With the introduction of #22, we're now able to add multiple patterns per question. As a result, it'd be helpful to filter the question list by more than one pattern.

Investigate starting here: https://www.w3schools.com/tags/att_select_multiple.asp

It'd be great to have a suggested approach when solving questions, including:

• How long to spend on a never before seen leetcode question
• Where to go for the solution(s) and how to identify & study the optimal ones
• How to learn for your own learning style (ie. visual, hands-on etc)

#9 made me realize that the question list only looks 'sorted' since the source file, https://github.com/SeanPrashad/leetcode-patterns/blob/master/src/data/index.js, has the question list conveniently sorted already.

However, this will become a problem when we begin adding new questions that add to existing categories, essentially showing the questions out of place.

Let's look into using react-table's UseSortBy method to implement custom sorting by pattern, then difficulty, then question name.

another annoying update from yours truly :)

Currently, if new questions are added here, then any user who visited the site prior to the addition will not be able to use the checkbox to mark off new questions as the array in their local storage won't have indexes for the new questions (ie. it will be short).

We should account for this and update the initialization to handle if the localStorage array already exists and differs in size, then we should create a new array, copy over the old values, and save it over the existing array.

Would be great to keep track of questions solved / total number of questions. Thanks.

Also, checkout: Striver's list if you're adding more problems to the list.

Hi @seanprashad,
I would like to suggest using a license for this website. You may refer to choosealicense.com, a site maintained by GitHub, for picking a license. This website also explains how licenses work and describe some popular licenses in detail.

This bug is a result of my patch in #72 - look into reverting and adding the solutions in a better location

As I filter anything, everything vanishes.
It is working fine on safari, but not on Google Chrome. Please check whats the issue.

It would be great if we can hide topic tags for unsolved problems, knowing which algorithm to use beforehand restricts the thinking process in one direction.

Hi, it would be helpful if one could filter questions by clicking on company logo or having a search bar near the company header to search for questions asked by a particular company or a set of companies.

Currently, each question is chosen to fit into a specific pattern, even if it might be applicable to other ones (ie. Some tree questions can be completed via DFS/BFS).

Original suggestion: Also, I see that currently there is only one pattern per LC problem, I would suggest we change it to an array and support multiple patterns per problem.

Originally posted by @mm1705 in #7 (comment)

Preserving the filtering, especially the Companies filtering, after a refresh or when closing the page and opening it again, is a good idea. Recording that information in the cookies seems like an easy fix.

Originally I had intended for this repo to be used solely by myself as I worked through questions over the past summer.

With the repo being open-sourced now, it makes sense to move my solutions to a solutions branch, and convert the repo into a template repository so that others can create their own personal copy tailored to their individual journey.

Currently we only sort by Difficulty, which leads to some questions not being ordered properly - see Target Sum below:

As I'm continuing my own studies, I realized that there are some missing categories that would be very helpful, such as:

• Design
• Trie
• Greedy

When adding these new patterns, we should update the existing questions and their respective pattern, if need be, in src/data/index.js.

https://leetcode.com/problems/target-sum/ is related to DP and DFS more and lesser to Backtracking.
Can we change it's tagging?

The total question count is just showing the number of easy questions count.

It'd be helpful to show a small lock icon beside questions that are hidden behind Leetcode Premium!

Hi,

First of all wanted to say thank you for collating different patterns of problems. Very helpful.

Now I would really love an ability to hide solved problems, or at-least show a count to user to how many problems he has already solved and how many are remaining.

Thank you.

Following steps to re-create this issue:

1. Filter problems with any difficulty. (In the screenshot "easy" is selected)
2. After this, filter out with any company. (Over here "Capital One" is selected)

In the screenshot, one can see it filters out with Capital One and clearly disregard the "easy" difficulty filter. I think UI should either incorporate "smart filtering" - results considering both the filters OR reset the previously selected filter from the screen.

For some of the premium questions, they have a trailing / which is expected, since the regular questions all do. However for some questions, like Alien Dictionary, they don't have a trailing / and so we have to append one so it's a valid URL.

However, the logic is incorrect for how we perform this:

https://github.com/SeanPrashad/leetcode-patterns/blob/126989c5aa122ddc4e35acc81b984916af75adde/src/components/Table/index.js#L192

I dont see the subset pattern

Remove Duplicates from Sorted List is listed twice.

Container With Most Water question is a LC medium but its tagged as LC hard.

Need another column to point out the solution, in case if anyone wants to have a look at it. It could be visible based on the preferences.

In #72, we combined the Name and Url column into one in order to nicely fit the Solutions column, which linked to Leetcode Discuss.

As a result, filtering capability for the new Question column (ie. the column meant to replace Name and Url) is broken since it's contents are now a custom function and we can't filter by plain text anymore (since it's a hyperlink now).

I think we should be able to take notes on each of the problems. Could be stored in local storage just like the check marks

Hi Sean, thanks for making this site and keeping it up to date. I've been going through the problems and I found that the Insert Interval question is a medium question in LeetCode, but its tagged as a hard question on your website.

Leetcode discuss is an excellent way to share and view current and previously asked questions by some of the major tech firms!

Let's consider adding this to the docs

Would it make more sense if pattern was a drop down?

Hi Sean Prasad ,the list you have provided is quite great I will suggest u to add these 2 problem in binary search as these are very popular interview problem quite known by name .I will update you if i will face any other good problem.These two problem are unique .

So, there is a total number of questions present there, but I think it would be beneficial if we could also see the number of questions we have done, including the number of easy medium and hard questions number in the list. I think it would be pretty useful feature. Also, if it is approved, I would like to work upon it, too.

TODO before my Leetcode Premium subscription runs out in a few days!

Investigate if it is possible to freeze the headers for the table so it's possible to adjust filters when scrolling down the page.

The current repo name, lc, was used as it was short and easy for me to cd into using z .

For better visibility, we should consider renaming from lc to leetcode-patterns, leetcode-study-guide, leetcode-pattern-study-guide, or some other variant that better depicts to users the meaning/usage behind this repo.

A follow-up to #31 - let's show patterns for completed questions (denoted by the checkbox for the respective row).

I think progression labels on the top (e.g. Total: 75/170, Easy: 14/36, Medium: 53/102, Hard: 8/32) should be reflecting the list that's present on the screen. This is not something important, but just realized that they were not changing and felt like mentioning it :)

If it is possible can you add some kind of tables where we can see how many easy/medium/hard questions we already done on the top of the page

If the problem is to be solved inplace, we will get to the solution either by

1. swapping the corressponding values.
2. Storing one or more different values in the same pointer

Currently, Companies are shown for each problem. If we hover over the icon, the company name is displayed.
How about when we hover over the company icon, we provide an option to click which results in a list of filtered LC questions for the current company?
We may also change Companies to a dropdown like Pattern and Difficulty.

Longest Substring Without Repeating Characters is a LC medium but is tagged as hard

Each question that is found in the list has a specific purpose on what the learning outcome/new technique an individual adds to their own toolkit.

For example, the Subsets question introduces a Backtracking skeleton, which can be almost copy-pasted for other similar questions, like Permutations and Generate Parentheses.

I think it'd be great to have a hidden field that reveals the intended learning outcome when clicked. It could also be a tooltip that displays the optimal time/space complexity in addition to a short blurb about the outcome.

Why do I see two different sets of questions on different devices. One of my device shows questions like arrays and stuff early on while my laptop and pc both show questions in this order -

  |   | Contains Duplicate | https://leetcode.com/problems/contains-duplicate/ | Arrays | Easy |  
  |   | Missing Number | https://leetcode.com/problems/missing-number/ | ArraysBit Manipulation | Easy |  
  |   | Find All Numbers Disappeared in an Array | https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/ | Arrays | Easy |  
  |   | Single Number | https://leetcode.com/problems/single-number/ | ArraysBit Manipulation | Easy |  
  |   | Climbing Stairs | https://leetcode.com/problems/climbing-stairs/ | Dynamic Programming | Easy |  
  |   | House Robber | https://leetcode.com/problems/house-robber/ | Dynamic Programming | Easy |  
  |   | Best Time to Buy and Sell Stock | https://leetcode.com/problems/best-time-to-buy-and-sell-stock/

DP question starts just at number 5 in this set.

Even though there is a "Show/Hide Patterns" slide, it seem that most of the questions are clustered together when they share patterns within a difficulty.

Even though I try not to pay attention to the revealed patterns of the near by questions, I often see them. This gives me a very good hint on how to approach to a problem which I won't have when I will be in an interview.

A shuffle button/slide (some might want to get the original ordering back) would solve that problem since I wouldn't be able to guess the pattern with the ordering randomized.

Hey Sean, thank you for the list, it has been really helpful. I was wondering whether it would be possible to add a switch or something at the top to toggle on/off the pattern types for each question. Currently all the pattern types are hidden unless a user clicks check at the left. While hiding the pattern type is definitely useful, I imagine that there are quite a few people who may be trying to find questions for a certain pattern type. Hence the ability to toggle on/off the pattern types would be really useful. Thanks in advance!

It'd be nice to have a column that would show you when you last solved the question! This could be useful for individuals who want to re-attempt previous questions that gave them trouble (like Backtracking for me)