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-rw-r--r--2021/10/example10
-rw-r--r--2021/10/first.go66
-rw-r--r--2021/10/input90
-rw-r--r--2021/10/second.go86
4 files changed, 252 insertions, 0 deletions
diff --git a/2021/10/example b/2021/10/example
new file mode 100644
index 0000000..b1518d9
--- /dev/null
+++ b/2021/10/example
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
diff --git a/2021/10/first.go b/2021/10/first.go
new file mode 100644
index 0000000..0c96fe8
--- /dev/null
+++ b/2021/10/first.go
@@ -0,0 +1,66 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+)
+
+type stack []byte
+
+func (s *stack) push(b byte) {
+ *s = append(*s, b)
+}
+
+func (s *stack) pop() *byte {
+ l := len(*s)
+ if l == 0 {
+ return nil
+ } else {
+ elt := (*s)[l-1]
+ *s = (*s)[:l-1]
+ return &elt
+ }
+}
+
+func main() {
+ score := 0
+ s := make(stack, 0)
+
+ scanner := bufio.NewScanner(os.Stdin)
+out:
+ for scanner.Scan() {
+ line := scanner.Text()
+ for i := 0; i < len(line); i++ {
+ c := line[i]
+ if c == '(' || c == '[' || c == '{' || c == '<' {
+ s.push(c)
+ continue
+ }
+ b := s.pop()
+ switch c {
+ case ')':
+ if *b != '(' {
+ score += 3
+ continue out
+ }
+ case ']':
+ if *b != '[' {
+ score += 57
+ continue out
+ }
+ case '}':
+ if *b != '{' {
+ score += 1197
+ continue out
+ }
+ case '>':
+ if *b != '<' {
+ score += 25137
+ continue out
+ }
+ }
+ }
+ }
+ fmt.Println(score)
+}
diff --git a/2021/10/input b/2021/10/input
new file mode 100644
index 0000000..5bdcea7
--- /dev/null
+++ b/2021/10/input
@@ -0,0 +1,90 @@
+{<{<[{<[<([[(<<>[]>[<>()]){(()<>){<>{}}}]<{<{}<>){()<>}}[[()[]]{(){}}]>]{<([[]][{}<>]){<{}<>>{[]<>}}><[(
+[<{(([{<[(<{[{()()}{()[]}]{[<>[]]}}>)[[{[<[][]>(()[])]<({}<>)<()<>>>}([({}{}){[]<>}])]<{{([][])[()
+([<[{[{[{(<{<[[]][[][]]>[(<>[])<[]()>]]<({()<>}([]<>))>>)((([[{}{}]](<(){}><[]{}>))<<{{}[]}[<>()]><[[][]](()(
+(<<<{{{[[<(((<[]()><{}{}>)([<>{}](<>{}}))([(()())[[]<>]]<{[]()}(<>[])>))[[[<{}[]>({}{})]]<{[<>()]((){})}<<[][
+{{[<{([[[([(<(<><>)>{([][]){()[]}})<{{{}()}<()<>>}>])]]<({<{(<()<>>([][]))<<(){}>]}{{<()()
+<[{({[(<[<{{<(<>[])<[][]>]}}((((()<>)<<>[]>)[[<>{}]<{}>]){{(()[])}})>(<<(([]{})<<>[]>)[([][])
+((<[[(([{[[{((()())[{}{}])([(){}]<{}[]>)][[{{}{}}[[][]]][(()())(<>[])]]]{<[[{}[]]]<<()<>>[
+([(<<(<<[[<{{([]())[()<>]}<{<><>}[<>[]]>}{<<[][]>[[][]]><[[]<>}({}<>)>}>[[<([]{})>{({}{})[()[]]}][<{[]
+<<[[<{[<<[<<[{<>[]}({}[])]<[[][]]<{}()>>>((<{}[]>{{}{}}>(<<>{}>([]{})))>(<(<[]()>(<>{}))<((){
+<{<[[<([[[[[<[{}{}](<><>)><{()<>}[{}()]>]{<<()()>{{}{}}>[[()<>][{}()]]}]{{({[]()}[[]<>])(<<>{}>
+([{[[<(({<((({()()}({}{}))<<{}()><[]<>>>)([{{}<>}][<[][]>(<><>)]))>{{[[[{}[]]([]<>)][{()<>}]][([[]{}]{<>[]})]
+(<(<{<{{({<({[{}[]]<(){}>}[<<>[])(<>{})])[[<{}<>>[[]<>]][([]{})<<>[]>]]>[{([{}<>]([]<>))<[<>()
+(({[[[<{([[{<[{}()]<[]<>>>}]{<[<{}>{<><>}]>{{(()[])}<[<>{}]{<>[]})}}]{[[<[<>]{{}[]}><[()[]]{{}
+{[[{{<({{<<<{[<>()]{{}()}}[([]<>){()<>}]>>(<{(<><>){[][]}}[{[]{}}([][])]>{[{()[]}{<>}}{{{}{}}<
+(<<[{[[{<<{{{<[]()>}}<[{()()}(<><>)](<(){}>[{}[]])>}<{{[()[]]([]{})}}{{((){}){[]()}}[({}{})<
+<<<{<{{([<<{[{<><>}((){})]{(<><>)(()<>)})<{[{}<>]{<>()}}{<()[]><(){}>}>>>{{<<<[]()>{()[]}>({
+{[(<[[{[(({<(<{}<>>{<>()}>({[]{}})>[[(()<>){<>[]}][[<><>]{<>{}}]]}))[[{{[<()[]>(()<>)]}}([([<>{
+<([({((<((({[<()<>>]<<()[]>(()[])>}{({()[]}[[]{}])})<[{[()<>](<>{})}<(<>{}){()[]}>]<((()())[[]()])>>))><
+{{([([(<((([[({}[])(<>{})][<()()>{<>()}]])[{{[()<>]{{}()}}<[()()][()[]]>}]){{{[{[]()}]}<[<<>(
+<[[{((<{{{(<((<>{})[{}[]])(<()[]><()()>)>{[{<>()}[()[]]]{{[]<>}<<><>>}})}(<{<(<>)[()]>}>)}<{<[([<>{}][(){}])
+<{[<[{[<{[(<[[<>[]]<{}<>>]>[[<<>[]>{{}[]}]{({}[])[[]<>]}])]{{{<<{}{}>{<>()}>[{()<>}{(){}}]}{<[()()][(){}]
+({<([<[<((<({({}[])<[][]>})[<[<>()]([]{})><(<><>){{}[]}>]>))[<[<([[][]]{{}[]})>](<(<<>()>)(<{}<>>)>)>]>]>]
+{{{[{{<<{<[<(<<>[]>[{}{}])>[[{{}<>}<<>[]>][[[]<>]<[]{}>]]]{<({()<>}((){})){[[][]]<[]>}>[<(<>[])>([{
+{<({[{{{(<{<[<[]<>>]{{{}[]}<<><>>}>{[[<>[]]<{}[]>]}}(<(<()()><{}[]>)>{[[()()][()<>]]})><(({[()()]}[[[
+<<[{<{{<(<({[<()()>{()<>}]((()[]){[]{}})}{[(()[])[{}{})]{({}<>){<>()}}}){({<{}<>>[{}]}(<{}[]>))[{[[]
+<[((<[{<<<(({[[]{}](<>)}{({}{})})(({{}{}})<{()()}>})<<([()[]]{<>()}){([]()){<><>}}>>>>{(<<{<{}()>{()<>}}(
+{(({[[<{[{[(({{}<>}(()[]))[([]{}){()()}])](<<{{}()}{<>{}}><<{}[]><{}()>>><[[<>()][()]]({<>
+[[({<(<[[({[{<{}[]>(()<>)}<{()()}>][[[{}<>](()[])]{(<><>){()<>}}]}[([{<><>}<<>()>]<{{}()}<<>{}>>)[{{(
+[[<(([<{{{<{({<>{}}{<>{}})}<[<{}[]>(<>[])]<((){})>>>{[{<{}[]>{{}[]}}{<[][]>{{}<>}}]{(<[][]>{()))<<[]{}>{(
+(<[{<<({<<{{(([]()){[]()})[({}{})]}({({}{})<{}{}>}(({}){{}<>}))}{<<<{}{}><{}()>><[{}()][[]]>>}>>[<{({({})[<>
+{([(<([[<{(<({()[]>[<><>]){[[]<>](<><>)}>{{[()<>]({}{})}<{<>[]}[(){}]>})}{(({<[]()>{{}()}}{{<>()}(<
+(<<[{([<[{{[[([]{})]<(()<>){<><>}>]<[{<>[]}<{}[]>]>}<<{([]<>)[{}<>]}(([]<>)<<>()>)>[<{<>{}}
+<[([[<<<<<({<[()[]]>}[<({}<>)>])[[({{}()}(()<>))<<<><>>{[]{}}>]{{[<>()][[][]]}{<{}{}>({}())}}]>[{{{[
+[<{[(<[<<{<(<{<>()}>[{{}()}{{}{}}])>}>([<[<[[][]]>((()<>)<(){}>)]{(<()>)(<<>[]>({}()))}>([[<[]<>>
+<[(([<{(<<<{{<[]<>><[]<>>}{<()[]>(<>())}}<{<<>()>{[]}}(<()<>>[[]{}])>>>[<{([()[]]<{}()>)<<{}{}>{{}[]}>}{((<
+[{<[{[([(<({<<<>{}><<><>>>{(()()){()[]}}}({[<>[]]<<><>>}([()]({}<>)))){{{[[]{}]{{}<>}}[(<>{}){<>}]}[<{[][]}
+<<<{({[(({[{({<><>}([][])){{<><>}[(){}]}}(([{}{}][{}[]]))]({<({}<>){{}()}>[[{}[]]{[]{}}]}}}))]<[[<(<{{()
+[(([[(<({{({(<()()>(<>{}))}({<[]<>>{[]<>}}<[<><>]{[]<>}>)]<([[[]{}][[]{}]]{([][]){()<>}}){{[{}
+<{(<[<{<{([{([()[]]<(){}>)([[]<>]({}()))}](<([[]<>]<<>{}>)[{[]{}}[<><>]]>))}>}>[{<({<<[(()()
+[{({[({<[((({[<>()]<[][]>}{{<>}{(){}}})([(()<>)<<><>>][({}{})<<>[]]]))<<<{{}()}<[]<>>>(<()[]><[]()>)>
+[[<{((<<(<<{(<<>[]>[(){}])(([]<>)([]{}))}<[[(){}]<[]<>>]{(<>())(<>)}>>>)>[{<[{{[<>{}]{[]()}}[
+<([{{{<([([([<(){}><()[]>])([[{}<>]]{[()<>>({}())})]<[<{()[]}{()()}><[[]()][<><>]>]>)]<{({((()()
+<<{([<[[{<[<(({}<>)(()()))({{}[]>[<>()])>{[<{}>]<[{}{}]>}]([{{[]{}}[{}()]}{[()<>]{<>}}]{([<>{}][[]()
+({[[[[(<<{{[{(<>[])[{}]}[<[]<>>[<><>]]]}}([<([<><>]{<>{}})[<[]{}>[<><>]]>{(<()<>>[{}])[([][])[{}{}]]}])>>(
+<({<(<<[({[{{{{}[]}<<><>>}[([][])(()<>)]}]<<[[{}]{<>()}]>>}<<<{<<>[]>([]())}<({}())[<><>]>>{<{<>{}
+(<({{<{[{[({[{[]<>}{()[]}]}<{{{}()}{[]<>}}<<{}<>>[{}{}]>>)[[({{}<>}[<>()])<[{}[]][()()]>]}][{{<[[]{}][[]()]
+(<<[((<{<<{[[{<>{}}[<><>]]{{{}{}}{<>[]}}]<[{()()}([]())](({}()){()[]})>}>)<((<<[{}[]]>[{<>[]}([]{})]>)({({[]<
+([({<<(({((<{[{}[]]<()<>>}{[{}<>][{}()]}>)<<(<{}[]>[[][]]){<()<>)<<>()>}><(<<><>><[]{}>)[<<>()>[<
+[([<[[(((((({<(){}>[{}{}]}([[]()]{()[]})))<[(({}<>)[<>{}])(([][])([]{}))](<[()()]{<>()}><[()[]]{()(
+({[({[{<<({<[(<>())<{}<>>]>[[(<><>)][{{}{}}[{}()]]]}<[([[]<>]([]<>))<[()<>]<()()>>]<{<{}[]>({}())}{<<
+(<<{(<<({{<<<<(){}>([]())>{[()()][{}{}]}>[([[]<>]{{}}){{{}{}}}]>}}{(({{(<><>){<>()}}}[({[]()})[[[]]{[]{}}]]
+((<[([((<[([{[<>()][()()]}{[{}<>][<>[]]}]<(([][])({}())){<()[]>([]())}>)[{{<<><>>([]{}}}[{<><>}<{}[]
+<{(<<[<<<{[{<<[]()>[()<>]>(([]{})([]<>))]{<([][])<<>{}>>{(<>()){()}}}](<{[<>[]]}([()()]{<>{}})>(<[()[]][
+[<{{[[[<[[{((([]())<{}[]>){(<><>)})[{{{}}}[({}[])({}{})]}}{{(([]<>)<<><>>)<([][])({}<>)>}{<<()[]><()()>>[<{}
+<<([(<<({<<(<(<>[]){()[]}>{[()<>)(<><>)})>{((<{}[]>(()[]))({[]<>}[{}{}]))<{<<><>>(<>())}<({}<>)[[]]
+<(<<{[<<[[[{<[<>{}]{<><>}>[<<>[]>[(){}]}}{{<{}{}>}(<<>()><[]()>)}]]{{([[[]{}][[]()]][[<>()][{}[]]]
+(<{<<{<{[{<{<[()()]<{}()]>{<<>()>({})}}>{[{<{}<>>}<<[]<>><[][]>>]<([{}{}][[]<>]){{[][]}{<>}}>}}]
+{{[[([<[[{<[[<[]()>[()<>]]<({}[])[{}[]]>]>}<[((([][]){[]}){<{}{}>((){})})][([([][])({}[])](<{}<>><<>{}>))]>
+[[{{({{[[[{<[{(){}}{[]<>}>[<{}[]>]>}]((<{<(){}><{}()>}[<<><>>({}{})]><<{{}{}}>(({}[]){()<>}
+[<<([<<({[<({{()()}[[]()]}({{}<>}[<>()]))>([[[{}<>]([][])][({}()){[]()}]])]((([[(){}](()<>)](({}{}>))
+<[{<{(<<([({[({}<>)[[][]]]{{[][]}<{}{}>}})([[[[]{}](<>{})]([<><>](()()))]{{([])[()()]}({<>[]})])]<<(({[](
+[((<<[<[{<[{{[()[]]({}())}([[]{}]<()[]>)}[(<[]()>{()[]})<<<>()>[()()]>}]({{[{}{}][()[]]}{{<>()}
+{{{{<[([([<({{[]()}<(){}>}{(()[])<<>()>})>{([({}[])<[]<>>][[[]()]])}]<{<((<>)[()<>])<(()<>)
+[[<{<([[([<[{[<><>]{(){}}}{(<>()){{}}}]>[[{{<>[]}{[]}}]]][<{[<{}()>]<[{}()][<><>]>}(<{[]<>
+((<[<{<<<{<<{[[]{}]}>{<(<><>)<<>()>>{(<><>)({}())})>{{<([]{})<[]()>>{[<>{}][()()]}}[<<<>{}>([]{})>[{{}}<()()
+<<({(<{[[<((<{<>[]}(()())>>[<[[]<>][<>{}]>])[(<{{}{}}><<<>()>>)(([[]()]{[]<>}))]><<[{<[]{}><()[
+(({({({<(([[{({}[])([]())}]({<<>{}>[()<>]}{<[][]>({}[])})][{{[[]<>]}}{[<<>><{}{}]]}])<<[{{()[]}
+<[(([<(<{[[([((){}){{}<>}]<[{}{}]{()<>}>)<<{<>[]}[(){}]><({}())([][])>>]<[{<()()>{<><>}}[(<>{}]([]())]][{
+{[<{([{<[{<[<<{}<>>[{}{}]>[[<><>](<>[])]]<{<(){}>([]<>)}{{()<>}([]())}>>{(<(<>)[()<>]>{[{}[]]
+{(((((<<[[{(([(){}]<[]()>)[<<><>>])<<{()}{<>[]}><(<>[]){{}{}}>>}({<[{}<>]([]<>)>{{{}{}}<<>{}>}}{([
+<{{<<<(<{{<([<()()>([]<>)]<{()()}<()<>>>){<<[]{}><[][]>><{{}<>}>}>{([[<>]{[]()}][<{}><[][]>])[{((){})<
+{{[{[{([{<{<[{()()}{()}]([<>{}][{}{}])><<[[]()]>({()<>}<[][]>)>}({((<>())({}()))[[{}()][<>[]]]}<{([]<>)<{}<
+{([<[<(<[([<[{<><>}[{}{}]](<{}<>>[[]<>])>[{{[][]}[{}()]}(<{}[]><{}{}>)]])]<<<[<(<><>)<<>>>{[{}()]}]<
+<<[(([[{{({(<[<>()][()<>]>[(()())((){})])(<((){})[()()]><[()<>]<{}[]>>)}{{<(()){{}<>}><<{}{}>{{}()}>}
+{({([({{(<((<(()[]){()<>}>[[()<>]]))>{[<[({}()){{}<>}){<<>[]>{()<>}}><[[{}()][<><>]][[<>()]
+[<([<{<<[[(<[{{}<>}{{}[]}]<(()[])<()()>>>[{[<><>][{}{}]}])>{[{<([]())[<>{}]>{<<><>>{(){}}}}{[(<
+({{(<{((<({{([()[]](<>))({[][]}{()()})}{(<<>[]><()[]>){((){})[<><>]}}})((<{(<>{}}<(){}>}{{<>{}}{<><>}}>{(
+[({[{{([({[{<{<>[]}[[]()]>}[(({}<>){<>[]})[{{}{}}<{}()>]]]}{[{[{<>()}](<<>()>(<>()))}][<(({}
+<{([[(<[{[{(<<{}<>>(<>{})><{(){}}<{}<>>>)(({()()}([]())){<[]{}>({}<>)})}[{<[(){}][(){}]>{{<>()}<(
+{[(<<<[<{[{({[<>()]{<>[]}})[<<<>()><{}())>([[]()]((){}))]}][[{<[<>[]]<<>()>>(({}()))}](<{<<>>{<>[]
+{{{({{<[{([[(([]())<<><>>)(([]{})[[]()])]((<{}[]>{[]()}))]<{<{<>[]}(()())>({<>[]}[<><>])}(((()()){<>[]}
+<[{[([{([[<(<([][]){{}[]}>([(){}][<>]))><({<()[]>[<>()]}[([]{})])>]({{[(<><>)(<>)]{([]())}}<<{<><>}<{}()
+[[(<[[(<([([{[{}{}]{{}()}}(({}<>)<[]{}>)]{<(()())>})]({{(([]<>)[[]<>]){[<><>]{<><>}}}}[<{<<><>>[<>{
+([[(({(<({<{<[<>{}]([]{})>([{}<>]<{}{}>)}[{{[]<>}[[]{}]}]>}{([([[]{}][{}()])([<>]({}<>))])<([[{
+{[[<[({{<({[{({}<>){[]<>}}[({})([]{})]]{<{{}[]}{[]{}}>}}(((<{}>[[]<>]))<(<{}[]>([]<>))>))[[{
+<((<(([(<<[[<{()<>}<{}<>>>{<<><>>{[]<>}}]({{[]<>}[[]{}]}<(<><>)([]<>)>)]><{<[[[]{}]<[]{}>]>}<(<{<>[]
+<[[<({[[<{<[<([][]){<>[]}><((){}){()[]}>]>}(<<<{(){}}[[]()]>({[]{}}(()<>))>><[({{}{}}[[]{}])(<<>()><<>[
+[<<[[[[({<{[[{()()}<()()>]{[[][]][[]<>]}][<<<>{}>[<>]>{{<><>}}]}<{[<<>{}>{{}()}]{<{}[]>})<[(())<{}{}>]
+{{{<<({(([{{[(<>{})<<>[]>][[[]{}]{()[]}]}<<({}())>{{<>()}<{}<>>}>}]<[<[<()()>{{}()}]<([]<>)>>[([[]]<<>[]>){[
+([[[(<{(({({<[{}()]<[]{}>>[<<><>>(<><>)]}[{<<>>([]{})}([{}[]]{<><>])]){[({()()}((){}))[[[]
diff --git a/2021/10/second.go b/2021/10/second.go
new file mode 100644
index 0000000..69bd104
--- /dev/null
+++ b/2021/10/second.go
@@ -0,0 +1,86 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "sort"
+)
+
+type stack []byte
+
+func (s *stack) clear() {
+ *s = make(stack, 0)
+}
+
+func (s *stack) push(b byte) {
+ *s = append(*s, b)
+}
+
+func (s *stack) pop() *byte {
+ l := len(*s)
+ if l == 0 {
+ return nil
+ } else {
+ elt := (*s)[l-1]
+ *s = (*s)[:l-1]
+ return &elt
+ }
+}
+
+func main() {
+ scores := make([]int, 0)
+ s := make(stack, 0)
+
+ scanner := bufio.NewScanner(os.Stdin)
+out:
+ for scanner.Scan() {
+ line := scanner.Text()
+ s.clear()
+ for i := 0; i < len(line); i++ {
+ c := line[i]
+ if c == '(' || c == '[' || c == '{' || c == '<' {
+ s.push(c)
+ continue
+ }
+ b := s.pop()
+ switch c {
+ case ')':
+ if *b != '(' {
+ continue out
+ }
+ case ']':
+ if *b != '[' {
+ continue out
+ }
+ case '}':
+ if *b != '{' {
+ continue out
+ }
+ case '>':
+ if *b != '<' {
+ continue out
+ }
+ }
+ }
+ score := 0
+ for c := s.pop(); c != nil; c = s.pop() {
+ score *= 5
+ switch *c {
+ case '(':
+ score += 1
+ case '[':
+ score += 2
+ case '{':
+ score += 3
+ case '<':
+ score += 4
+ }
+ }
+ if score != 0 {
+ scores = append(scores, score)
+ }
+ }
+ sort.Ints(scores)
+ fmt.Println(scores[len(scores)/2])
+}