value, list(d.items()))
+	ls = map(lambda i: i[0], ls)
+	return list(ls)
+
+data = []
+ex =[]
+#ex = ['acedgfb cdfbe gcdfa fbcad dab cefabd cdfgeb eafb cagedb ab | cdfeb fcadb cdfeb cdbaf']
+for line in ex+list(fileinput.input()):
+	content = line.strip()
+	if content == '': continue
+
+	def parse(x):
+		l = map(str, x.split(' '))
+		l = filter(lambda x: x != '', l)
+		return list(l)
+
+	ls = list(map(parse, content.split('|')))
+	data.append((ls[0], ls[1]))
+
+def part_1():
+	count = 0
+	for _,output in data:
+		for x in output:
+			out = get_keys(digit_segment_count, len(x))
+			if len(out) == 1:
+				count += 1
+	return count
+
+def is_similar(a, b):
+	return set(list(a)) == set(list(b))
+
+#print(part_1())
+
+def find_by_length(ls, length):
+	return list(filter(lambda x: len(x) == length, ls))[0]
+
+def diff_str(a, b):
+	commons = []
+	longest,shortest = a, b
+	if len(b) > len(a): longest, shortest = b, a
+	for e in longest:
+		if e in shortest:
+			commons.append(e)
+	all_d = list(set(a+b))
+	diff = []
+	for e in all_d:
+		if e not in commons:
+			diff.append(e)
+	return diff
+
+def remove_char_from_str(subject, char):
+	return ''.join(list(filter(lambda x: x != char, subject)))
+
+def remove_set(subject, char_set):
+	return ''.join(list(filter(lambda x: not (x in char_set), subject)))
+
+def remove_char_to_entry(entry, char):
+	new_entry = []
+	for e in entry:
+		new_entry.append(e.replace(char, ''))
+	return new_entry
+
+# return true  
+def included_in_str(subject, char_set):
+	pass
+
+
+def process_entry(entry):
+	str_3 = find_by_length(entry, 3)
+	str_2 = find_by_length(entry, 2)
+	a = diff_str(str_3, str_2)[0]
+	cf = str_2
+	# on récupère le bd à partir du 4
+	str_4 = find_by_length(entry, 4)
+	bd = remove_set(str_4, cf)
+	
+	# enlever a
+	entry = remove_char_to_entry(entry, a)
+
+	# trouver g
+	# trouver le str_5 qui continent cf et bd
+	str_5 = list(
+		filter(
+			lambda x: included_in_str(x, cf+bd),
+			find_by_length(entry, 5)
+		))
+	print(str_5)
+
+	return entry
+
+def digit_with_mapping(mapping, digit):
+	assert(digit in actual_digit_mapping)
+	actual = actual_digit_mapping[digit]
+
+	encoded = [mapping[actual_digit.index(a)] for i,a in enumerate(actual)]
+	return ''.join(encoded)
+
+
+def process_entry_force(entry):
+	sets = [set(s) for s in entry]
+	poss = list(itertools.permutations('abcdefg'))
+	for p in poss:
+		# we do an hypothesis that poss is the mapping
+		mapping = ''.join(p)
+		ok = True
+		for d in range(10):
+			s = set(digit_with_mapping(mapping, d))
+			if not (s in sets):
+				ok = False
+				break
+		if ok:
+			return mapping
+
+def compute_output(mapping, segments):
+	def match(w):
+		i = mapping.index(w)
+		return actual_digit[i]
+	a = list(map(match, segments))
+	a = list(sorted(a))
+	key = ''.join(a)
+	d = get_keys(actual_digit_mapping, key)[0]
+	return d
+
+
+def part_2():
+	res = 0
+	for entry in data:
+		mapping = process_entry_force(entry[0])
+		val = int(
+			''.join([str(compute_output(mapping, d)) for d in entry[1]])
+		)
+		print(f'{mapping=} {val=}')
+		res += val
+	print(res)
+
+
+print(part_2())
+
+"""
+{dab} = {acf}
+{ab} = {cf}
+
+so d = a
+
+
+using the "unique signal patterns" hypothesis will give:
+
+0,1,2,3,4,5,6,7,8,9
+
+on enlève les digits faciles (1,4,7,8) 
+
+1 = cf
+4 = bcdf
+7 = acf
+8 = abcdefg
+
+il reste donc 0,2,3,5,6,9
+
+"""
\ No newline at end of file
diff --git a/day_8/example.txt b/day_8/example.txt
new file mode 100644
index 0000000..c9f629b
--- /dev/null
+++ b/day_8/example.txt
@@ -0,0 +1,10 @@
+be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb | fdgacbe cefdb cefbgd gcbe
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce
diff --git a/day_8/example1.txt b/day_8/example1.txt
new file mode 100644
index 0000000..a758270
--- /dev/null
+++ b/day_8/example1.txt
@@ -0,0 +1,9 @@
+edbfga begcd cbg gc gcadebf fbgde acbgfd abcde gfcbed gfec | fcgedb cgb dgebacf gc
+fgaebd cg bdaec gdafb agbcfd gdcbef bgcad gfac gcb cdgabef | cg cg fdcagb cbg
+fbegcd cbd adcefb dageb afcb bc aefdc ecdab fgdeca fcdbega | efabcd cedba gadfec cb
+aecbfdg fbg gf bafeg dbefa fcge gcbea fcaegb dgceab fcbdga | gecf egdcabf bgf bfgea
+fgeab ca afcebg bdacfeg cfaedg gcfdb baec bfadeg bafgc acf | gebdcfa ecba ca fadegcb
+dbcfg fgd bdegcaf fgec aegbdf ecdfab fbedc dacgb gdcebf gf | cefg dcbef fcge gbcadfe
+bdfegc cbegaf gecbf dfcage bdacg ed bedf ced adcbefg gebcd | ed bcgafe cdgba cbgef
+egadfb cdbfeg cegd fecab cgb gbdefca cg fgcdab egfdb bfceg | gbdfcae bgc cg cgb
+gcafb gcf dcaebfg ecagb gf abcdeg gaef cafbge fdbac fegbdc | fgae cfgab fg bagce
diff --git a/day_8/input.txt b/day_8/input.txt
new file mode 100644
index 0000000..79bf091
--- /dev/null
+++ b/day_8/input.txt
@@ -0,0 +1,201 @@
+eb cbgfae cabdf fedab efb adgcef cbgaefd egdb dbgefa eafgd | dfbae be gdafe gcefab
+bfcae acegfd dbfac daf bgfdc dfgaceb gfebdc da dbag cdgbaf | bgfdc dfcba bdegfc efadcg
+afgdb dcge ed dfe geafcd aefdcb adgef gfcea gdbecfa agfceb | dfe ceabdf efbcag gefacd
+ebad gbfed dfe caefdbg gdbcf fgcdae de fdgabe efbag gabecf | gacfed bgedf dfebgac befga
+dabegfc gfeab gdefbc ecagdb bcfd fd ecdgb adgfec bfdge dgf | efbag egbdf ceagfd dfegb
+bfadge dbgec fgbdce cafbgde gbe gcbafd cfbe be cgbdf aedcg | bcdeg egacd beg cgedb
+aecfgd dabcegf gca dbgacf gc degbaf caged gefc adebc agfed | agc gc cg fdgaebc
+beagfc ecf agdecbf cf acfd dgace deafgc efbgd gdfce gadbce | decfbga dbaceg bfgde gdecfa
+cgbef dafeg fdc gbadfc cbed aedbcgf cd bfagce fcgde efgcdb | gefcd fgacbd cd bfegdc
+bce efdcbg ebgfda cbfgae bdegc ce dfec dbefg cgadb edcfgab | cfaebgd bedgc cfed efcd
+gedcfba cfbdg dgecf bafdcg efbgda cbed efd bcfged de afegc | bfcdg agefc fabdgec fegca
+fa dgcef gfacd bdgac fcbegd fedcga adef fcgaebd afbgec acf | gefdac egfcbda egfdc gefdca
+ebcgf dagbc cfedga cfgba afg agebfc befa dcfgaeb af edbgcf | cbgefd acdgb afdgce fabe
+gfe fg fdageb bgfd cagfde abegf baecf daegb cabged cgfdeba | gfe gdafbce fg bgdf
+bagdce acfbd faebcgd dae fecdbg ageb ae dbcae defacg gedcb | dea eabg bcdae aecdb
+gceaf dagc eda febcagd gebdaf ecafdg deacf ad cdebf abgcef | fdaec fdebc dcfae ade
+adebcfg ecd ecbag bgaecf cgdfb afecdb gbedc caedbg aegd ed | bedcag gabecf dcgfb fcabed
+fbecda cabgf dg deag cdeagf gdf begcdfa acfed cfagd dcegfb | dg edcfa gefdbc gdea
+gfbcad dafbge fdcbea dgbfa dbeag eb eba eadcg bgef edgfcab | agbed degafb eagdb caedg
+aegbdc fecdgb eac cgefab fecag abcf ca dbgeafc gebcf fedga | fbgecad abfc cgefba agcef
+dc fcda gadbec fabcgde gbcfda dcg befcg deabfg bgdcf fgdba | cdfa acfdebg fgadbe ecfbg
+cdbagf gcf badgc fgdac fc cbgead fbcd defga ecagbf gdbafce | gfabdc bdcf gcdab fdcb
+cfdabe faedc febcg acbd abf cdagfe ebdgcaf bdgfea ba beafc | fab bafdce dacbfe fab
+eag cfedba aecgdfb deafgb agcdb gefc eg gdeafc ecadg cedfa | fedabc gbadc bacdg gecad
+fgcae afbdec cad edfab cedfa cdfb bdceag bfdeag fdgecba dc | ecagf dc fdecab cdaef
+fcegbd dagefb dbf cgfbd eafcdg dbagc cfdeg gecbafd fb efcb | bf efcgd gdcef gbfedc
+dgbcfe dagef fcbadg fdceg efbc edgbfca deabgc ec cbdfg gec | feagd dbafgec fdgcb bdgaecf
+fgbcd dagcef fb begfac cbdge bcf gacfd gafbdc gbfadce adfb | bfc bcdgf deagcf fgdbc
+gafdbe gefba bf gbdaec faecg bcgfead bgdf efb acfbde gdeba | becagd bf bdfg fb
+af agdcfbe aegfbc agdf dfbce acdbf fab edabgc cdabg gdbafc | dagf fa bdfce bfgdca
+edfgba edbgf afb beadc gbcdfae dfga afgceb af edbaf gefbcd | efgcba ebagdf dbgfe fa
+fecba df dbf dcefgba dgaf aefbd decbgf bcdeag begad deafbg | acbedg degabc fdebcg deabg
+cgabedf abd daebgf gbde db bdaefc fecgad cagfb gabdf edfga | gabfc cgbaf beagcdf cafdge
+efdgb fbe adcbfe edfbga cafgbde gefdca be eagb gbfdc geafd | eb eabg bega abfgde
+cfadg bfeacg gae ecdfga dgcea fabdcg efgbacd aecbd ge fedg | adcgef fdgaec gdface gcfadb
+gabd fcdbag cagfbe deafgc dcbaf ad bdefc dca dcbefag bcagf | facdb gceadf dagb bcafg
+adc eabfcd ecbgad dfab bedfc edcfa ecafg fecbdg fdaebgc ad | cadebf egcaf gaecf febdc
+gfdab cd agcbef cedf ecabdf ebacf febdgca dbcgea fbdca dcb | fabdc fcbdae acebf dc
+bagcd gdabfc dcg fgecdb dc dfcbaeg cbage dfgba dcfa dfbega | dc egbfcad gfdba dgc
+deb beacd cdbga gbdfce cegfbda abgced be dacfbg agbe cfeda | gfbcad deb ebd cgadeb
+efbag gbe gbaefc adbefcg gb bacg efbacd edafg bgdfec abcfe | bacg gfead dfeag dbfgce
+gdbfea dacgfb dacbfge fgceb cd afedb efcdba bcfed cdb ecad | gdfacb bdgfea ecgbf ecda
+caedbf dcge abgdc gcfbae fcdbgae bcg abcedg bgdfa cg decba | acdgbe cg gbc ecfdabg
+adfce bdefga acdgfeb fadeg gecdba gebf bfcagd afg ebdga fg | bdage fg edafbg fgadbe
+gfbdec cabdf dca fgca gbcdf ca fbaed cagbdf fagbced eadgcb | ac badecg afbde bcdfeg
+gdc agbed adbgc abgfc eabgfcd acfd dc gecfdb cfeagb gcafbd | fdac beadg gcafbd cdabg
+cf ecgfadb ecabdg begcaf bfadc fabdgc dbacg cgdf bfade cfb | dafbc cadgb becfdag cbf
+fda abgfe gcadbf cdae egfcad bfedcg gcfed ad dfega fgdeacb | cgdef efcbgda fbgdeca eacd
+ef ebfcad dceag acgbdf fec bagfedc fbeg ecgdf ebdfcg bfgcd | efcgd bgef fdcgb gfcbd
+gadbecf bdgcea fb bafedg bfcdag bdfc aefgc dabgc facgb baf | abf adfebg fba bdagc
+afgceb dfcba cdeb gafdecb bcf edfcba bc aedfc fdbga fcaedg | fbedgca efcgda ebacfg deabcf
+gefbcad cgfbd cagdf dfa fa gdaefb fabc cefdgb aedgc gbcdfa | deafbg caegd ebfadcg dfa
+bfced gdabfc dbeac afgdce fegb dfgcaeb egdbcf fce fe dbfcg | bfdce cdegfa acdegf befdc
+edb befcda fabcd ed adbce cfbaegd fbcgad cedf gcaeb agebdf | fegdab bed fgaecdb afdecb
+fbea gebdac gbdea fbeagd gdfab fa dfa adfcegb aecfdg bgcdf | faebdg cfbdgea dbcgf adbgf
+eac cgabef aebgf cgbde dfebcag efadbc aegbc daefbg facg ca | fcag eabfcg cae cgbde
+ce fce gdefb geca dcfeg afdcg gfcdea ecabgdf gbfdac cedafb | gcefd fcdage gdacf gefcd
+fbdcgea fabcg ebafg gfecab fge gebc bdfcag debaf eg fgdeca | acgfb bacfg cgbfa gfbea
+acdeb gcedba befac bacdgef gfbec fbdeca afc fdceag fa dabf | baegdc gecfb dgfeca bafcdge
+dfgbc deagfcb cfga dabgc fagbed cfbgda bfedcg ag abg adceb | gdfceba cgdab dbcea ga
+ecafbg ge feg cadef decfabg begd geafd dfgacb gfdaeb gbafd | dacef ge gef faedg
+gabecd ecdag edabc fdcbgae ebdafc bcdg gbadef dg cfage edg | cgbade cbgd cgdb edfbgca
+beca bgead fbecgd fbagcde cb gbc egfdab dgfac dgbac eabcgd | gaebd dcafg dbgefca abec
+bcfea ead cebda fbdcge dgabce gedbc fcdage da dcafebg badg | cbged aegfcd dbag agdb
+cefagd gfbedc fagc acedb efc aefbdg afcde fc gafed febgdac | feabdg ceafgd eacfdg feagdc
+dbegfa aefdcbg bafecd cd cfaged bfade febdc adcb dcf cfbge | cd badfe dbca bdgfae
+dcfa eaf aedgfc aecgbfd efcag fa edabfg fegdbc cgedf agbec | ceagb cfbdeg gabedf fa
+db eadgbf dagfc gbefdc egbcaf bdegafc debc fbd bcdgf fegcb | gfcedb ebdc eagbfd ecbd
+cb cgbafde dcfegb cdfgae facb bcg degab gefacb caefg cgbea | degba bfgedc egacb egcfa
+gbcfd dabgfe abecfgd beagcf cg gcad bgadf fdecb bafdgc gbc | abegdf dagfeb cdebf gcbdf
+bfaedc deabgf aecbf fgcba ec bdefacg aedc fcbgde dbafe bce | gfcdbea fbdae bdcaef ec
+bedafgc dgcbfa ebc afgcb cfade geba debfcg cgfbea ceabf eb | faedc ebga bega baeg
+dfeag acegd cae bgdca gdefab ec cefd cadgefb eadfcg fabcge | faecgb gedaf eca aec
+abgf cgebdfa dfcab adcfg cdbgaf bdcefg efcdga dfb bf abecd | gfeadc baecd gcdeaf bfegdc
+cbgde egfadc dafec abdf cba ba afgecb bdeac aedbcf adecfbg | eadfc debcg abc ba
+ecdfgb adecgf fcged cbef bdceagf bde adgbc cbgde gbfead eb | agdcef dfabge eb cedfag
+dgb bg dgfaec efadg bedag afbg bagfdce bfcegd edabc agebfd | befdga dgbea dceab ebadg
+cfbe agedb bcg acefg acegfdb bgafec aecbg gafced abgfcd cb | cgbadf adfgcb gfacbed cdeagf
+gadfc bag acgdbf abfgce bfgda fedcag dfcegab gb fdeba gdbc | bcfgae febad bg bag
+cbaef fgea gabfdc fac cegdba ecabg fdebc ceagfdb af gaefbc | gfcbad dbcage cbaef fca
+bace bdcfe bfgedc afb cabdfe ab aegdf befad agecbfd dfcgab | ab cebgfd bace fdgbeac
+agfb bgcad edgca becfda cabfgd gefdcb ba cabdgef bcdfg bad | cdabg daceg bda bgfdc
+cbefad gcfbade bdcgf edcaf gad acfegd dfeagb ga gcea cdagf | gda ag agd ga
+agc adgec ca cgdfe bfdcaeg cdfbge cedfga edagb acbgef facd | abgde bdfcaeg gdabe gca
+egcda degcb fabcgde fgaebd be gfdeac ecab bde gfcdb edgbac | dbe afgbde ecab deb
+defbga bceg cabgef cadgbef agefb dfgcba becaf dceaf bc cba | gaebf cafeb bc dfacgb
+bedag bdfcea dfbacg efdg ebcga abedfcg dg aefbd gbdfae bdg | caebg degbcaf gbcfda efadb
+eb bacdf bde bega gdfaec daecg dafcbge acdbge cdabe ecdfgb | agecd eb edb bde
+gabcd dcafbe edacgb badce gdcefba fgabc dcbgfe dg dage dgb | dg ceafgdb dfgbec ceadbg
+acedb geadcb cafd edf fdcegb dbfae dfcabe fd agfdbce agbfe | adfbe dcbaef dcaf eagfb
+dgfb daebcf gaced dab ecgbfad eabfgc db gabedf fgeba agbed | bd bd acedfb fcdbega
+daebf befdac gf bdecfag egfb gabefd adfgbc fgeda fgd cdage | agedc fg fdbeac defcab
+bcgda egbdac bgf dgbface cagbdf afcb fb ecfdgb edgfa gadbf | fbcegd egcbfd adgfcb dgbaec
+de ebcfa dec bacegdf afdbec ecgbaf fcaed cafgd bfde cedabg | cdeagb cfgabde fbed bgedfca
+cdgbf cgedbf cdef baceg ef dfbacg bef egbcf dfeagb bafgcde | gbfce fbdcag fcabgd ef
+fbac efbdga gebdc fc bfegc bgcfead dfcega baecfg afgeb cgf | adcgbef abcgef fcg bacf
+eagdbf de bacfgd abfce dfgab dfabe cfegda bedg fde cebagdf | dfgace cfgdba degb bged
+cefabg bcfgd decbg fdcgeab cdbae ceg bgefcd efgd eg cfgdab | bfgdc fbdcga gce adecb
+ecgabd ebgd gdc fdaegc dbcaf fcegdab acgeb agdcb eabfgc gd | gdbafec efacbdg bgeafc dfacb
+egbfac abg fgeca fgaedc dbfeg cbae acbfgd gefab ba bfcdgea | gab ab efbgca aecbfdg
+eadgcfb ge aegbd cedagf dagfb feabcd abcged dbeca cegb egd | debca fadcbe baedg ge
+cagfeb edabc gd gfdabe cdfg degcfab bgcfa dgbacf gbcda dgb | gd bfeacg afedgb dbaec
+ba bfad febcg decafg fdeac fdgcabe bca abdefc gacbde bcefa | badgce cba eacbf bcafe
+ac cedfa bdecgf dgfea fgbdac dfgabce abce edcfb caefbd fac | gafcbd ecfgbd fbgcde faegd
+bf eafcd caebg fgcb dcfbaeg abf bfaegd cbeagd baefgc acefb | gdbcefa cbeag fab bfa
+gcb ebcgd cfdbaeg dafcge cedfg dgfbce badec begf gb cbgdfa | fgaebdc gbdce gbfe afdcbg
+gfbdc dac bdeagf daebcf gecdaf fcgad geca ca gafed fbcdgae | bafcde dgbfc adebcf gcadf
+ecbgaf cadefb ec debc bgcdaef ace ecafd egdfba aedbf facgd | ec eca efcagb bfaed
+aef fbad ebacg afceb af fedcbg bfced cgadfbe fcbade gaecdf | bgcdef abgce efdbcg aebcg
+cafbde ba cabf agfed ecfbd gfebdac dbeagc abe cbgedf fdbae | abe gdaceb eba bea
+cbdfg ebg edagf be caegbd cbdgfae fgebd cefb cebgdf cbdgfa | bedgca be fbdcge edabcfg
+ebga cbdafg cafgebd eb aedgbf ecfgbd fcaed eafbd bed adgfb | caefd bfdga dcfea cdgabf
+efgdbac ab dgcfb abg afedg faeb dbegfa dacegf bdagf dagcbe | fbcgd gacbdfe cdbgf ab
+ga dbfca acge edfgab gab agfcb cabfge bfdcge dgfeacb efgcb | ag fbecg ag bfcgea
+fdcgbe bad cfbga ceadfb bdeacg bdafc ebdcgaf bcefd da afde | gefdbc daef fade afcdb
+dcagbf cbgef abg ab feagd beagcf cfbegd cbae fegab gdbeacf | gba ebgfa ab fecdgb
+cdbge aefcdb febca feadgb eagdbfc ecbgf gafc gbf ebacfg fg | gf gefbad gf dbecafg
+dgb efdgab becfga aebgc gd cgde cebagd bagcd cebdgaf afbdc | agcbd dg gbd gdec
+dcafebg ebdga degc ecgabd bge dfcgab efabgc feadb gadbc ge | badcg acgedb adebf badge
+aegbfdc fa fagebd dfeac fae eadcgb edgfc bcfa abefcd bdace | fbca ecdbfa agecdfb dcfae
+gbdcea gcfa ecdafbg bagfe bgc ecfdb gecbf fgaedb abfgce cg | dbafge bgaefd edcbf faebg
+cfdegab dbgcfa ebf fe fcaeb fecdba cbage abcfd gfbead cefd | fcbea ef fe bceaf
+dfebga fde bgfd fd gdcbea cebafd dgabe fegad cdeagfb acfge | fgeca cdeabg gdceab fd
+fgeda fcdegb gdbaef dbfcega fad acfeg fgabdc baed da dgfeb | gdefa afd acfge efgbd
+daecbg ace abcgfd dcbegfa efcag dafe ae cbegf gfcda agedcf | aedbgc gacef gadfce egfcb
+dfacb egdac daecgb ceb be begafc edgb cadebfg edcba egfcad | abcegd cfdbage acbdf aegcfbd
+cdfae afgced dbgac fcebad gfdbea badcf fb adcfebg cbef bfd | bafgde begfad bgcda aebfcd
+gace eabdgf gcedf gfaedc efbdc edg ge gacbfed dfcga cfgbda | acge eg dfceg gefbad
+abdcf bdegfa bgedfca ce geafd dfeagc edc aedfc fegc gacdbe | dcfaeg ecd cde aegfbd
+egdbcf agdfbc gacdebf dec gdcfb gebda ec dafebc cgfe dcegb | cfbeadg efgdbc gcebfd ecd
+dafge acefg ecgb cfagdb ebfcagd cgfab ec ecf aedcfb acbefg | becg ec gecbaf adfgbec
+bad dafgc cgebd efbdcg cbedgfa cgabd bfeagd ab dgecba cbea | edcfabg fadcg dba gfcda
+dcefag bcagd ecfag gfacbde fgcaeb cfagb afb efbagd ecfb bf | afdecg ebagdf bcfe fb
+aedgcbf dacefg bfgce dgfebc dbcfag fb cefgd gabce bfc fbed | acgdfb bfegc geabc edgfac
+df aebdgcf gdcba fcbad cbdage bdcagf deagcf fdbg aefbc afd | cdfba df cebfa daf
+edcgf bfeadg bfdea bg gfbed gfba eafcdbg dcfaeb bge degbca | begcda aebfd fbag fedgc
+dbfgaec bcf edcb abfeg egfcb fgbdca gcafed bc bfcdge cdfeg | dgefcba cfgbde ecdgf cb
+eafg gbdaf gcabd fecbda dgebcaf cdfebg adfgbe bgf gf bdfea | gcadb fage gaef afdceb
+debagfc cbdfa gebc cfgaed gc aegfdb cdfebg ebgdf cfg bcdgf | eafbdcg dgfebca deafcg gadefc
+adg abced fbega dg abegcf fgde cfegadb gdabe aegfbd gdbacf | abecd afgbce gdabfc dag
+efacg fagb ebgdfca dfcabe gcdbea fa fbaceg cegfd geacb fca | edgfc fca fa cgeba
+fbadcg caebdg egfbd fdgcb gdbca fbc egdbacf facd fc egcbaf | acdgb egfbca gbceda gfcbd
+adfge bfea fb fagbdc bdf edfbag ecdbg fgbed dbgafce ecgadf | dbefg bdegf aegcdf fdeagc
+ebgdc afecg dcfgeb gbf cfbd dbaecg bf ecbfg agfdecb dbgfea | afgbcde gefbc fb gcebdf
+fga efdab fgdcea bagc fbgcea gfebc abdcegf cbgfde gfbea ga | dgceaf gfa ag cbefg
+gead dfaebgc ag fgcead dacef fdecba adgcf fgcbea cga bgdfc | faced fgbcd bgfeac fagcbe
+bdfaceg gafbcd cfae daebg gecdf edcag cdegfa cga ecbgdf ac | gdeca agc face ac
+dbgcf eg badfe edgbcf gbe aefbgdc eabfcg dgfbac decg fgdeb | cfgbad abdfe eabdf egb
+fcbgad gfcadbe eadb bcadf cfedba bce be fecgd cgabef efdcb | fgcabe ebad edba fdcbga
+df bedgf bcgedf bcaegd dcgf eacbdf ebcdg dfb agedfcb egfab | dcgf fdb edbgc egdacfb
+facdb eca fceagd cfeba dcbe fbcead ec afdbgc acdgbfe begfa | fdeagc ce aec ec
+ecfbad gdabefc edb be bceg abdfg dacgef gbaed cedag cebdga | eb adgfb gcade egcb
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+db eacgdf bgd gcbad afdcebg fcgbed dfab aebgc dfbcga fcagd | agcdf dbg gafcbd fecagd
+fdge cgd eadfcb gd gbfdc bcfga cbefadg cfbde deabcg gbcefd | dgfe acfebd fbcdg ecdagb
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+gb bgd bcdag adecb edbfag cdeagbf cfedab acfdg eagdbc cgeb | dcagb acfgedb dbg dbg
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+dgcfeb dbefg ecfgd bge bafecg fgadce eb cdbe degcfba gadbf | be acegdbf cdgfbe abgfd
+ab gfdbae dagfe agdfb bad facgde gfbdc dacfgeb aebg dbfcae | gabe bfgdae caedfb bcgeadf
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+dbgcef acef cbe cbfedga decab acefdb fdbcga ce gbaed dbfac | ce fecabd daebc ebcdgf
+db dcbaf egcfbad fbdeca ebdc egbfad cbagf bfd ecfagd aefdc | dagfbe cdeb cfbead fabcd
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+baegc bd daefgc fadgc gfdb cbd ebacfd cdbgaf dgcabef cgbad | daebfcg fcbaed bd cgfabd
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+gefcbd eafdg cdbagef aegfc dg gbfcae dgf aefdb dgac adgcef | dgca feagbc dg agefcd
+dbfeca ebcaf cag gafceb gcabefd bfga ga adgcfe ecdgb aecgb | gdbcafe agc cga afbce
+ecdbfa cebdgaf efdbga bagfc gacbed cd cdfe dbfca ebdaf dac | daebf ecfd dfec cfed
+agcef bf afbced badecg edfgbc efgabdc fegbc cbged fbe bfdg | dgfb fbdeca dagceb gcbed
+daefgb cbaeg cegd gea cfbgad bfcea eg fadecbg bedagc abdcg | aeg ge gefdab ge
+gfbca bac aebcfd dbcfag gdeacf bc gdafc dgbc ebafg ecbgdfa | cba dgcb cbdg eabfdc
+dbegc gacfbd cegfab gabefdc bcgfe ef bfagc feg fdgeab feac | abfdcg afec gdbfea fdgaceb
+bfcea cd cde dcfbeag gabed fegdca fdcb abgecf ebdca fabcde | efbac bfeagc cabdfe cfgabe
+
diff --git a/day_9/code.js b/day_9/code.js
new file mode 100644
index 0000000..c5c6676
--- /dev/null
+++ b/day_9/code.js
@@ -0,0 +1,115 @@
+const readline = require('readline')
+const rl = readline.createInterface({
+  input: process.stdin,
+  terminal: false
+})
+
+lines = []
+rl.on('line', (line) => {
+	let raw = line.replace('\n', '').replace(' ', '')
+	if (raw.length > 0) {
+    	lines.push(raw)
+	}
+})
+rl.on('close', () => {
+	const db = false
+
+	let rows = lines.map(l => l.split('').map(nb => parseInt(nb)))
+	//console.log(rows)
+
+	// first part: find low points
+	let lowPoints = []
+	let lowPointsCoord = []
+	for (let i = 0; i < rows.length; i++) {
+		for (let j = 0; j < rows[i].length; j++) {
+			let val = rows[i][j]
+			let toCmpWith = [[i-1, j], [i, j+1], [i+1, j], [i, j-1]]
+			let success = true
+
+			for (var k = 0; k < toCmpWith.length; k++) {
+				let [ y,x ] = toCmpWith[k]
+				if (
+					y < 0 ||
+					y >= rows.length ||
+					x < 0 ||
+					x >= rows[i].length
+				) {
+					// ignore, because these point don't exists
+					continue
+				}
+				// important: you have to use less or equal HERE!
+				if (rows[y][x] <= val) {
+					success = false
+					break
+				}
+			}
+			if (success) {
+				lowPoints.push(val)
+				lowPointsCoord.push([i, j])
+			}
+		}
+	}
+
+
+	// second part: find bassins
+	let findBassin = (alreadySeen, toSee) => {
+		if (toSee.length == 0) {
+			return []
+		}
+		const e = toSee[0]
+		const [y,x] = e
+		// check if the point exists
+		if (
+			y < 0 ||
+			y >= rows.length ||
+			x < 0 ||
+			x >= rows[y].length
+		) {
+			return findBassin(alreadySeen, toSee.slice(1))
+		}
+		// check if it's 9
+		if (rows[y][x] == 9) {
+			return findBassin(alreadySeen, toSee.slice(1))
+		}
+		// check if it's already seen
+		if (alreadySeen.filter(([_y, _x]) => _y == y && _x == x).length > 0) {
+			return findBassin(alreadySeen, toSee.slice(1))
+		}
+		neighbours = [[y-1, x], [y, x+1], [y+1, x], [y, x-1]]
+
+		res = findBassin([e, ...alreadySeen], [...neighbours, ...(toSee.slice(1))])
+
+		return [e, ...res]
+	}
+
+	let bassins = lowPointsCoord.map(c => findBassin([], [c]))
+
+	let bassinsSizes = bassins
+		.map(b => parseInt(b.length))
+		.sort((a, b) => a - b)
+		.slice(-3)
+
+	bassinsSizesProduct = bassinsSizes.reduce((a, p) => a*p)
+	let bassinsCoords = bassins.flat()
+	
+	// output mini map of bassins
+	if (db) {
+		for (var i = 0; i < rows.length; i++) {
+			rowOutput = ''
+			for (var j = 0; j < rows[i].length; j++) {
+				if (bassinsCoords.filter(([y, x]) => y == i && x == j).length > 0) {
+					rowOutput += '\033[1m' + rows[i][j] + '\033[0m'
+				} else {
+					rowOutput += rows[i][j]	
+				}
+			}
+			console.log(rowOutput)
+		}	
+	}
+
+	let risks = lowPoints.map(height => 1+height)
+	let sum = risks.reduce((e, s) => e+s)
+
+	console.log(`Sum of the risk level of low points: ${sum}`)
+	console.log(`Product of 3 largest bassins size: ${bassinsSizesProduct}`)
+})
\ No newline at end of file
diff --git a/day_9/example.txt b/day_9/example.txt
new file mode 100644
index 0000000..610bad9
--- /dev/null
+++ b/day_9/example.txt
@@ -0,0 +1,5 @@
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678
\ No newline at end of file
diff --git a/day_9/input.txt b/day_9/input.txt
new file mode 100644
index 0000000..cfc9531
--- /dev/null
+++ b/day_9/input.txt
@@ -0,0 +1,101 @@
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