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LeetCode-Sol-Res

Join the chat at https://gitter.im/FreeTymeKiyan/LeetCode-Sol-Res

This repository contains Java solutions and resources for LeetCode Online Judge algorithm problems.

Most of the solutions are derived from my own implementation, the problem discussion section and ninechapter.com, which are cleaned and optimized carefully, thus more readable and understandable!

An excel table for quick review before interview is also provided in resources directory.

Also want to access all codes on your Android phone? Get APAS from GooglePlay!

Features

Understandable Solutions

  • Level Categorization: Easy, Middle and Hard.
  • Problem Description and Tags on Top.
  • Clear Solution Explanation.
  • In-line Comment for Key Points.
  • Different Solutions for Comparison.

Solutions Table for Quick Review

A table for all problems. Great for reference and review purpose!

This table has 5 sheets:

  1. LeetCode Summary(1 ~ 154)
  2. New Free Problems(155 ~ Latest)
  3. New Problems in Book(156 ~ 159, 161, 163, 167, 170, 186)
  4. Tips
  5. Other Classic Problems

Each problem row has name, level, idea, code and frequency analysis.

  • Frequency: derived from online resources and interview experience.
  • Idea: the description of the general idea of the solution.
  • Code: key steps in implementation.
  • Tips: summary of tricks and tips appeared in solutions.
  • New Problems: put into a single page because frequency is unknown.

Important and hard problems have bold title and key points are marked red.

Other Problems

LeetCode problems are not always enough. Some other popular or classic algorithm problems that worth taking a look are put in "Other" directory for your reference.

Resources

Current resources are as followed:

  1. Problems list of Clean Code Handbook published by LeetCode.
  2. An .xlsx file for frequency and solutions.

Todo

  1. Time and Space efficiency.
  2. Add new problems.
  3. Add more resources.

References

  1. LeetCode Online Judge
  2. NineChapter LeetCode Solutions

License

The MIT License (MIT)
  
Copyright (c) 2015 Yang Liu. http://freetymekiyan.github.io  
  
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
  
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
  
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.