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83 lines
2.2 KiB
Markdown
83 lines
2.2 KiB
Markdown
---
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id: 699c8e045ee7cb94ed2322d5
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title: "Challenge 214: Domino Chain Validator"
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challengeType: 29
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dashedName: challenge-214
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---
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# --description--
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Given a 2D array representing a sequence of dominoes, determine whether it forms a valid chain.
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- Each element in the array represents a domino and will be an array of two numbers from 1 to 6, (inclusive).
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- For the chain to be valid, the second number of each domino must match the first number of the next domino.
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- The first number of the first domino and the last number of the last domino don't need to match anything.
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# --hints--
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`is_valid_domino_chain([[1, 3], [3, 6], [6, 5]])` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_valid_domino_chain([[1, 3], [3, 6], [6, 5]]), True)`)
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}})
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```
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`is_valid_domino_chain([[6, 2], [3, 4], [4, 1]])` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_valid_domino_chain([[6, 2], [3, 4], [4, 1]]), False)`)
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}})
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```
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`is_valid_domino_chain([[2, 5], [5, 6], [5, 1]])` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_valid_domino_chain([[2, 5], [5, 6], [5, 1]]), False)`)
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}})
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```
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`is_valid_domino_chain([[4, 3], [3, 1], [1, 6], [6, 6], [6, 5], [5, 1], [1, 1], [1, 4], [4, 4], [4, 2]])` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_valid_domino_chain([[4, 3], [3, 1], [1, 6], [6, 6], [6, 5], [5, 1], [1, 1], [1, 4], [4, 4], [4, 2]]), True)`)
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}})
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```
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`is_valid_domino_chain([[2, 3], [3, 3], [3, 6], [6, 1], [1, 4], [3, 5], [5, 5], [5, 4], [4, 2], [2, 2]])` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_valid_domino_chain([[2, 3], [3, 3], [3, 6], [6, 1], [1, 4], [3, 5], [5, 5], [5, 4], [4, 2], [2, 2]]), False)`)
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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 is_valid_domino_chain(dominoes):
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return dominoes
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```
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# --solutions--
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```py
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def is_valid_domino_chain(dominoes):
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for i in range(len(dominoes) - 1):
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if dominoes[i][1] != dominoes[i + 1][0]:
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return False
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return True
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```
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