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214 changes: 107 additions & 107 deletions README.md
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Expand Up @@ -34,7 +34,6 @@ implementation 'com.github.javadev:leetcode-in-java:1.37'
> ["For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."](https://www.quora.com/How-effective-is-Leetcode-for-preparing-for-technical-interviews)

##
* [Data Structure I](#data-structure-i)
* [Data Structure II](#data-structure-ii)
* [Algorithm I](#algorithm-i)
* [Algorithm II](#algorithm-ii)
Expand All @@ -48,111 +47,7 @@ implementation 'com.github.javadev:leetcode-in-java:1.37'
* [Level 1](#level-1)
* [Level 2](#level-2)
* [Udemy](#udemy)

### Data Structure I

#### Day 1 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0217 |[Contains Duplicate](src/main/java/g0201_0300/s0217_contains_duplicate/Solution.java)| Easy | Top_Interview_Questions, Array, Hash_Table, Sorting | 6 | 96.68
| 0053 |[Maximum Subarray](src/main/java/g0001_0100/s0053_maximum_subarray/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) | 1 | 100.00

#### Day 2 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0001 |[Two Sum](src/main/java/g0001_0100/s0001_two_sum/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task | 2 | 85.97
| 0088 |[Merge Sorted Array](src/main/java/g0001_0100/s0088_merge_sorted_array/Solution.java)| Easy | Top_Interview_Questions, Array, Sorting, Two_Pointers | 0 | 100.00

#### Day 3 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0350 |[Intersection of Two Arrays II](src/main/java/g0301_0400/s0350_intersection_of_two_arrays_ii/Solution.java)| Easy | Array, Hash_Table, Sorting, Binary_Search, Two_Pointers | 4 | 69.62
| 0121 |[Best Time to Buy and Sell Stock](src/main/java/g0101_0200/s0121_best_time_to_buy_and_sell_stock/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) | 1 | 100.00

#### Day 4 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0566 |[Reshape the Matrix](src/main/java/g0501_0600/s0566_reshape_the_matrix/Solution.java)| Easy | Array, Matrix, Simulation | 1 | 90.08
| 0118 |[Pascal's Triangle](src/main/java/g0101_0200/s0118_pascals_triangle/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming | 1 | 67.08

#### Day 5 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0036 |[Valid Sudoku](src/main/java/g0001_0100/s0036_valid_sudoku/Solution.java)| Medium | Top_Interview_Questions, Array, Hash_Table, Matrix | 1 | 100.00
| 0074 |[Search a 2D Matrix](src/main/java/g0001_0100/s0074_search_a_2d_matrix/Solution.java)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 0 | 100.00

#### Day 6 String

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0387 |[First Unique Character in a String](src/main/java/g0301_0400/s0387_first_unique_character_in_a_string/Solution.java)| Easy | String, Hash_Table, Counting, Queue | 1 | 100.00
| 0383 |[Ransom Note](src/main/java/g0301_0400/s0383_ransom_note/Solution.java)| Easy | String, Hash_Table, Counting | 1 | 99.97
| 0242 |[Valid Anagram](src/main/java/g0201_0300/s0242_valid_anagram/Solution.java)| Easy | String, Hash_Table, Sorting | 2 | 99.01

#### Day 7 Linked List

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0141 |[Linked List Cycle](src/main/java/g0101_0200/s0141_linked_list_cycle/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) | 0 | 100.00
| 0021 |[Merge Two Sorted Lists](src/main/java/g0001_0100/s0021_merge_two_sorted_lists/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) | 0 | 100.00
| 0203 |[Remove Linked List Elements](src/main/java/g0201_0300/s0203_remove_linked_list_elements/Solution.java)| Easy | Linked_List, Recursion | 1 | 98.82

#### Day 8 Linked List

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0206 |[Reverse Linked List](src/main/java/g0201_0300/s0206_reverse_linked_list/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) | 0 | 100.00
| 0083 |[Remove Duplicates from Sorted List](src/main/java/g0001_0100/s0083_remove_duplicates_from_sorted_list/Solution.java)| Easy | Linked_List | 0 | 100.00

#### Day 9 Stack Queue

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0020 |[Valid Parentheses](src/main/java/g0001_0100/s0020_valid_parentheses/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) | 1 | 98.78
| 0232 |[Implement Queue using Stacks](src/main/java/g0201_0300/s0232_implement_queue_using_stacks/MyQueue.java)| Easy | Stack, Design, Queue | 1 | 67.21

#### Day 10 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0144 |[Binary Tree Preorder Traversal](src/main/java/g0101_0200/s0144_binary_tree_preorder_traversal/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Stack | 1 | 48.38
| 0094 |[Binary Tree Inorder Traversal](src/main/java/g0001_0100/s0094_binary_tree_inorder_traversal/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
| 0145 |[Binary Tree Postorder Traversal](src/main/java/g0101_0200/s0145_binary_tree_postorder_traversal/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Stack | 1 | 49.11

#### Day 11 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0102 |[Binary Tree Level Order Traversal](src/main/java/g0101_0200/s0102_binary_tree_level_order_traversal/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) | 1 | 91.09
| 0104 |[Maximum Depth of Binary Tree](src/main/java/g0101_0200/s0104_maximum_depth_of_binary_tree/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) | 0 | 100.00
| 0101 |[Symmetric Tree](src/main/java/g0101_0200/s0101_symmetric_tree/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) | 0 | 100.00

#### Day 12 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0226 |[Invert Binary Tree](src/main/java/g0201_0300/s0226_invert_binary_tree/Solution.java)| Easy | Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
| 0112 |[Path Sum](src/main/java/g0101_0200/s0112_path_sum/Solution.java)| Easy | Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree | 0 | 100.00

#### Day 13 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0700 |[Search in a Binary Search Tree](src/main/java/g0601_0700/s0700_search_in_a_binary_search_tree/Solution.java)| Easy | Tree, Binary_Tree, Binary_Search_Tree | 0 | 100.00
| 0701 |[Insert into a Binary Search Tree](src/main/java/g0701_0800/s0701_insert_into_a_binary_search_tree/Solution.java)| Medium | Tree, Binary_Tree, Binary_Search_Tree | 0 | 100.00

#### Day 14 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0098 |[Validate Binary Search Tree](src/main/java/g0001_0100/s0098_validate_binary_search_tree/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) | 0 | 100.00
| 0653 |[Two Sum IV - Input is a BST](src/main/java/g0601_0700/s0653_two_sum_iv_input_is_a_bst/Solution.java)| Easy | Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree | 5 | 74.23
| 0235 |[Lowest Common Ancestor of a Binary Search Tree](src/main/java/g0201_0300/s0235_lowest_common_ancestor_of_a_binary_search_tree/Solution.java)| Medium | Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree | 4 | 100.00
* [Data Structure I](#data-structure-i)

### Data Structure II

Expand Down Expand Up @@ -466,7 +361,7 @@ implementation 'com.github.javadev:leetcode-in-java:1.37'
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0117 |[Populating Next Right Pointers in Each Node II](src/main/java/g0101_0200/s0117_populating_next_right_pointers_in_each_node_ii/Solution.java)| Medium | Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List | 0 | 100.00
| 0572 |[Subtree of Another Tree](src/main/java/g0501_0600/s0572_subtree_of_another_tree/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching | 1 | 100.00
| 0572 |[Subtree of Another Tree](src/main/java/g0501_0600/s0572_subtree_of_another_tree/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching | 2 | 97.06

#### Day 8 Breadth First Search Depth First Search

Expand Down Expand Up @@ -1844,6 +1739,111 @@ implementation 'com.github.javadev:leetcode-in-java:1.37'
|-|-|-|-|-|-
| 0155 |[Min Stack](src/main/java/g0101_0200/s0155_min_stack/MinStack.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) | 3 | 100.00

### Data Structure I

#### Day 1 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0217 |[Contains Duplicate](src/main/java/g0201_0300/s0217_contains_duplicate/Solution.java)| Easy | Top_Interview_Questions, Array, Hash_Table, Sorting | 6 | 96.68
| 0053 |[Maximum Subarray](src/main/java/g0001_0100/s0053_maximum_subarray/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) | 1 | 100.00

#### Day 2 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0001 |[Two Sum](src/main/java/g0001_0100/s0001_two_sum/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task | 2 | 85.97
| 0088 |[Merge Sorted Array](src/main/java/g0001_0100/s0088_merge_sorted_array/Solution.java)| Easy | Top_Interview_Questions, Array, Sorting, Two_Pointers | 0 | 100.00

#### Day 3 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0350 |[Intersection of Two Arrays II](src/main/java/g0301_0400/s0350_intersection_of_two_arrays_ii/Solution.java)| Easy | Array, Hash_Table, Sorting, Binary_Search, Two_Pointers | 4 | 69.62
| 0121 |[Best Time to Buy and Sell Stock](src/main/java/g0101_0200/s0121_best_time_to_buy_and_sell_stock/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) | 1 | 100.00

#### Day 4 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0566 |[Reshape the Matrix](src/main/java/g0501_0600/s0566_reshape_the_matrix/Solution.java)| Easy | Array, Matrix, Simulation | 1 | 90.08
| 0118 |[Pascal's Triangle](src/main/java/g0101_0200/s0118_pascals_triangle/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming | 1 | 67.08

#### Day 5 Array

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0036 |[Valid Sudoku](src/main/java/g0001_0100/s0036_valid_sudoku/Solution.java)| Medium | Top_Interview_Questions, Array, Hash_Table, Matrix | 1 | 100.00
| 0074 |[Search a 2D Matrix](src/main/java/g0001_0100/s0074_search_a_2d_matrix/Solution.java)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 0 | 100.00

#### Day 6 String

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0387 |[First Unique Character in a String](src/main/java/g0301_0400/s0387_first_unique_character_in_a_string/Solution.java)| Easy | String, Hash_Table, Counting, Queue | 1 | 100.00
| 0383 |[Ransom Note](src/main/java/g0301_0400/s0383_ransom_note/Solution.java)| Easy | String, Hash_Table, Counting | 1 | 99.97
| 0242 |[Valid Anagram](src/main/java/g0201_0300/s0242_valid_anagram/Solution.java)| Easy | String, Hash_Table, Sorting | 2 | 99.01

#### Day 7 Linked List

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0141 |[Linked List Cycle](src/main/java/g0101_0200/s0141_linked_list_cycle/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) | 0 | 100.00
| 0021 |[Merge Two Sorted Lists](src/main/java/g0001_0100/s0021_merge_two_sorted_lists/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) | 0 | 100.00
| 0203 |[Remove Linked List Elements](src/main/java/g0201_0300/s0203_remove_linked_list_elements/Solution.java)| Easy | Linked_List, Recursion | 1 | 98.82

#### Day 8 Linked List

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0206 |[Reverse Linked List](src/main/java/g0201_0300/s0206_reverse_linked_list/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) | 0 | 100.00
| 0083 |[Remove Duplicates from Sorted List](src/main/java/g0001_0100/s0083_remove_duplicates_from_sorted_list/Solution.java)| Easy | Linked_List | 0 | 100.00

#### Day 9 Stack Queue

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0020 |[Valid Parentheses](src/main/java/g0001_0100/s0020_valid_parentheses/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) | 1 | 98.78
| 0232 |[Implement Queue using Stacks](src/main/java/g0201_0300/s0232_implement_queue_using_stacks/MyQueue.java)| Easy | Stack, Design, Queue | 1 | 67.21

#### Day 10 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0144 |[Binary Tree Preorder Traversal](src/main/java/g0101_0200/s0144_binary_tree_preorder_traversal/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Stack | 1 | 48.38
| 0094 |[Binary Tree Inorder Traversal](src/main/java/g0001_0100/s0094_binary_tree_inorder_traversal/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
| 0145 |[Binary Tree Postorder Traversal](src/main/java/g0101_0200/s0145_binary_tree_postorder_traversal/Solution.java)| Easy | Depth_First_Search, Tree, Binary_Tree, Stack | 1 | 49.11

#### Day 11 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0102 |[Binary Tree Level Order Traversal](src/main/java/g0101_0200/s0102_binary_tree_level_order_traversal/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) | 1 | 91.09
| 0104 |[Maximum Depth of Binary Tree](src/main/java/g0101_0200/s0104_maximum_depth_of_binary_tree/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) | 0 | 100.00
| 0101 |[Symmetric Tree](src/main/java/g0101_0200/s0101_symmetric_tree/Solution.java)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) | 0 | 100.00

#### Day 12 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0226 |[Invert Binary Tree](src/main/java/g0201_0300/s0226_invert_binary_tree/Solution.java)| Easy | Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) | 0 | 100.00
| 0112 |[Path Sum](src/main/java/g0101_0200/s0112_path_sum/Solution.java)| Easy | Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree | 0 | 100.00

#### Day 13 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0700 |[Search in a Binary Search Tree](src/main/java/g0601_0700/s0700_search_in_a_binary_search_tree/Solution.java)| Easy | Tree, Binary_Tree, Binary_Search_Tree | 0 | 100.00
| 0701 |[Insert into a Binary Search Tree](src/main/java/g0701_0800/s0701_insert_into_a_binary_search_tree/Solution.java)| Medium | Tree, Binary_Tree, Binary_Search_Tree | 0 | 100.00

#### Day 14 Tree

| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
|-|-|-|-|-|-
| 0098 |[Validate Binary Search Tree](src/main/java/g0001_0100/s0098_validate_binary_search_tree/Solution.java)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) | 0 | 100.00
| 0653 |[Two Sum IV - Input is a BST](src/main/java/g0601_0700/s0653_two_sum_iv_input_is_a_bst/Solution.java)| Easy | Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree | 5 | 74.23
| 0235 |[Lowest Common Ancestor of a Binary Search Tree](src/main/java/g0201_0300/s0235_lowest_common_ancestor_of_a_binary_search_tree/Solution.java)| Medium | Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree | 4 | 100.00

## Contributing
Your ideas/fixes/algorithms are more than welcome!

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