2022 Day 08
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Akumatic
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2022/08/README.md
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# 2022 Day 08: Treetop Tree House
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Copyright (c) Eric Wastl
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#### [Direct Link](https://adventofcode.com/2022/day/8)
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## Part 1
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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](https://en.wikipedia.org/wiki/Tree_house).
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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.
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The Elves have already launched a [quadcopter](https://en.wikipedia.org/wiki/Quadcopter) to generate a map with the height of each tree (your puzzle input). For example:
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```
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30373
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25512
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65332
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33549
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35390
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```
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Each tree is represented as a single digit whose value is its height, where `0` is the shortest and `9` is the tallest.
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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.
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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:
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- 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.)
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- The top-middle `5` is **visible** from the top and right.
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- 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.
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- The left-middle `5` is **visible**, but only from the right.
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- 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.
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- The right-middle `3` is **visible** from the right.
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- In the bottom row, the middle `5` is **visible**, but the `3` and `4` are not.
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With 16 trees visible on the edge and another 5 visible in the interior, a total of **`21`** trees are visible in this arrangement.
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Consider your map; **how many trees are visible from outside the grid?**
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## Part 2
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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**.
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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.)
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The Elves don't care about distant trees taller than those found by the rules above; the proposed tree house has large [eaves](https://en.wikipedia.org/wiki/Eaves) to keep it dry, so they wouldn't be able to see higher than the tree house anyway.
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In the example above, consider the middle `5` in the second row:
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```
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30373
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25512
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65332
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33549
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35390
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```
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- Looking up, its view is not blocked; it can see **`1`** tree (of height `3`).
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- Looking left, its view is blocked immediately; it can see only **`1`** tree (of height `5`, right next to it).
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- Looking right, its view is not blocked; it can see **`2`** trees.
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- 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).
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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`).
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However, you can do even better: consider the tree of height `5` in the middle of the fourth row:
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```
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30373
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25512
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||||
65332
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||||
33549
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||||
35390
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```
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- Looking up, its view is blocked at **`2`** trees (by another tree with a height of `5`).
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- Looking left, its view is not blocked; it can see **`2`** trees.
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- Looking down, its view is also not blocked; it can see **`1`** tree.
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- Looking right, its view is blocked at **`2`** trees (by a massive tree of height `9`).
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This tree's scenic score is **`8`** (`2 * 2 * 1 * 2`); this is the ideal spot for the tree house.
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Consider each tree on your map. **What is the highest scenic score possible for any tree?**
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41
2022/08/code.py
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2022/08/code.py
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# SPDX-License-Identifier: MIT
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# Copyright (c) 2022 Akumatic
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#
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# https://adventofcode.com/2022/day/8
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def read_file(filename: str = "input.txt") -> list:
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with open(f"{__file__.rstrip('code.py')}{filename}", "r") as f:
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lines = [[int(x) for x in line.strip()] for line in f.readlines()]
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return lines
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def calculate_scenic_score(field: list, i: int, j: int) -> int:
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dirs = {"u": (0, -1), "d": (0, 1), "l": (1, 0), "r": (-1, 0)}
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count = {"u": 0, "d": 0, "l": 0, "r": 0}
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for dir, val in dirs.items():
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x, y = i, j
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while x + val[0] >= 0 and x + val[0] < len(field[0]) and \
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y + val[1] >= 0 and y + val[1] < len(field):
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x += val[0]
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y += val[1]
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count[dir] += 1
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if field[y][x] >= field[j][i]:
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break
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return count["u"] * count["d"] * count["l"] * count["r"]
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def part1(vals: list) -> int:
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return sum([any((
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not any(vals[j][x] >= vals[j][i] for x in range(0, i)), # left
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not any(vals[j][x] >= vals[j][i] for x in range(i+1, len(vals[0]))), # right
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not any(vals[y][i] >= vals[j][i] for y in range(0, j)), # down
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not any(vals[y][i] >= vals[j][i] for y in range(j+1, len(vals))) # up
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)) for j in range(len(vals)) for i in range(len(vals[0]))])
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def part2(vals: list) -> int:
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scenic_scores = [calculate_scenic_score(vals, i, j) for
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j in range(len(vals)) for i in range(len(vals[0]))]
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return max(scenic_scores)
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if __name__ == "__main__":
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vals = read_file()
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print(f"Part 1: {part1(vals)}")
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print(f"Part 2: {part2(vals)}")
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99
2022/08/input.txt
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2022/08/input.txt
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|
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||||
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||||
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||||
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|
||||
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|
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|
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414462311300441254474772486749467753538794788465984797676648668849664495546568855562445764261642010
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
332330330010343221124140132242255256316545654313060323031636355342510224333220335454325432312040232
|
||||
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|
||||
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|
||||
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|
||||
110302001002203213045154432555553533654213115630566633251401333456110344545402251530041323224011221
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2
2022/08/solution.txt
Normal file
2
2022/08/solution.txt
Normal file
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Part 1: 1695
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Part 2: 287040
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16
2022/08/test_code.py
Normal file
16
2022/08/test_code.py
Normal file
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# SPDX-License-Identifier: MIT
|
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# Copyright (c) 2022 Akumatic
|
||||
|
||||
from code import read_file, part1, part2, calculate_scenic_score
|
||||
|
||||
def test():
|
||||
vals = read_file("test_input.txt")
|
||||
assert part1(vals) == 21
|
||||
print("Passed Part 1")
|
||||
assert calculate_scenic_score(vals, 2, 1) == 4
|
||||
assert calculate_scenic_score(vals, 2, 3) == 8
|
||||
assert part2(vals) == 8
|
||||
print("Passed Part 2")
|
||||
|
||||
if __name__ == "__main__":
|
||||
test()
|
||||
5
2022/08/test_input.txt
Normal file
5
2022/08/test_input.txt
Normal file
@ -0,0 +1,5 @@
|
||||
30373
|
||||
25512
|
||||
65332
|
||||
33549
|
||||
35390
|
||||
@ -22,7 +22,7 @@ Collect stars by solving puzzles. Two puzzles will be made available on each day
|
||||
| 05 | :white_check_mark: | :white_check_mark: | [Solution](05/code.py) | [Day 05](https://adventofcode.com/2022/day/5) |
|
||||
| 06 | :white_check_mark: | :white_check_mark: | [Solution](06/code.py) | [Day 06](https://adventofcode.com/2022/day/6) |
|
||||
| 07 | :white_check_mark: | :white_check_mark: | [Solution](07/code.py) | [Day 07](https://adventofcode.com/2022/day/7) |
|
||||
| 08 | | | | [Day 08](https://adventofcode.com/2022/day/8) |
|
||||
| 08 | :white_check_mark: | :white_check_mark: | [Solution](08/code.py) | [Day 08](https://adventofcode.com/2022/day/8) |
|
||||
| 09 | | | | [Day 09](https://adventofcode.com/2022/day/9) |
|
||||
| 10 | | | | [Day 10](https://adventofcode.com/2022/day/10) |
|
||||
| 11 | | | | [Day 11](https://adventofcode.com/2022/day/11) |
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user