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87 lines
2.4 KiB
Markdown
87 lines
2.4 KiB
Markdown
---
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id: 699c8e045ee7cb94ed2322dc
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title: "Challenge 221: Inverted Matrix"
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challengeType: 28
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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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`invertMatrix([["a", "b"], ["a", "a"]])` should return `[["b", "a"], ["b", "b"]]`.
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```js
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assert.deepEqual(invertMatrix([["a", "b"], ["a", "a"]]), [["b", "a"], ["b", "b"]]);
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```
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`invertMatrix([[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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assert.deepEqual(invertMatrix([[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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`invertMatrix([["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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assert.deepEqual(invertMatrix([["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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`invertMatrix([[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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assert.deepEqual(invertMatrix([[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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`invertMatrix([[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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assert.deepEqual(invertMatrix([[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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# --seed--
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## --seed-contents--
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```js
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function invertMatrix(matrix) {
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return matrix;
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}
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```
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# --solutions--
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```js
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function invertMatrix(matrix) {
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if (matrix.length === 0) return [];
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const values = [...new Set(matrix.flat())];
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const [val1, val2] = values;
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return matrix.map(row =>
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row.map(cell => (cell === val1 ? val2 : val1))
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);
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}
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```
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