From 2469a641db9ed804309467b99633db99cd60a383 Mon Sep 17 00:00:00 2001 From: Brian Buller Date: Mon, 3 Dec 2018 16:01:42 +0000 Subject: [PATCH] 2018 Day08 Complete --- 2018/day08/day08.go | 128 +++++++++++++++++++++++++++++++++++++++++++ 2018/day08/input | 1 + 2018/day08/problem | 90 ++++++++++++++++++++++++++++++ 2018/day08/testinput | 1 + 4 files changed, 220 insertions(+) create mode 100644 2018/day08/day08.go create mode 100644 2018/day08/input create mode 100644 2018/day08/problem create mode 100644 2018/day08/testinput diff --git a/2018/day08/day08.go b/2018/day08/day08.go new file mode 100644 index 0000000..a580961 --- /dev/null +++ b/2018/day08/day08.go @@ -0,0 +1,128 @@ +package main + +import ( + "bufio" + "fmt" + "log" + "os" + "strconv" + "strings" +) + +var top *Node + +func main() { + inp := StdinToString() + hackTheGibson(inp) + part1() + part2() +} + +var nodeIndex byte + +func hackTheGibson(inp string) { + parts := strings.Split(inp, " ") + var rem []int + for i := range parts { + rem = append(rem, Atoi(parts[i])) + } + top, _ = parseNode(rem) +} + +func parseNode(vals []int) (*Node, []int) { + id := nodeIndex + nodeIndex = nodeIndex + 1 + retN := &Node{ + id: id, + ChildCount: vals[0], + MetaCount: vals[1], + } + rem := vals[2:] + children := retN.ChildCount + if children == 0 { + retN.Metadata = rem[:retN.MetaCount] + return retN, rem[retN.MetaCount:] + } else { + var cN *Node + for children > 0 { + cN, rem = parseNode(rem) + retN.Children = append(retN.Children, cN) + children-- + } + retN.Metadata = rem[:retN.MetaCount] + rem = rem[retN.MetaCount:] + } + return retN, rem +} + +func part1() { + fmt.Println("= Part 1 =") + fmt.Println("Sum:", top.recurMetaSum()) +} + +func part2() { + fmt.Println("= Part 2 =") + fmt.Println(top.value()) +} + +type Node struct { + id byte + ChildCount int + MetaCount int + Metadata []int + Children []*Node +} + +var indent int + +func (n *Node) value() int { + var ret int + if n.ChildCount == 0 { + for _, v := range n.Metadata { + ret += v + } + } else { + indent++ + for _, v := range n.Metadata { + if v > 0 && v <= n.ChildCount { + ret += n.Children[v-1].value() + } + } + indent-- + } + return ret +} + +func (n *Node) recurMetaSum() int { + var ret int + for _, v := range n.Children { + ret += v.recurMetaSum() + } + for _, v := range n.Metadata { + ret += v + } + return ret +} + +func (n *Node) string() string { + ret := fmt.Sprintf("[ %d: %d %d ]", n.id, n.ChildCount, n.MetaCount) + return ret +} + +func StdinToString() string { + var input string + scanner := bufio.NewScanner(os.Stdin) + for scanner.Scan() { + input = input + scanner.Text() + } + return input +} + +func Atoi(i string) int { + var ret int + var err error + if ret, err = strconv.Atoi(i); err != nil { + log.Fatal("Invalid Atoi") + } + return ret +} diff --git a/2018/day08/input b/2018/day08/input new file mode 100644 index 0000000..b7abb41 --- /dev/null +++ b/2018/day08/input @@ -0,0 +1 @@ +7 11 7 2 5 5 3 5 1 8 0 7 7 1 2 3 5 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5 8 1 2 1 3 1 2 2 2 1 9 0 6 2 8 8 5 1 1 2 2 2 1 1 3 1 2 2 2 4 4 3 2 3 4 5 5 3 7 1 5 0 8 1 2 9 8 1 4 5 8 1 1 1 3 3 1 7 0 9 2 3 9 5 1 3 1 9 7 1 3 2 3 1 1 1 1 9 0 8 1 5 4 2 5 9 1 1 3 2 2 1 3 2 1 1 1 3 4 3 3 2 4 2 3 6 1 9 0 11 7 2 4 6 1 8 5 5 2 4 5 2 2 3 1 1 1 2 3 3 1 8 0 9 6 9 9 2 8 9 8 5 1 3 2 3 1 1 3 3 2 1 7 0 9 5 1 2 4 5 7 3 2 1 1 1 1 1 1 1 1 2 5 5 3 4 3 3 4 1 9 0 9 4 4 3 1 4 3 9 4 8 1 2 1 2 2 2 1 3 1 1 5 0 10 3 5 9 8 8 4 3 9 8 1 1 1 1 3 1 1 5 0 7 2 1 9 8 5 1 5 3 2 2 1 2 3 5 2 4 3 6 1 9 0 11 5 3 1 3 7 1 7 1 5 1 9 1 1 1 1 2 3 3 3 3 1 5 0 6 1 6 9 5 8 8 2 3 3 3 1 1 9 0 7 2 5 1 5 2 2 1 2 3 1 1 1 3 2 3 3 4 3 3 4 4 2 3 6 1 6 0 8 9 3 6 8 1 9 4 2 1 2 2 1 3 2 1 7 0 6 6 1 8 2 5 6 1 2 3 3 3 2 1 1 6 0 8 9 1 8 3 1 5 3 5 3 1 1 1 2 1 2 4 4 5 4 5 3 7 1 2 6 9 7 6 7 6 7 6 7 2 9 1 7 1 diff --git a/2018/day08/problem b/2018/day08/problem new file mode 100644 index 0000000..e974105 --- /dev/null +++ b/2018/day08/problem @@ -0,0 +1,90 @@ +Advent of Code + +--- Day 8: Memory Maneuver --- + + The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither you nor the Elves know which way the North Pole is from here. + + You check your wrist device for anything that might help. It seems to have some kind of navigation system! Activating the navigation system produces more bad news: "Failed to start + navigation system. Could not read software license file." + + The navigation system's license file consists of a list of numbers (your puzzle input). The numbers define a data structure which, when processed, produces some kind of tree that can + be used to calculate the license number. + + The tree is made up of nodes; a single, outermost node forms the tree's root, and it contains all other nodes in the tree (or contains nodes that contain nodes, and so on). + + Specifically, a node consists of: + + * A header, which is always exactly two numbers: + + * The quantity of child nodes. + * The quantity of metadata entries. + + * Zero or more child nodes (as specified in the header). + * One or more metadata entries (as specified in the header). + + Each child node is itself a node that has its own header, child nodes, and metadata. For example: + + 2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2 + A---------------------------------- + B----------- C----------- + D----- + + In this example, each node of the tree is also marked with an underline starting with a letter for easier identification. In it, there are four nodes: + + * A, which has 2 child nodes (B, C) and 3 metadata entries (1, 1, 2). + * B, which has 0 child nodes and 3 metadata entries (10, 11, 12). + * C, which has 1 child node (D) and 1 metadata entry (2). + * D, which has 0 child nodes and 1 metadata entry (99). + + The first check done on the license file is to simply add up all of the metadata entries. In this example, that sum is 1+1+2+10+11+12+2+99=138. + + What is the sum of all metadata entries? + + Your puzzle answer was 36891. + +--- Part Two --- + + The second check is slightly more complicated: you need to find the value of the root node (A in the example above). + + The value of a node depends on whether it has child nodes. + + If a node has no child nodes, its value is the sum of its metadata entries. So, the value of node B is 10+11+12=33, and the value of node D is 99. + + However, if a node does have child nodes, the metadata entries become indexes which refer to those child nodes. A metadata entry of 1 refers to the first child node, 2 to the second, + 3 to the third, and so on. The value of this node is the sum of the values of the child nodes referenced by the metadata entries. If a referenced child node does not exist, that + reference is skipped. A child node can be referenced multiple time and counts each time it is referenced. A metadata entry of 0 does not refer to any child node. + + For example, again using the above nodes: + + * Node C has one metadata entry, 2. Because node C has only one child node, 2 references a child node which does not exist, and so the value of node C is 0. + * Node A has three metadata entries: 1, 1, and 2. The 1 references node A's first child node, B, and the 2 references node A's second child node, C. Because node B has a value of 33 + and node C has a value of 0, the value of node A is 33+33+0=66. + + So, in this example, the value of the root node is 66. + + What is the value of the root node? + + Your puzzle answer was 20083. + + Both parts of this puzzle are complete! They provide two gold stars: ** + +References + + Visible links + . https://adventofcode.com/ + . https://adventofcode.com/2018/about + . https://adventofcode.com/2018/events + . https://adventofcode.com/2018/settings + . https://adventofcode.com/2018/auth/logout + . Advent of Code Supporter + https://adventofcode.com/2018/support + . https://adventofcode.com/2018 + . https://adventofcode.com/2018 + . https://adventofcode.com/2018/support + . https://adventofcode.com/2018/sponsors + . https://adventofcode.com/2018/leaderboard + . https://adventofcode.com/2018/stats + . https://adventofcode.com/2018/sponsors + . https://en.wikipedia.org/wiki/Tree_(data_structure) + . https://adventofcode.com/2018 + . https://adventofcode.com/2018/day/8/input diff --git a/2018/day08/testinput b/2018/day08/testinput new file mode 100644 index 0000000..4279f52 --- /dev/null +++ b/2018/day08/testinput @@ -0,0 +1 @@ +2 3 0 3 10 11 12 1 1 0 1 99 2 1 1 2