Was getting an error on start:

@JackHowa ➜ /workspaces/algorithms-exercises (main) $ npm start

> [email protected] start /workspaces/algorithms-exercises
> parcel index.html

ℹ️ Server running at http://localhost:1234
🚨 Build failed.
@parcel/transformer-babel: babelCore(...).loadPartialConfigAsync is not a function
TypeError: babelCore(...).loadPartialConfigAsync is not a function
    at load (/workspaces/algorithms-exercises/node_modules/@parcel/transformer-babel/lib/config.js:115:41)
    at loadConfig (/workspaces/algorithms-exercises/node_modules/@parcel/transformer-babel/lib/BabelTransformer.js:66:30)
    at Transformation.loadTransformerConfig (/workspaces/algorithms-exercises/node_modules/@parcel/core/lib/Transformation.js:741:13)
    at Transformation.loadPipeline (/workspaces/algorithms-exercises/node_modules/@parcel/core/lib/Transformation.js:679:31)
    at async Transformation.loadNextPipeline (/workspaces/algorithms-exercises/node_modules/@parcel/core/lib/Transformation.js:717:24)
    at async Transformation.runPipelines (/workspaces/algorithms-exercises/node_modules/@parcel/core/lib/Transformation.js:434:24)
    at async Transformation.run (/workspaces/algorithms-exercises/node_modules/@parcel/core/lib/Transformation.js:316:19)
    at async Child.handleRequest (/workspaces/algorithms-exercises/node_modules/@parcel/workers/lib/child.js:255:9)

Noticed a peer dependency needed updating via npm i

npm WARN @parcel/[email protected] requires a peer of @babel/core@^7.12.0 but none is installed. You must install peer dependencies yourself.
npm WARN @parcel/[email protected] requires a peer of @babel/core@^7.12.0 but none is installed. You must install peer dependencies yourself.

In the case of right-heavy balancing, left rotation is always the last rotation performed (the only one if it's not a double rotation). A right rotation is performed for a left-heavy tree. The rotateLL method actually performs a right rotation and vice versa. Swapped the names.

The second test fails if the radix sort algorithm is implemented correctly, because it uses Array.prototype.sort(), the default behavior of which is to treat input as strings. A compare function must be supplied to sort numbers correctly.

Hey, there are a few test files which aren't structured properly - when the repo is cloned and npm run test is run there are files for which jest complains: “Tests cannot be nested”. I'll submit a PR to fix this.

I think there is a bug with the pathfinding solution where it doesn't get neighbors correctly when the grid isn't square. https://github.com/btholt/algorithms-exercises/blob/5b2edb0bc08e033d552ea7f9c891d02b49863aa0/specs/pathfinding/pathfinding.solution.test.js#L77

if (y - 1 >= 0 && !visited[y - 1][x].closed) { is up and ln 85 if (y + 1 < visited[0].length && !visited[y + 1][x].closed) { is down. Since we move up and down ln 85 should check visited.length not visited[0].length else it can run out of bounds with non square (rectangular) grids. Conversely ln 95 should be flipped to check visited[0].length since that is left and right and the nested arrays represent Xs max size.

I'm enjoying the course. Thanks!

https://github.com/btholt/algorithms-exercises/blob/5b2edb0bc08e033d552ea7f9c891d02b49863aa0/specs/graph/graph.test.js#L34

I do receive this error message when trying to run the tests locally.

FAIL specs/graph/graph.test.js ● extra credit

 Tests cannot be nested. Test "user 1 with 7 degrees of separation – this will traverse every user that's followed by someone else. five users are unfollowed" cannot run because it is nested within "extra credit".

  73 |
  74 | test("extra credit", function () {
> 75 |   test("user 1 with 7 degrees of separation – this will traverse every user that's followed by someone else. five users are unfollowed", () => {
     |   ^
  76 |     expect(findMostCommonTitle(1, 7)).toBe("Geological Engineer");
  77 |   });
  78 | });

  at Env.it (node_modules/jest-jasmine2/build/jasmine/Env.js:605:19)
  at Object.<anonymous> (specs/graph/graph.test.js:75:3)`

I had to change the outer test to describe

Hi I think the version of the viewer in codesanbox is not working. I compared the version in this repository with the version in Codesanbox and some files are missing.

I tried running the files on my machine locally and they work correctly, but the Codesanbox version only prints the word Hi.

sorry if this issue doesn't go here, I didn't know where to report it.