Working on 2021 day 18
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100
2021/day18/input
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100
2021/day18/input
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@ -0,0 +1,100 @@
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[[[0,[6,6]],[[7,2],[6,2]]],[[[9,4],[5,8]],6]]
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[[[4,9],6],[[[0,1],[8,5]],[3,[7,6]]]]
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[[1,7],[[[1,3],2],[[6,8],8]]]
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[4,[[6,[6,0]],[[4,9],5]]]
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[[3,8],[[0,6],1]]
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[[2,2],[[[2,3],[2,9]],[[9,6],[4,9]]]]
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[[[3,4],[[7,7],[7,8]]],[[0,2],6]]
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[[[[4,4],[3,3]],[[9,0],4]],[8,[7,[6,6]]]]
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[[[9,9],8],1]
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[2,[[7,[1,9]],[9,2]]]
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[[[[6,0],[8,2]],[[9,0],[8,7]]],[3,[6,[8,8]]]]
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[[[8,[9,2]],[1,4]],[[2,2],[[1,0],5]]]
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[[[9,[0,3]],[4,[2,3]]],[[8,[0,1]],[[4,8],[5,4]]]]
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[[[2,0],[1,7]],[[3,[0,7]],[[7,6],0]]]
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[[[1,[5,1]],[[0,3],9]],[[3,8],[[5,3],1]]]
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[[[[4,5],2],[[7,7],[4,8]]],[3,[3,[6,5]]]]
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[[[[4,4],4],[[5,0],2]],[9,[[0,7],5]]]
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[[2,[[8,0],9]],0]
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[[[[0,5],[1,0]],[0,[5,1]]],[[[0,8],[6,0]],[6,[3,9]]]]
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[[[[2,4],[5,5]],[4,7]],[[[5,6],[9,5]],1]]
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[[[4,[5,1]],[[6,7],1]],[1,[[5,9],4]]]
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[[0,6],[[9,3],[4,2]]]
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[7,[[[2,4],[3,4]],[2,0]]]
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[0,[6,7]]
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[[[0,2],[[7,2],7]],[[[6,3],[2,0]],[[8,6],[7,9]]]]
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[[[7,[0,5]],7],[[2,3],[3,3]]]
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[[2,[0,[4,5]]],[[4,[7,9]],[[5,6],4]]]
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[[[5,4],0],[5,[[7,1],[7,6]]]]
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[[0,3],[[[5,2],5],[[8,5],[2,8]]]]
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[[[0,[8,9]],[[3,1],2]],[[3,[7,1]],7]]
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[[[[9,7],[5,5]],[[2,4],1]],[[1,3],[[4,0],[9,1]]]]
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[[[0,9],4],0]
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[[[[8,8],9],[[8,2],3]],[[2,[7,4]],[9,1]]]
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[[[1,2],8],[[[4,4],2],[2,4]]]
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[[6,[7,[2,1]]],[[2,1],3]]
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[0,[[[7,8],0],[5,[8,5]]]]
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[[[2,8],6],[6,[[1,1],[1,2]]]]
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[[[[3,9],2],[7,[4,9]]],[[[5,3],3],[[7,3],5]]]
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[[2,[4,[3,2]]],[[4,9],6]]
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[[[[1,1],[0,5]],[1,[4,9]]],[[6,[5,7]],[[1,6],[7,2]]]]
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[0,[0,[[8,5],8]]]
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[[[1,[2,5]],8],[[3,[0,2]],4]]
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[[[4,3],0],[[[6,9],[7,2]],[[1,9],8]]]
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[[[[7,1],0],[7,5]],[6,2]]
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[[[9,[6,5]],6],[[5,5],[[4,6],2]]]
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[[[[3,0],[5,5]],2],[7,[9,[8,5]]]]
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[9,[[9,7],[3,3]]]
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[[[0,0],4],[7,[[5,8],[2,7]]]]
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[[[[9,2],4],[[0,1],[4,1]]],[[4,[6,5]],5]]
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[8,[[[5,2],8],[6,0]]]
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[[[[9,6],2],9],[5,[[5,3],5]]]
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[[[8,[8,0]],[7,[3,3]]],[[[8,8],[5,5]],[[1,3],3]]]
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[[[2,3],4],[[[8,8],[1,4]],5]]
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[[[[3,7],9],6],[[5,[4,1]],4]]
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[[[3,4],[[5,3],4]],[[2,[4,2]],[[0,7],5]]]
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[0,9]
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[[2,[[9,1],[3,4]]],[[[5,7],[6,6]],[5,[3,6]]]]
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[[[[7,2],7],[[8,7],9]],[9,[[7,0],[3,4]]]]
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[[[[8,3],[0,2]],0],[5,[[9,9],1]]]
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[[[1,5],[[3,9],[5,6]]],[6,[2,[2,4]]]]
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[[[[1,6],7],[8,9]],[[[6,7],8],1]]
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[[5,[[1,3],[1,8]]],[8,1]]
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[[[[4,6],9],[[3,0],[2,4]]],3]
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[[[[6,6],[9,8]],[4,7]],[[6,8],1]]
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[[[9,[7,8]],[4,[0,3]]],[[8,[8,1]],8]]
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[4,0]
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[[[[1,8],[6,9]],[[1,5],[6,1]]],[[1,9],[0,1]]]
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[[[[1,8],[1,8]],[[6,2],[8,6]]],[[[6,8],3],[[8,0],[7,3]]]]
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[8,9]
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[[2,8],2]
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[[4,[[7,0],[1,8]]],1]
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[[5,0],[[[3,4],0],3]]
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[[[[7,5],2],6],[[9,2],[[5,0],[7,5]]]]
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[[8,[[0,0],[3,7]]],[1,6]]
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[[[[5,2],[5,1]],[8,6]],[2,[9,[5,4]]]]
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[[[6,[3,3]],[[0,4],0]],[[4,4],[[3,6],6]]]
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[[7,[[4,9],[9,7]]],[3,[[8,7],9]]]
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[[[[3,3],9],[8,[7,2]]],[[3,9],8]]
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[[[0,[9,2]],1],[6,[[9,7],8]]]
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[[5,[0,1]],[8,7]]
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[[[[0,7],5],8],[[[0,0],[7,1]],[2,[6,9]]]]
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[[5,[[3,3],7]],[[[1,3],[5,4]],[[0,8],[2,2]]]]
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[[[[7,4],5],[[9,1],[5,5]]],[[0,8],[0,[6,4]]]]
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[[0,[[9,5],[4,3]]],[[[2,7],[4,7]],6]]
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[[7,[[3,2],[7,9]]],[[[8,6],[1,8]],[5,[5,6]]]]
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[[0,[[3,3],0]],[[[5,2],[2,4]],[6,8]]]
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[[[6,[5,6]],9],[[[5,2],7],[[8,7],[2,4]]]]
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[[[[7,2],[8,2]],5],[[[4,5],[0,7]],6]]
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[[[[6,1],4],6],[[4,[7,8]],3]]
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[[[[2,6],[5,0]],5],[[3,[5,4]],[[2,3],[8,6]]]]
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[[4,[[1,3],[1,3]]],[[[5,1],2],[[7,3],[9,6]]]]
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[[8,[6,[0,0]]],[[[4,4],9],[6,2]]]
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[[9,7],7]
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[[[3,1],[[0,3],[5,2]]],3]
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[[1,5],[4,[0,[3,6]]]]
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[[[[4,9],[6,5]],[8,4]],2]
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[[[7,[1,5]],4],[[3,[4,6]],[7,[4,3]]]]
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[[[0,[5,7]],[[8,7],[2,6]]],[[4,5],5]]
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[[[2,3],[[9,5],[9,3]]],[[[2,5],9],[[9,1],8]]]
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[[[[4,4],4],[[4,0],9]],[[[5,3],1],[3,[7,6]]]]
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149
2021/day18/main.go
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149
2021/day18/main.go
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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var build *SNum
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for i := range inp {
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wrk, _ := ParseSNum(inp[i])
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if build == nil {
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build = wrk
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} else {
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build = build.add(wrk)
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}
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}
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fmt.Println(build)
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v := build.needsExplode(0)
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fmt.Println("Needs Explode:", v)
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v.explode()
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fmt.Println(build)
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/*
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full := inp[0]
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for i := 1; i < len(inp); i++ {
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full = fmt.Sprintf("[%s,%s]", full, inp[i])
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}
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*/
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}
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type SNum struct {
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parent, left, right *SNum
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regular bool
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value int
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}
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// ParseSNum returns an SNum and what's left of inp
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// after it was produced
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func ParseSNum(inp string) (*SNum, string) {
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// inp should always start with either a number or a '['
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var rest string
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s := SNum{}
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if inp[0] == '[' {
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s.regular = false
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s.left, rest = ParseSNum(inp[1:])
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s.right, rest = ParseSNum(rest[1:])
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s.left.parent = &s
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s.right.parent = &s
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return &s, rest[1:]
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} else {
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s.regular = true
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var num []byte
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for i := range inp {
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if inp[i] >= '0' && inp[i] <= '9' {
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num = append(num, inp[i])
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} else {
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s.value = h.Atoi(string(num))
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return &s, inp[i:]
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}
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}
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}
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return &s, rest
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}
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func (s *SNum) needsExplode(depth int) *SNum {
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if depth == 4 && !s.regular {
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return s
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}
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if s.regular {
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return nil
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}
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if tst := s.left.needsExplode(depth + 1); tst != nil {
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return tst
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} else if tst := s.right.needsExplode(depth + 1); tst != nil {
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return tst
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}
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return nil
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}
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func (s *SNum) explode() {
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if s.parent == nil {
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return
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}
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s.parent.addToRegularRightOf(s.right.value, s)
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s.parent.addToRegularLeftOf(s.left.value, s)
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}
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func (s *SNum) addToRegularLeftOf(v int, c *SNum) {
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if s.right.regular {
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s.right.value += v
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} else {
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if s.right != nil && s.right == c {
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r := s.left.findRightmostRegular()
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if r != nil {
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r.value += v
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}
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} else if s.left != nil && s.left == c {
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s.parent.addToRegularLeftOf(v, s)
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}
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}
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}
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func (s *SNum) addToRegularRightOf(v int, c *SNum) {
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if s.left.regular {
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s.left.value += v
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} else if s.left != nil && s.left == c {
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l := s.right.findLeftmostRegular()
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if l != nil {
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l.value += v
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}
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} else if s.right != nil && s.right == c {
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s.parent.addToRegularRightOf(v, s)
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}
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}
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func (s *SNum) contains(n *SNum) bool {
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return s == n || s.left.contains(n) || s.right.contains(n)
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}
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func (s *SNum) findRightmostRegular() *SNum {
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if s.regular {
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return s
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}
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return s.right.findRightmostRegular()
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}
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func (s *SNum) findLeftmostRegular() *SNum {
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if s.regular {
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return s
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}
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return s.left.findLeftmostRegular()
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}
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func (s *SNum) add(n *SNum) *SNum {
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return &SNum{
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left: s,
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right: n,
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}
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}
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func (s SNum) String() string {
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if s.regular {
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return fmt.Sprintf("%d", s.value)
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}
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return fmt.Sprintf("[%s,%s]", s.left, s.right)
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}
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58
2021/day18/main.go.stringparse
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58
2021/day18/main.go.stringparse
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package main
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import (
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"fmt"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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build := inp[0]
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for _, v := range inp[1:] {
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build = fmt.Sprintf("[%s,%s]", build, v)
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}
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// Keep on steppin' until no change happens
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var wrk string
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var done bool
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for !done {
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wrk = step(build)
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done = wrk == build
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build = wrk
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}
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fmt.Println(wrk)
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}
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var steps int
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func step(inp string) string {
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steps++
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// Find the first number that needs to explode.
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wrk := explode(inp)
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if wrk != inp {
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return wrk
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}
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// Nothing exploded, look for a split.
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return split(inp)
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}
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func explode(inp string) string {
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var depth int
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for i := range inp {
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if inp[i] == '[' {
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if depth == 4 {
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// Explode the leftmost pair from here
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}
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depth++
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} else if inp[i] == ']' {
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depth--
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}
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}
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}
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func split(inp string) string {
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return inp
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}
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7
2021/day18/testinput
Normal file
7
2021/day18/testinput
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@ -0,0 +1,7 @@
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[1,2]
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[[1,2],3]
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[9,[8,7]]
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[[1,9],[8,5]]
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[[[[1,2],[3,4]],[[5,6],[7,8]]],9]
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[[[9,[3,8]],[[0,9],6]],[[[3,7],[4,9]],3]]
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[[[[1,3],[5,3]],[[1,3],[8,7]]],[[[4,9],[6,9]],[[8,2],[7,3]]]]
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@ -148,7 +148,7 @@ func Atoi(i string) int {
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var ret int
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var err error
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if ret, err = strconv.Atoi(i); err != nil {
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log.Fatal("Invalid Atoi")
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log.Fatal("Invalid Atoi:", i)
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}
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return ret
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}
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