2022 Day 08 Complete!
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169
2022/day08/main.go
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2022/day08/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.StdinToCoordMap()
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part1(inp)
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fmt.Println("")
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part2(inp)
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}
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func part1(inp h.CoordByteMap) {
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var count int
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for x := inp.TLX; x <= inp.BRX; x++ {
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for y := inp.TLY; y <= inp.BRY; y++ {
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tree := h.Coordinate{X: x, Y: y}
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if treeIsVisibleFromOutside(inp, tree) {
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count++
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}
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}
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}
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fmt.Println("# Part 1")
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fmt.Println("Visible tree from the outside:", count)
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}
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func part2(inp h.CoordByteMap) {
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var bestScore int
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var bestTree h.Coordinate
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for x := inp.TLX; x <= inp.BRX; x++ {
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for y := inp.TLY; y <= inp.BRY; y++ {
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tree := h.Coordinate{X: x, Y: y}
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ss := scenicScore(inp, tree)
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if ss > bestScore {
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bestScore = ss
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bestTree = tree
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}
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}
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}
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fmt.Println("# Part 2")
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fmt.Println("Best Score:", bestScore, "@", bestTree)
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}
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func treeIsVisibleFromOutside(inp h.CoordByteMap, pos h.Coordinate) bool {
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if pos.X == inp.TLX || pos.X == inp.BRX || pos.Y == inp.TLY || pos.Y == inp.BRY {
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return true
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}
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treeHeight := inp.Get(pos)
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n, e, s, w := true, true, true, true
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// Check North
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for y := inp.TLY; y < pos.Y; y++ {
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if inp.Get(h.Coordinate{X: pos.X, Y: y}) >= treeHeight {
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n = false
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break
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}
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}
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if n {
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return true
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}
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// Check East
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for x := inp.BRX; x > pos.X; x-- {
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if inp.Get(h.Coordinate{X: x, Y: pos.Y}) >= treeHeight {
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e = false
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break
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}
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}
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if e {
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return true
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}
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// Check South
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for y := inp.BRY; y > pos.Y; y-- {
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if inp.Get(h.Coordinate{X: pos.X, Y: y}) >= treeHeight {
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s = false
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break
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}
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}
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if s {
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return true
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}
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// Check West
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for x := inp.TLX; x < pos.X; x++ {
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if inp.Get(h.Coordinate{X: x, Y: pos.Y}) >= treeHeight {
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w = false
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break
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}
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}
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if w {
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return true
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}
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return false
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}
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func scenicScore(inp h.CoordByteMap, pos h.Coordinate) int {
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var n, e, s, w int
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treeHeight := inp.Get(pos)
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// Find how many trees we can see to the North
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if pos.Y == inp.TLY {
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return 0
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} else {
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for y := pos.Y - 1; y >= inp.TLY; y-- {
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tst := inp.Get(h.Coordinate{X: pos.X, Y: y})
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if tst < treeHeight {
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n++
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} else if tst >= treeHeight {
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n++
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break
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}
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}
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if n == 0 {
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return 0
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}
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}
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// Find how many trees we can see to the East
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if pos.X == inp.BRX {
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return 0
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} else {
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for x := pos.X + 1; x <= inp.BRX; x++ {
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tst := inp.Get(h.Coordinate{X: x, Y: pos.Y})
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if tst < treeHeight {
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e++
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} else if tst >= treeHeight {
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e++
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break
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}
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}
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if e == 0 {
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return 0
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||||||
|
}
|
||||||
|
}
|
||||||
|
// Find how many trees we can see to the South
|
||||||
|
if pos.Y == inp.BRY {
|
||||||
|
return 0
|
||||||
|
} else {
|
||||||
|
for y := pos.Y + 1; y <= inp.BRY; y++ {
|
||||||
|
tst := inp.Get(h.Coordinate{X: pos.X, Y: y})
|
||||||
|
if tst < treeHeight {
|
||||||
|
s++
|
||||||
|
} else if tst >= treeHeight {
|
||||||
|
s++
|
||||||
|
break
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if s == 0 {
|
||||||
|
return 0
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Find how many trees we can see to the West
|
||||||
|
if pos.X == inp.TLX {
|
||||||
|
return 0
|
||||||
|
} else {
|
||||||
|
for x := pos.X - 1; x >= inp.TLX; x-- {
|
||||||
|
tst := inp.Get(h.Coordinate{X: x, Y: pos.Y})
|
||||||
|
if tst < treeHeight {
|
||||||
|
w++
|
||||||
|
} else if tst >= treeHeight {
|
||||||
|
w++
|
||||||
|
break
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if w == 0 {
|
||||||
|
return 0
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return n * e * s * w
|
||||||
|
}
|
||||||
155
2022/day08/problem
Normal file
155
2022/day08/problem
Normal file
@ -0,0 +1,155 @@
|
|||||||
|
Advent of Code
|
||||||
|
|
||||||
|
• [About]
|
||||||
|
• [Events]
|
||||||
|
• [Shop]
|
||||||
|
• [Settings]
|
||||||
|
• [Log Out]
|
||||||
|
|
||||||
|
br0xen (AoC++) 16*
|
||||||
|
|
||||||
|
{year=>2022}
|
||||||
|
|
||||||
|
• [Calendar]
|
||||||
|
• [AoC++]
|
||||||
|
• [Sponsors]
|
||||||
|
• [Leaderboard]
|
||||||
|
• [Stats]
|
||||||
|
|
||||||
|
Our sponsors help make Advent of Code possible:
|
||||||
|
Ansys - Take a leap of certainty in your career, code for Ansys!
|
||||||
|
|
||||||
|
--- Day 8: Treetop Tree House ---
|
||||||
|
|
||||||
|
The expedition comes across a peculiar patch of tall trees all planted carefully in a
|
||||||
|
grid. The Elves explain that a previous expedition planted these trees as a reforestation
|
||||||
|
effort. Now, they're curious if this would be a good location for a tree house.
|
||||||
|
|
||||||
|
First, determine whether there is enough tree cover here to keep a tree house hidden. To
|
||||||
|
do this, you need to count the number of trees that are visible from outside the grid
|
||||||
|
when looking directly along a row or column.
|
||||||
|
|
||||||
|
The Elves have already launched a quadcopter to generate a map with the height of each
|
||||||
|
tree (your puzzle input). For example:
|
||||||
|
|
||||||
|
30373
|
||||||
|
25512
|
||||||
|
65332
|
||||||
|
33549
|
||||||
|
35390
|
||||||
|
|
||||||
|
Each tree is represented as a single digit whose value is its height, where 0 is the
|
||||||
|
shortest and 9 is the tallest.
|
||||||
|
|
||||||
|
A tree is visible if all of the other trees between it and an edge of the grid are
|
||||||
|
shorter than it. Only consider trees in the same row or column; that is, only look up,
|
||||||
|
down, left, or right from any given tree.
|
||||||
|
|
||||||
|
All of the trees around the edge of the grid are visible - since they are already on the
|
||||||
|
edge, there are no trees to block the view. In this example, that only leaves the
|
||||||
|
interior nine trees to consider:
|
||||||
|
|
||||||
|
• The top-left 5 is visible from the left and top. (It isn't visible from the right or
|
||||||
|
bottom since other trees of height 5 are in the way.)
|
||||||
|
• The top-middle 5 is visible from the top and right.
|
||||||
|
• The top-right 1 is not visible from any direction; for it to be visible, there would
|
||||||
|
need to only be trees of height 0 between it and an edge.
|
||||||
|
• The left-middle 5 is visible, but only from the right.
|
||||||
|
• The center 3 is not visible from any direction; for it to be visible, there would
|
||||||
|
need to be only trees of at most height 2 between it and an edge.
|
||||||
|
• The right-middle 3 is visible from the right.
|
||||||
|
• In the bottom row, the middle 5 is visible, but the 3 and 4 are not.
|
||||||
|
|
||||||
|
With 16 trees visible on the edge and another 5 visible in the interior, a total of 21
|
||||||
|
trees are visible in this arrangement.
|
||||||
|
|
||||||
|
Consider your map; how many trees are visible from outside the grid?
|
||||||
|
|
||||||
|
Your puzzle answer was 1693.
|
||||||
|
|
||||||
|
--- Part Two ---
|
||||||
|
|
||||||
|
Content with the amount of tree cover available, the Elves just need to know the best
|
||||||
|
spot to build their tree house: they would like to be able to see a lot of trees.
|
||||||
|
|
||||||
|
To measure the viewing distance from a given tree, look up, down, left, and right from
|
||||||
|
that tree; stop if you reach an edge or at the first tree that is the same height or
|
||||||
|
taller than the tree under consideration. (If a tree is right on the edge, at least one
|
||||||
|
of its viewing distances will be zero.)
|
||||||
|
|
||||||
|
The Elves don't care about distant trees taller than those found by the rules above; the
|
||||||
|
proposed tree house has large eaves to keep it dry, so they wouldn't be able to see
|
||||||
|
higher than the tree house anyway.
|
||||||
|
|
||||||
|
In the example above, consider the middle 5 in the second row:
|
||||||
|
|
||||||
|
30373
|
||||||
|
25512
|
||||||
|
65332
|
||||||
|
33549
|
||||||
|
35390
|
||||||
|
|
||||||
|
• Looking up, its view is not blocked; it can see 1 tree (of height 3).
|
||||||
|
• Looking left, its view is blocked immediately; it can see only 1 tree (of height 5,
|
||||||
|
right next to it).
|
||||||
|
• Looking right, its view is not blocked; it can see 2 trees.
|
||||||
|
• Looking down, its view is blocked eventually; it can see 2 trees (one of height 3,
|
||||||
|
then the tree of height 5 that blocks its view).
|
||||||
|
|
||||||
|
A tree's scenic score is found by multiplying together its viewing distance in each of
|
||||||
|
the four directions. For this tree, this is 4 (found by multiplying 1 * 1 * 2 * 2).
|
||||||
|
|
||||||
|
However, you can do even better: consider the tree of height 5 in the middle of the
|
||||||
|
fourth row:
|
||||||
|
|
||||||
|
30373
|
||||||
|
25512
|
||||||
|
65332
|
||||||
|
33549
|
||||||
|
35390
|
||||||
|
|
||||||
|
• Looking up, its view is blocked at 2 trees (by another tree with a height of 5).
|
||||||
|
• Looking left, its view is not blocked; it can see 2 trees.
|
||||||
|
• Looking down, its view is also not blocked; it can see 1 tree.
|
||||||
|
• Looking right, its view is blocked at 2 trees (by a massive tree of height 9).
|
||||||
|
|
||||||
|
This tree's scenic score is 8 (2 * 2 * 1 * 2); this is the ideal spot for the tree house.
|
||||||
|
|
||||||
|
Consider each tree on your map. What is the highest scenic score possible for any tree?
|
||||||
|
|
||||||
|
Your puzzle answer was 422059.
|
||||||
|
|
||||||
|
Both parts of this puzzle are complete! They provide two gold stars: **
|
||||||
|
|
||||||
|
At this point, you should return to your Advent calendar and try another puzzle.
|
||||||
|
|
||||||
|
If you still want to see it, you can get your puzzle input.
|
||||||
|
|
||||||
|
You can also [Shareon Twitter Mastodon] this puzzle.
|
||||||
|
|
||||||
|
References
|
||||||
|
|
||||||
|
Visible links
|
||||||
|
. https://adventofcode.com/
|
||||||
|
. https://adventofcode.com/2022/about
|
||||||
|
. https://adventofcode.com/2022/events
|
||||||
|
. https://teespring.com/stores/advent-of-code
|
||||||
|
. https://adventofcode.com/2022/settings
|
||||||
|
. https://adventofcode.com/2022/auth/logout
|
||||||
|
. Advent of Code Supporter
|
||||||
|
https://adventofcode.com/2022/support
|
||||||
|
. https://adventofcode.com/2022
|
||||||
|
. https://adventofcode.com/2022
|
||||||
|
. https://adventofcode.com/2022/support
|
||||||
|
. https://adventofcode.com/2022/sponsors
|
||||||
|
. https://adventofcode.com/2022/leaderboard
|
||||||
|
. https://adventofcode.com/2022/stats
|
||||||
|
. https://adventofcode.com/2022/sponsors
|
||||||
|
. https://www.ansys.com/careers
|
||||||
|
. https://en.wikipedia.org/wiki/Tree_house
|
||||||
|
. https://en.wikipedia.org/wiki/Quadcopter
|
||||||
|
. https://en.wikipedia.org/wiki/Eaves
|
||||||
|
. https://adventofcode.com/2022
|
||||||
|
. https://adventofcode.com/2022/day/8/input
|
||||||
|
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Treetop+Tree+House%22+%2D+Day+8+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F8&related=ericwastl&hashtags=AdventOfCode
|
||||||
|
. javascript:void(0);
|
||||||
5
2022/day08/testinput
Normal file
5
2022/day08/testinput
Normal file
@ -0,0 +1,5 @@
|
|||||||
|
30373
|
||||||
|
25512
|
||||||
|
65332
|
||||||
|
33549
|
||||||
|
35390
|
||||||
Loading…
Reference in New Issue
Block a user