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141 lines
3.3 KiB
Markdown
141 lines
3.3 KiB
Markdown
---
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id: 698a1a863194f1f4e63f645f
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title: "Challenge 208: Trail Traversal"
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challengeType: 29
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dashedName: challenge-208
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---
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# --description--
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Given an array of strings representing your trail map, return a string of the moves needed to get to your goal.
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The given strings will contain the values:
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- `"C"`: Your current location
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- `"G"`: Your goal
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- `"T"`: Traversable parts of the trail
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- `"-"`: Untraversable parts of the map
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Return a string with the moves needed to follow the trail from your location to your goal where:
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- `"R"` is a move right
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- `"D"` is a move down
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- `"L"` is a move left
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- `"U"` is a move up
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- There will always be a single continuous trail, without any branching, from your current location to your goal.
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- Each trail location will have a maximum of two traversable locations touching it.
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For example, given:
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```js
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[
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"-CT--",
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"--T--",
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"--TT-",
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"---T-",
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"---G-"
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]
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```
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Return `"RDDRDD"`.
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# --hints--
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`navigate_trail(["-CT--", "--T--", "--TT-", "---T-", "---G-"])` should return `"RDDRDD"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(navigate_trail(["-CT--", "--T--", "--TT-", "---T-", "---G-"]), "RDDRDD")`)
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}})
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```
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`navigate_trail(["-----", "--TTG", "--T--", "--T--", "CTT--"])` should return `"RRUUURR"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(navigate_trail(["-----", "--TTG", "--T--", "--T--", "CTT--"]), "RRUUURR")`)
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}})
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```
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`navigate_trail(["-C----", "TT----", "T-----", "TTTTT-", "----G-"])` should return `"DLDDRRRRD"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(navigate_trail(["-C----", "TT----", "T-----", "TTTTT-", "----G-"]), "DLDDRRRRD")`)
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}})
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```
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`navigate_trail(["--------", "-CTTT---", "----T---", "---GT---", "--------"])` should return `"RRRDDL"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(navigate_trail(["--------", "-CTTT---", "----T---", "---GT---", "--------"]), "RRRDDL")`)
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}})
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```
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`navigate_trail(["TTTTTTT-", "T-----T-", "T-----T-", "TTTT--TG", "---C----"])` should return `"ULLLUUURRRRRRDDDR"`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(navigate_trail(["TTTTTTT-", "T-----T-", "T-----T-", "TTTT--TG", "---C----"]), "ULLLUUURRRRRRDDDR")`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def navigate_trail(map):
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return map
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```
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# --solutions--
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```py
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def navigate_trail(map):
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rows = len(map)
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cols = len(map[0])
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directions = [
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(0, 1, "R"),
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(1, 0, "D"),
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(0, -1, "L"),
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(-1, 0, "U"),
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]
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for r in range(rows):
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for c in range(cols):
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if map[r][c] == "C":
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row, col = r, c
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result = ""
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prev = None
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while map[row][col] != "G":
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for dr, dc, move in directions:
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new_row = row + dr
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new_col = col + dc
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if (
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0 <= new_row < rows and
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0 <= new_col < cols and
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(map[new_row][new_col] == "T" or
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map[new_row][new_col] == "G") and
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(not prev or (new_row, new_col) != prev)
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):
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result += move
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prev = (row, col)
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row, col = new_row, new_col
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break
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return result
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```
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