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108 lines
2.7 KiB
Markdown
108 lines
2.7 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: 28
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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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`findLeftHandedSeats([["U", "R", "U", "L"], ["U", "R", "R", "R"]])` should return `2`.
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```js
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assert.equal(findLeftHandedSeats([["U", "R", "U", "L"], ["U", "R", "R", "R"]]), 2);
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```
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`findLeftHandedSeats([["U", "U", "U", "U"], ["U", "U", "U", "U"]])` should return `8`.
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```js
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assert.equal(findLeftHandedSeats([["U", "U", "U", "U"], ["U", "U", "U", "U"]]), 8);
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```
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`findLeftHandedSeats([["U", "R", "U", "R"], ["L", "R", "R", "U"]])` should return `0`.
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```js
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assert.equal(findLeftHandedSeats([["U", "R", "U", "R"], ["L", "R", "R", "U"]]), 0);
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```
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`findLeftHandedSeats([["L", "U", "R", "R"], ["L", "U", "R", "R"]])` should return `1`.
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```js
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assert.equal(findLeftHandedSeats([["L", "U", "R", "R"], ["L", "U", "R", "R"]]), 1);
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```
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`findLeftHandedSeats([["U", "R", "U", "U"], ["U", "U", "L", "U"]])` should return `5`.
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```js
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assert.equal(findLeftHandedSeats([["U", "R", "U", "U"], ["U", "U", "L", "U"]]), 5);
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```
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# --seed--
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## --seed-contents--
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```js
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function findLeftHandedSeats(table) {
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return table;
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}
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```
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# --solutions--
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```js
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function findLeftHandedSeats(table) {
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let availableSeats = 0;
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const [topRow, bottomRow] = table;
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for (let i=0; i<topRow.length; i++) {
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if (topRow[i] === 'U') {
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if (i === 3) {
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availableSeats++;
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} else if (topRow[i+1] !== 'R') {
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availableSeats++;
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}
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}
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}
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for (let i=0; i<bottomRow.length; i++) {
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if (bottomRow[i] === 'U') {
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if (i === 0) {
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availableSeats++;
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} else if (bottomRow[i-1] !== 'R') {
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availableSeats++;
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}
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}
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}
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return availableSeats;
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}
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```
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