ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
81 lines
1.5 KiB
Markdown
81 lines
1.5 KiB
Markdown
---
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id: 5a23c84252665b21eecc7eb1
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title: 身份矩阵
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challengeType: 5
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videoUrl: ''
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dashedName: identity-matrix
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---
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# --description--
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*单位矩阵*是大小为\\（n \\次n \\）的方阵，其中对角元素都是**1** s（1），所有其他元素都是**0** s（零）。 \\ begin {bmatrix} 1＆0＆0 \\ cr 0＆1＆0 \\ cr 0＆0＆1 \\ cr \\ end {bmatrix}编写一个以数字'n'作为参数并返回单位矩阵的函数订单nx n。
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# --hints--
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`idMatrix`应该是一个功能。
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```js
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assert(typeof idMatrix == 'function');
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```
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`idMatrix(1)`应该返回一个数组。
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```js
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assert(Array.isArray(idMatrix(1)));
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```
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`idMatrix(1)`应返回`"+JSON.stringify(results[0])+"` 。
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```js
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assert.deepEqual(idMatrix(1), results[0]);
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```
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`idMatrix(2)`应返回`"+JSON.stringify(results[1])+"` 。
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```js
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assert.deepEqual(idMatrix(2), results[1]);
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```
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`idMatrix(3)`应返回`"+JSON.stringify(results[2])+"` 。
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```js
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assert.deepEqual(idMatrix(3), results[2]);
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```
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`idMatrix(4)`应返回`"+JSON.stringify(results[3])+"` 。
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```js
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assert.deepEqual(idMatrix(4), results[3]);
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```
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# --seed--
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## --after-user-code--
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```js
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let results=[[ [ 1 ] ],
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[ [ 1, 0 ], [ 0, 1 ] ],
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[ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, 1 ] ],
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[ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ]]
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```
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## --seed-contents--
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```js
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function idMatrix(n) {
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}
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```
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# --solutions--
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```js
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function idMatrix(n) {
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return Array.apply(null, new Array(n)).map(function (x, i, xs) {
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return xs.map(function (_, k) {
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return i === k ? 1 : 0;
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})
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});
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}
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```
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