diff --git a/.gitignore b/.gitignore
index 5d5431b..fb47e28 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,4 @@
 # Byte-compiled / optimized / DLL files
-Solutions/DataStructures/__pycache__
 __pycache__/*
 *.py[cod]
 *.pyo
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 335be87..db08ac0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -14,32 +14,31 @@ contributors, you agree and confirm that:
 
 -   Your work will be distributed under [MIT License](LICENSE.md) once your pull
     request is merged.
--   You submitted work fulfils the styles and standards of this repository.
+-   You submitted work fulfills the styles and standards of this repository.
 
 ### Contribution
 
-Any contribution, from fixing a grammatical mistake in a comment to improvising current
+Any contribution, from fixing a grammatical errors in a comment to improvising current
 solutions is appriciated.
 
 **New implementation** is welcome as long as the solution improvises the
 `Time Complexity` and/or `Space Complexity` without deteriorating the either of them
-compared to the current solution! But **identical implementation** of an existing
-solution is not allowed.
+compared to the current solution. But **identical implementation** of an existing
+solution will not be accepted.
 
 **Improving comments** are also highly welcome. But **fake pull requests**, like
-_unnecessarily changing the wording or adding 'a' or 'the', are highly discouraged_.
+_unnecessarily changing the wording, adding 'a' or 'the', etc_ are highly discouraged.
 Such pull requests will be closed immediately and labeled as `invalid`.
 
 ### Other Requirements for Submissions
 
 -   Use [black](https://pypi.org/project/black/) to format you code.
--   Strictly use **PascalCase** for class names and**snake_case** in your variable and
+-   Strictly use **PascalCase** for class names and **snake_case** in your variable and
     function names.
--   If you have modified/added code work, make sure the code compiles before
-    submitting.
 -   If you have modified/added documentation work, ensure your language is concise and
     contains no grammatical errors.
--   Do not update the README.md file.
+-   If you have modified/added code work, make sure the code compiles before
+    submitting.
 -   Make sure to add
     [**Python type hints**](https://docs.python.org/3/library/typing.html) to all
     functions and methods.
diff --git a/LICENSE b/LICENSE
index 6a2ce18..a69e6b7 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2019 Tapajyoti Bose
+Copyright (c) 2021 Tapajyoti Bose
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 0689cb5..d0b6250 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,6 @@
 
 This repository contains the **[Daily Coding Problem](https://www.dailycodingproblem.com)** solutions in python.
 
-## Contribution Guidelines
-
-Read our [Contribution Guidelines](CONTRIBUTING.md) before you contribute.
-
 ## Setup
 
 Install the 3rd party packages, perform the following steps:
@@ -13,6 +9,10 @@ Install the 3rd party packages, perform the following steps:
 1.  `cd Daily-Coding-Challenge-Solutions`
 2.  Run `pip install -r requirements.txt`
 
+## Contribution Guidelines
+
+Please go through [Contribution Guidelines](CONTRIBUTING.md) before you contribute.
+
 ## Note:
 
 1. Modules `numpy` and `matplotlib` are used for presentation purpose only and hence are optional.
diff --git a/Solutions/364.py b/Solutions/364.py
index 4eeae33..9691e29 100644
--- a/Solutions/364.py
+++ b/Solutions/364.py
@@ -33,8 +33,8 @@ def get_longest_increasing_subsequence(arr: List[int]) -> int:
             tail_table[result_length] = arr[i]
             result_length += 1
         else:
-            # current element is the last candidate of an existing subsequence.
-            # it will replace ceil value in tail_table
+            # current element is the last candidate of an existing subsequence and will
+            # replace ceil value in tail_table
             tail_table[get_ceil_index(tail_table, -1, result_length - 1, arr[i])] = arr[
                 i
             ]
diff --git a/requirements.txt b/requirements.txt
index 20f820f..3a26d19 100644
Binary files a/requirements.txt and b/requirements.txt differ