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114 lines
3.1 KiB
Markdown
114 lines
3.1 KiB
Markdown
---
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id: 69306364df283fcaff2e1ad7
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title: "Challenge 146: Left-Handed Seat at the Table"
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challengeType: 29
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dashedName: challenge-146
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---
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# --description--
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Given a 4x2 matrix (array of arrays) representing the seating arrangement for a meal, determine how many seats a left-handed person can sit at.
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- A left-handed person cannot sit where a right-handed person would be in the seat to the immediate left of them.
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In the given matrix:
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- An `"R"` is a seat occupied by a right-handed person.
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- An `"L"` is a seat occupied by a left-handed person.
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- A `"U"` is an unoccupied seat.
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- Only unoccupied seats are available to sit at.
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- The seats in the top row are facing "down", and the seats in the bottom row are facing "up" (like a table), so left and right are relative to the seat's orientation.
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- Corner seats only have one seat next to them.
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For example, in the given matrix:
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```json
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[
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["U", "R", "U", "L"],
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["U", "R", "R", "R"]
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]
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```
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The top-left seat is cannot be sat in because there's a right-handed person to the left. The other two open seats can be sat in because there isn't a right-handed person to the left.
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# --hints--
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`find_left_handed_seats([["U", "R", "U", "L"], ["U", "R", "R", "R"]])` should return `2`.
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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(find_left_handed_seats([["U", "R", "U", "L"], ["U", "R", "R", "R"]]), 2)`)
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}})
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```
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`find_left_handed_seats([["U", "U", "U", "U"], ["U", "U", "U", "U"]])` should return `8`.
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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(find_left_handed_seats([["U", "U", "U", "U"], ["U", "U", "U", "U"]]), 8)`)
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}})
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```
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`find_left_handed_seats([["U", "R", "U", "R"], ["L", "R", "R", "U"]])` should return `0`.
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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(find_left_handed_seats([["U", "R", "U", "R"], ["L", "R", "R", "U"]]), 0)`)
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}})
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```
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`find_left_handed_seats([["L", "U", "R", "R"], ["L", "U", "R", "R"]])` should return `1`.
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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(find_left_handed_seats([["L", "U", "R", "R"], ["L", "U", "R", "R"]]), 1)`)
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}})
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```
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`find_left_handed_seats([["U", "R", "U", "U"], ["U", "U", "L", "U"]])` should return `5`.
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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(find_left_handed_seats([["U", "R", "U", "U"], ["U", "U", "L", "U"]]), 5)`)
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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 find_left_handed_seats(table):
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return table
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```
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# --solutions--
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```py
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def find_left_handed_seats(table):
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available_seats = 0
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top_row, bottom_row = table
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for i in range(len(top_row)):
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if top_row[i] == "U":
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if i == len(top_row) - 1:
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available_seats += 1
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elif top_row[i + 1] != "R":
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available_seats += 1
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for i in range(len(bottom_row)):
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if bottom_row[i] == "U":
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if i == 0:
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available_seats += 1
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elif bottom_row[i - 1] != "R":
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available_seats += 1
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return available_seats
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```
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