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97 lines
2.8 KiB
Markdown
97 lines
2.8 KiB
Markdown
---
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id: 699c8e045ee7cb94ed2322dc
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title: "Challenge 221: Inverted Matrix"
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challengeType: 29
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dashedName: challenge-221
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---
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# --description--
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Given a matrix (an array of arrays) filled with two distinct values, return a new matrix where all occurrences of one value are swapped with the other.
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For example, given:
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```js
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[
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["a", "b"],
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["a", "a"]
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]
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```
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Return:
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```js
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[
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["b", "a"],
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["b", "b"]
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]
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```
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# --hints--
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`invert_matrix([["a", "b"], ["a", "a"]])` should return `[["b", "a"], ["b", "b"]]`.
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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(invert_matrix([["a", "b"], ["a", "a"]]), [["b", "a"], ["b", "b"]])`)
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}})
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```
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`invert_matrix([[1, 0, 1], [1, 1, 1], [0, 1, 0]])` should return `[[0, 1, 0], [0, 0, 0], [1, 0, 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(invert_matrix([[1, 0, 1], [1, 1, 1], [0, 1, 0]]), [[0, 1, 0], [0, 0, 0], [1, 0, 1]])`)
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}})
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```
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`invert_matrix([["apple", "banana", "banana", "apple"], ["banana", "apple", "apple", "banana"], ["banana", "banana", "banana", "apple"]])` should return `[["banana", "apple", "apple", "banana"], ["apple", "banana", "banana", "apple"], ["apple", "apple", "apple", "banana"]]`.
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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(invert_matrix([["apple", "banana", "banana", "apple"], ["banana", "apple", "apple", "banana"], ["banana", "banana", "banana", "apple"]]), [["banana", "apple", "apple", "banana"], ["apple", "banana", "banana", "apple"], ["apple", "apple", "apple", "banana"]])`)
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}})
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```
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`invert_matrix([[6, 7, 7, 7, 6], [7, 6, 7, 6, 7], [7, 7, 6, 7, 7], [7, 6, 7, 6, 7], [6, 7, 7, 7, 6]])` should return `[[7, 6, 6, 6, 7], [6, 7, 6, 7, 6], [6, 6, 7, 6, 6], [6, 7, 6, 7, 6], [7, 6, 6, 6, 7]]`.
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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(invert_matrix([[6, 7, 7, 7, 6], [7, 6, 7, 6, 7], [7, 7, 6, 7, 7], [7, 6, 7, 6, 7], [6, 7, 7, 7, 6]]), [[7, 6, 6, 6, 7], [6, 7, 6, 7, 6], [6, 6, 7, 6, 6], [6, 7, 6, 7, 6], [7, 6, 6, 6, 7]])`)
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}})
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```
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`invert_matrix([[1.2, 2.1, 2.1, 2.1], [2.1, 1.2, 2.1, 1.2], [1.2, 1.2, 2.1, 2.1]])` should return `[[2.1, 1.2, 1.2, 1.2], [1.2, 2.1, 1.2, 2.1], [2.1, 2.1, 1.2, 1.2]]`.
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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(invert_matrix([[1.2, 2.1, 2.1, 2.1], [2.1, 1.2, 2.1, 1.2], [1.2, 1.2, 2.1, 2.1]]), [[2.1, 1.2, 1.2, 1.2], [1.2, 2.1, 1.2, 2.1], [2.1, 2.1, 1.2, 1.2]])`)
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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 invert_matrix(matrix):
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return matrix
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```
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# --solutions--
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```py
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def invert_matrix(matrix):
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flat = [cell for row in matrix for cell in row]
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values = list(set(flat))
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val1, val2 = values
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return [[val2 if cell == val1 else val1 for cell in row] for row in matrix]
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```
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