2021 Day 15
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Akumatic
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2021/15/README.md
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# 2021 Day 15: Chiton
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Copyright (c) Eric Wastl
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#### [Direct Link](https://adventofcode.com/2021/day/15)
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## Part 1
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You've almost reached the exit of the cave, but the walls are getting closer together. Your submarine can barely still fit, though; the main problem is that the walls of the cave are covered in [chitons](https://en.wikipedia.org/wiki/Chiton), and it would be best not to bump any of them.
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The cavern is large, but has a very low ceiling, restricting your motion to two dimensions. The shape of the cavern resembles a square; a quick scan of chiton density produces a map of **risk level** throughout the cave (your puzzle input). For example:
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```
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1163751742
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1381373672
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2136511328
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3694931569
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7463417111
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1319128137
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1359912421
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3125421639
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1293138521
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2311944581
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```
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You start in the top left position, your destination is the bottom right position, and you cannot move diagonally. The number at each position is its **risk level**; to determine the total risk of an entire path, add up the risk levels of each position you **enter** (that is, don't count the risk level of your starting position unless you enter it; leaving it adds no risk to your total).
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Your goal is to find a path with the **lowest total risk**. In this example, a path with the lowest total risk is highlighted here:
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```
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1163751742
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1381373672
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2136511328
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3694931569
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7463417111
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||||
1319128137
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1359912421
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3125421639
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1293138521
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2311944581
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```
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The total risk of this path is **`40`** (the starting position is never entered, so its risk is not counted).
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**What is the lowest total risk of any path from the top left to the bottom right?**
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## Part 2
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Now that you know how to find low-risk paths in the cave, you can try to find your way out.
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The entire cave is actually **five times larger in both dimensions** than you thought; the area you originally scanned is just one tile in a 5x5 tile area that forms the full map. Your original map tile repeats to the right and downward; each time the tile repeats to the right or downward, all of its risk levels **are 1 higher** than the tile immediately up or left of it. However, risk levels above `9` wrap back around to `1`. So, if your original map had some position with a risk level of `8`, then that same position on each of the 25 total tiles would be as follows:
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```
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8 9 1 2 3
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9 1 2 3 4
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1 2 3 4 5
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2 3 4 5 6
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3 4 5 6 7
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```
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Each single digit above corresponds to the example position with a value of `8` on the top-left tile. Because the full map is actually five times larger in both dimensions, that position appears a total of 25 times, once in each duplicated tile, with the values shown above.
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Here is the full five-times-as-large version of the first example above, with the original map in the top left corner highlighted:
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```
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11637517422274862853338597396444961841755517295286
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13813736722492484783351359589446246169155735727126
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21365113283247622439435873354154698446526571955763
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36949315694715142671582625378269373648937148475914
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74634171118574528222968563933317967414442817852555
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13191281372421239248353234135946434524615754563572
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13599124212461123532357223464346833457545794456865
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31254216394236532741534764385264587549637569865174
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12931385212314249632342535174345364628545647573965
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23119445813422155692453326671356443778246755488935
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22748628533385973964449618417555172952866628316397
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24924847833513595894462461691557357271266846838237
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32476224394358733541546984465265719557637682166874
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47151426715826253782693736489371484759148259586125
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85745282229685639333179674144428178525553928963666
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24212392483532341359464345246157545635726865674683
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24611235323572234643468334575457944568656815567976
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42365327415347643852645875496375698651748671976285
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23142496323425351743453646285456475739656758684176
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34221556924533266713564437782467554889357866599146
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33859739644496184175551729528666283163977739427418
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35135958944624616915573572712668468382377957949348
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43587335415469844652657195576376821668748793277985
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58262537826937364893714847591482595861259361697236
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96856393331796741444281785255539289636664139174777
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35323413594643452461575456357268656746837976785794
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35722346434683345754579445686568155679767926678187
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53476438526458754963756986517486719762859782187396
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34253517434536462854564757396567586841767869795287
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45332667135644377824675548893578665991468977611257
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44961841755517295286662831639777394274188841538529
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46246169155735727126684683823779579493488168151459
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54698446526571955763768216687487932779859814388196
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69373648937148475914825958612593616972361472718347
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17967414442817852555392896366641391747775241285888
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46434524615754563572686567468379767857948187896815
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46833457545794456865681556797679266781878137789298
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64587549637569865174867197628597821873961893298417
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45364628545647573965675868417678697952878971816398
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56443778246755488935786659914689776112579188722368
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55172952866628316397773942741888415385299952649631
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57357271266846838237795794934881681514599279262561
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65719557637682166874879327798598143881961925499217
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71484759148259586125936169723614727183472583829458
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28178525553928963666413917477752412858886352396999
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57545635726865674683797678579481878968159298917926
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57944568656815567976792667818781377892989248891319
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75698651748671976285978218739618932984172914319528
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56475739656758684176786979528789718163989182927419
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67554889357866599146897761125791887223681299833479
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```
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Equipped with the full map, you can now find a path from the top left corner to the bottom right corner with the lowest total risk:
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```
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11637517422274862853338597396444961841755517295286
|
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13813736722492484783351359589446246169155735727126
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21365113283247622439435873354154698446526571955763
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36949315694715142671582625378269373648937148475914
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74634171118574528222968563933317967414442817852555
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13191281372421239248353234135946434524615754563572
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13599124212461123532357223464346833457545794456865
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31254216394236532741534764385264587549637569865174
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12931385212314249632342535174345364628545647573965
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23119445813422155692453326671356443778246755488935
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22748628533385973964449618417555172952866628316397
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24924847833513595894462461691557357271266846838237
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32476224394358733541546984465265719557637682166874
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47151426715826253782693736489371484759148259586125
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85745282229685639333179674144428178525553928963666
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24212392483532341359464345246157545635726865674683
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24611235323572234643468334575457944568656815567976
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42365327415347643852645875496375698651748671976285
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23142496323425351743453646285456475739656758684176
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34221556924533266713564437782467554889357866599146
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33859739644496184175551729528666283163977739427418
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35135958944624616915573572712668468382377957949348
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43587335415469844652657195576376821668748793277985
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58262537826937364893714847591482595861259361697236
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96856393331796741444281785255539289636664139174777
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35323413594643452461575456357268656746837976785794
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35722346434683345754579445686568155679767926678187
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53476438526458754963756986517486719762859782187396
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34253517434536462854564757396567586841767869795287
|
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45332667135644377824675548893578665991468977611257
|
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44961841755517295286662831639777394274188841538529
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46246169155735727126684683823779579493488168151459
|
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54698446526571955763768216687487932779859814388196
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69373648937148475914825958612593616972361472718347
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17967414442817852555392896366641391747775241285888
|
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46434524615754563572686567468379767857948187896815
|
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46833457545794456865681556797679266781878137789298
|
||||
64587549637569865174867197628597821873961893298417
|
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45364628545647573965675868417678697952878971816398
|
||||
56443778246755488935786659914689776112579188722368
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55172952866628316397773942741888415385299952649631
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57357271266846838237795794934881681514599279262561
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65719557637682166874879327798598143881961925499217
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71484759148259586125936169723614727183472583829458
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28178525553928963666413917477752412858886352396999
|
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57545635726865674683797678579481878968159298917926
|
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57944568656815567976792667818781377892989248891319
|
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75698651748671976285978218739618932984172914319528
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56475739656758684176786979528789718163989182927419
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67554889357866599146897761125791887223681299833479
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```
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The total risk of this path is **`315`** (the starting position is still never entered, so its risk is not counted).
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Using the full map, **what is the lowest total risk of any path from the top left to the bottom right?**
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71
2021/15/code.py
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2021/15/code.py
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# SPDX-License-Identifier: MIT
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# Copyright (c) 2021 Akumatic
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#
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# https://adventofcode.com/2021/day/15
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from queue import PriorityQueue
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def read_file(filename: str = "input.txt") -> tuple:
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with open(f"{__file__.rstrip('code.py')}{filename}", "r") as f:
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lines = [line for line in f.read().strip().split("\n")]
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data = list()
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for line in lines:
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data += [int(x) for x in line]
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return len(lines[0]), data
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def get_neighbor_idx(idx: int, dim: int) -> list:
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y = idx // dim
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x = idx - y * dim
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neighbors = [(x - 1, y), (x + 1, y), (x, y - 1), (x, y + 1)]
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return [n[0] + n[1]*dim for n in neighbors if 0 <= n[0] < dim and 0 <= n[1] < dim]
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def dijkstra(cavern: tuple) -> dict:
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dimension, graph = cavern[0], cavern[1]
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graph_size = len(graph)
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queue = PriorityQueue()
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queue.put((0, 0))
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dist = {0: 0}
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while not queue.empty():
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distance, idx = queue.get()
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for neighbor in get_neighbor_idx(idx, dimension):
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d = distance + graph[neighbor]
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if neighbor not in dist or dist[neighbor] > d:
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dist[neighbor] = d
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queue.put((d, neighbor))
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return dist
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def expand(cavern: tuple) -> tuple:
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dim = cavern[0]
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# expand to the right
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tmp = list()
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for y in range(dim):
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for i in range(5):
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for x in range(dim):
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idx = x + y * dim
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val = cavern[1][idx] + i
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if val > 9:
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val -= 9
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tmp.append(val)
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cave = tmp
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# expand to the bottom
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for _ in range(4):
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tmp = [n + 1 if n + 1 < 10 else n - 8 for n in tmp]
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cave += tmp
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return dim * 5, cave
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def part1(cavern: tuple) -> int:
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return dijkstra(cavern)[cavern[0]**2 - 1]
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def part2(cavern: tuple) -> int:
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cavern = expand(cavern)
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return dijkstra(cavern)[cavern[0]**2 - 1]
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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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100
2021/15/input.txt
Normal file
100
2021/15/input.txt
Normal file
@ -0,0 +1,100 @@
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9996597169934462866674298311585462164938429595325898982446756778926623312419928462581954959682691967
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2985473821192251974951857599267129581722193984669499111891148299417367918194777369292323577917271689
|
||||
9925747219565218292791878884867871912812888438419913951838884629861174692194127299557997716292419899
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||||
5689394257397924968615986194575967939829494536315791891189399346198354797971455482896478478991915819
|
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7191714231614914258843698935928469828947261253778874596549317179317739769211815941393178993235483164
|
||||
8261411311858625525189141927634584957969193998594589831161827486428181822492341148933916699735911951
|
||||
8491916338957614879947827918271919292115249669528752137626999289878321718995174471152853256534998862
|
||||
2878942979689932518788993693919232994181295141998674786229493444893529921396251916792869778369761577
|
||||
5324299179293789278896352999521161196335675668494898163723519189354519915572911924817148697972884595
|
||||
3249286984664762888964519927147388331192962971447998569588811898887938916912876838845226891917694396
|
||||
8384711585589932817217197266234448864986267887731451266551819546679493985489271887959192715994617118
|
||||
8558392988645926497661221561199187591614971862693418259749682995917799111375997911491314618563955283
|
||||
8448982133981186899328338219912614175929696865411141936944349293218792978158697238989149481799787693
|
||||
6829788549538172915212861761762811411999446212987957999818898769129995716668189729153281278992882961
|
||||
8171853935996999759827785274119369819474116329221912117887992386979999931924642786162346838988896998
|
||||
1611259796732365683997911728853115978724281285998878729487172937996381111893368427199788995529699915
|
||||
5688512981128461937192312761945159148391968976355979921691491771799226893997198194759896799954945399
|
||||
4677331887688119697949511996723791999294219225462628938768446491296191832983981819292814141771743713
|
||||
6998483931417251929193268819892118766128664979798963467991984184987179579514795981938448296897618517
|
||||
1319691989733199973528388427162273193372475922119779921892954934985598398886515997181951338365969481
|
||||
4299527919598836712396166784912989538495958199899819597168429291995797395512392555913678895994639498
|
||||
1959943162267357312789489261812239925964689121762221787667885625878744214497989669145322976481797489
|
||||
2395186851949597519521959999946556211159613271161993818642229693391155187199898781144194699852896652
|
||||
8995881734129869469494233213758985566876122341955919419837192269724184297999191789915397161175694514
|
||||
1589989198744781329419599199511686425468596978475911132726959429936172193239693316868625965916184839
|
||||
9882447993214964282121932219232574629549391691929133268994142998198147342636396881745981998993474912
|
||||
7737876929128219459528645811539339996618399972961981295848297621996944591699891682671676889993245341
|
||||
2158439725377317758939718768374247166592199417399889641427291896886226693898817697782973998951155297
|
||||
9887435694697319583419914934749159528953559489752368919149391989598118395465194898962938213247967394
|
||||
5517647144893878432868162191929768517614669477961621993427299179961283174693342728139917919748564391
|
||||
9779481169993213628493311246996281191589186121851592447341849279199269441668863494199994929698131648
|
||||
2959874885233989493331717181293295698768911881968258917777516222479221154718272378589492728986899898
|
||||
6336128726683932115888889787212994762911499913872419883197591582599568128238312873213867483934993736
|
||||
4159514962399649263976989199987979698821179147379581119235896886328996193984413131685592771291576266
|
||||
1593442591996141992339729558718999183319971698622191712984511552643854986614687182148724814175817656
|
||||
9792498287944398191893973114979339967886679599475949871199956319839493957942371899296491239678972934
|
||||
6958832763784733851418838934315594789797315719727432698172191667929493981747889875995275627797923389
|
||||
2912489714937795668149651893389788991785743292299526654245111715698898839692818936313581913792918926
|
||||
7195756671161364812491586641918192917591128991769216529117641729128224625938118993381221258566281874
|
||||
4919251993929919793698991748199857829677991159297389859596679221721172471911475458139992481162519175
|
||||
2254995628727981496178769799122851151827187992613599888143189293495389836799918172649522571495393365
|
||||
4919469549846964135387296992591431749927527554992629919141933995127179342887519454978599414789914783
|
||||
8249277916939616589494692899215986219117999611126787797761663947855882548552921696511335319977977276
|
||||
8997247891948158197997424577668119969512395999198777982793597792164299869129186219578886115816121295
|
||||
6941997972868952192836588639197579791529983259434179858113289553975791179662335714993722671597998927
|
||||
6694662791989839799999721874596512192467821383498167219689731819817638219918398599817984591678772498
|
||||
8858288185291451396798937151154999428339834613586898546191955738849619381719419835132493839871399615
|
||||
7529911675212868597977638119426882947159197216327972592891619718857968144833998898924864651272849995
|
||||
9691484419158964971779927177911682159384281915994991576187561796853919134899954697897563168694867221
|
||||
4894319635215192279188115698914991697424519884293976389911441262789983112191971613112113166199375431
|
||||
1511639279893277978712597619227629471932123889359895191237277184999881711199775191369185982853995942
|
||||
9915422489642151365815679799243528945862628419597469996679371174699116156719192447889887994175395158
|
||||
1269519797393822199696946291999871185118994883519698996879178838176969819961121912895184999235939982
|
||||
8998169189895585969989213678844886699295797199711994499817992161989593968875298663522818358585897162
|
||||
7927682215931182986837324955117927481866962848794911121399817493187817199924163786732968396717889912
|
||||
8311863849984418139391492994599723197997936818681266467612993599437842931897692691123198157196313828
|
||||
3912811962539933372757862888979829436791914818558936298392631514184279598868598428219711472666991639
|
||||
6916684642174849949229678714798199182288419234936896995119656411631851528789981973983524139588322938
|
||||
3899591899121528899189971692387979612889537681737837516481351153864963849151779816549651236111723594
|
||||
3733748925586297882817174179168829219857222829879737341141839283411189725169226158941341846729768669
|
||||
9789499627896993539271958577799419338952872815148576127561639829528596519399349651538276989994528487
|
||||
7388981178985997387282499451819991165879682469882199551165119298566527989112579262966861989646115399
|
||||
5991942761492919732325149912387694118188713956668248812874198274888581191798982696129299728788152392
|
||||
4893929462916669917284961278939751989925132199496199189137998549751266279931261714899988486719869185
|
||||
4997993581899573559368431987787949249487616996236465166438295477511852952993911916999513819315563739
|
||||
5694962633999723232519196778886841863659775543315314187999819975671489384312111125194191191689318842
|
||||
8117917171397291331189259254585716591711966747299169269591559696147192299722924212179199479985927778
|
||||
5877195869199369738399992996992351916954198321916324999535799172491147977863276571643974197933991225
|
||||
9989937132116396991282665553786386787251927628645189196271484472765767798223882649693739891271941718
|
||||
9881817923976739289587441977932118769978916716257286976119129982935796939299745998797611525399338946
|
||||
7971721113779639519693896636532198958154533493955284625816918678591158938299299514956545289189225246
|
||||
1934255841143924219963318212532349185169864629346812611498281935883975296729898789599295275471239935
|
||||
9389259195122479459673587535287714317984291529979184993896171591567899939324815119172791936569419171
|
||||
1219545154899922238148139999125192284119454489112162247977417126936591683779289118922958941952169529
|
||||
8931326645155712193944977992128197782593896232969361888983783158482969662613471498363997158128983917
|
||||
9391814334978943893899898719238927345819158859742137386199831611671627868629743974529895867689722899
|
||||
8899661813588998957926823145981293975684977898749619148875149895569991796276683223974512522996784281
|
||||
8189997341861632296117873952976155948326181517876925234797513284989779614111171824983144719982838692
|
||||
6829974748888281152995139169943951978697714989859236979688489367767193968499469271347883923978496486
|
||||
3582825929871712773829442944988717183399644827597944269949291896788936218399384642479246326487212216
|
||||
1281849189867928125128247997991274988592254197114976969923792926319271988297834927369539637996142862
|
||||
6975385386529147231116538827916688428583685119999922155687868872191934969189912616939972416699937619
|
||||
9142581394887759489992391495154883364165399163526193468348698682816285172516792933881369365183699737
|
||||
3411779799639918597997735278279522191199866497528592736267813281569999199119412823772227677998946384
|
||||
2116411967515514942119364428959419118117956378157649922119835139438587436793347611988988395844999146
|
||||
4969594274619966968618996995355173423281217195299985411254849697474491117942266985699122594883385615
|
||||
4917299221629599799699849452938637368998116959389958177198157236988184989389719268887182197869999794
|
||||
9933199734925928814814699974319532158151925514912941886226193291877951342254648694293572133944495113
|
||||
9987885196669594244937469588999294967538347679792413734999119397189999758851998539321185392791823319
|
||||
6989985129833911782351863869583492932291897395825982916227178892928481149185294531999169898771899993
|
||||
8181799944142196786791987474137119471971711249456315997994855914169196337574821618642899989499999967
|
||||
9977674398586181511429839918697885836894979877115969228276796238492289811696176629546719787979932155
|
||||
9649322578254321813692488189287617696897892613327148796662618417432796649759345844497523367451481152
|
||||
5129599141866519189896719299898197851393894869211189289921289673533589213789998748469233769479419838
|
||||
1914167773815939689484489593599191199453921623428226899327789139828531391877739791958192158441984193
|
||||
8338474519167599455272191263393519999999117471971142469799444885161861196178994691697689794932649387
|
||||
1559148889238879814969113114369991178858114182289991437257816149529871139727898999977787479892611941
|
||||
2195956622389911468295917219887214665812887892199883687933786497999277478287123418492269694943326749
|
||||
9812749311865999362692593879136236263719259266549637913645675293968172469772769845996496649211944289
|
||||
2292883723888976611993688774892793962329432919349328271848881342422189315889383193139146839498568176
|
||||
2
2021/15/solution.txt
Normal file
2
2021/15/solution.txt
Normal file
@ -0,0 +1,2 @@
|
||||
Part 1: 604
|
||||
Part 2: 2907
|
||||
16
2021/15/test_code.py
Normal file
16
2021/15/test_code.py
Normal file
@ -0,0 +1,16 @@
|
||||
# SPDX-License-Identifier: MIT
|
||||
# Copyright (c) 2021 Akumatic
|
||||
|
||||
from code import part1, part2, read_file, expand
|
||||
|
||||
def test():
|
||||
vals = read_file("test_input_1.txt")
|
||||
assert part1(vals) == 40
|
||||
print("Passed Part 1")
|
||||
assert expand(vals) == read_file("test_input_2.txt")
|
||||
print("Passed expansion")
|
||||
assert part2(vals) == 315
|
||||
print("Passed Part 2")
|
||||
|
||||
if __name__ == "__main__":
|
||||
test()
|
||||
10
2021/15/test_input_1.txt
Normal file
10
2021/15/test_input_1.txt
Normal file
@ -0,0 +1,10 @@
|
||||
1163751742
|
||||
1381373672
|
||||
2136511328
|
||||
3694931569
|
||||
7463417111
|
||||
1319128137
|
||||
1359912421
|
||||
3125421639
|
||||
1293138521
|
||||
2311944581
|
||||
50
2021/15/test_input_2.txt
Normal file
50
2021/15/test_input_2.txt
Normal file
@ -0,0 +1,50 @@
|
||||
11637517422274862853338597396444961841755517295286
|
||||
13813736722492484783351359589446246169155735727126
|
||||
21365113283247622439435873354154698446526571955763
|
||||
36949315694715142671582625378269373648937148475914
|
||||
74634171118574528222968563933317967414442817852555
|
||||
13191281372421239248353234135946434524615754563572
|
||||
13599124212461123532357223464346833457545794456865
|
||||
31254216394236532741534764385264587549637569865174
|
||||
12931385212314249632342535174345364628545647573965
|
||||
23119445813422155692453326671356443778246755488935
|
||||
22748628533385973964449618417555172952866628316397
|
||||
24924847833513595894462461691557357271266846838237
|
||||
32476224394358733541546984465265719557637682166874
|
||||
47151426715826253782693736489371484759148259586125
|
||||
85745282229685639333179674144428178525553928963666
|
||||
24212392483532341359464345246157545635726865674683
|
||||
24611235323572234643468334575457944568656815567976
|
||||
42365327415347643852645875496375698651748671976285
|
||||
23142496323425351743453646285456475739656758684176
|
||||
34221556924533266713564437782467554889357866599146
|
||||
33859739644496184175551729528666283163977739427418
|
||||
35135958944624616915573572712668468382377957949348
|
||||
43587335415469844652657195576376821668748793277985
|
||||
58262537826937364893714847591482595861259361697236
|
||||
96856393331796741444281785255539289636664139174777
|
||||
35323413594643452461575456357268656746837976785794
|
||||
35722346434683345754579445686568155679767926678187
|
||||
53476438526458754963756986517486719762859782187396
|
||||
34253517434536462854564757396567586841767869795287
|
||||
45332667135644377824675548893578665991468977611257
|
||||
44961841755517295286662831639777394274188841538529
|
||||
46246169155735727126684683823779579493488168151459
|
||||
54698446526571955763768216687487932779859814388196
|
||||
69373648937148475914825958612593616972361472718347
|
||||
17967414442817852555392896366641391747775241285888
|
||||
46434524615754563572686567468379767857948187896815
|
||||
46833457545794456865681556797679266781878137789298
|
||||
64587549637569865174867197628597821873961893298417
|
||||
45364628545647573965675868417678697952878971816398
|
||||
56443778246755488935786659914689776112579188722368
|
||||
55172952866628316397773942741888415385299952649631
|
||||
57357271266846838237795794934881681514599279262561
|
||||
65719557637682166874879327798598143881961925499217
|
||||
71484759148259586125936169723614727183472583829458
|
||||
28178525553928963666413917477752412858886352396999
|
||||
57545635726865674683797678579481878968159298917926
|
||||
57944568656815567976792667818781377892989248891319
|
||||
75698651748671976285978218739618932984172914319528
|
||||
56475739656758684176786979528789718163989182927419
|
||||
67554889357866599146897761125791887223681299833479
|
||||
@ -29,7 +29,7 @@ Collect stars by solving puzzles. Two puzzles will be made available on each day
|
||||
| 12 | :white_check_mark: | :white_check_mark: | [Solution](12/code.py) | [Day 12](https://adventofcode.com/2021/day/12) |
|
||||
| 13 | :white_check_mark: | :white_check_mark: | [Solution](13/code.py) | [Day 13](https://adventofcode.com/2021/day/13) |
|
||||
| 14 | :white_check_mark: | :white_check_mark: | [Solution](14/code.py) | [Day 14](https://adventofcode.com/2021/day/14) |
|
||||
| 15 | | | | |
|
||||
| 15 | :white_check_mark: | :white_check_mark: | [Solution](15/code.py) | [Day 15](https://adventofcode.com/2021/day/15) |
|
||||
| 16 | | | | |
|
||||
| 17 | | | | |
|
||||
| 18 | | | | |
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user