Programming Codes

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1. 2026-06-09 16:36:42

   Same Tree in Python and Java | LeetCode #100

   Learn how to solve Same Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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2. 2026-06-09 16:36:42

   Binary Tree Level Order Traversal in Python and Java | LeetCode #102

   Learn how to solve Binary Tree Level Order Traversal in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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3. 2026-06-09 16:36:42

   Maximum Depth of Binary Tree in Python and Java | LeetCode #104

   Learn how to solve Maximum Depth of Binary Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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4. 2026-06-09 16:36:42

   Construct Binary Tree from Preorder and Inorder Traversal in Python and Java | LeetCode #105

   Learn how to solve Construct Binary Tree from Preorder and Inorder Traversal in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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5. 2026-06-09 16:36:42

   Container With Most Water in Python and Java | LeetCode #11

   Learn how to solve Container With Most Water in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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6. 2026-06-09 16:36:42

   Longest Common Subsequence in Python and Java | LeetCode #1143

   Learn how to solve Longest Common Subsequence in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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7. 2026-06-09 16:36:42

   Best Time to Buy and Sell Stock in Python and Java | LeetCode #121

   Learn how to solve Best Time to Buy and Sell Stock in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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8. 2026-06-09 16:36:42

   Binary Tree Maximum Path Sum in Python and Java | LeetCode #124

   Learn how to solve Binary Tree Maximum Path Sum in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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9. 2026-06-09 16:36:42

   Valid Palindrome in Python and Java | LeetCode #125

   Learn how to solve Valid Palindrome in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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10. 2026-06-09 16:36:42

    Longest Consecutive Sequence in Python and Java | LeetCode #128

    Learn how to solve Longest Consecutive Sequence in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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11. 2026-06-09 16:36:42

    Clone Graph in Python and Java | LeetCode #133

    Learn how to solve Clone Graph in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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12. 2026-06-09 16:36:42

    Word Break in Python and Java | LeetCode #139

    Learn how to solve Word Break in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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13. 2026-06-09 16:36:42

    Linked List Cycle in Python and Java | LeetCode #141

    Learn how to solve Linked List Cycle in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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14. 2026-06-09 16:36:42

    Reorder List in Python and Java | LeetCode #143

    Learn how to solve Reorder List in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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15. 2026-06-09 16:36:42

    Three Sum in Python and Java | LeetCode #15

    Learn how to solve Three Sum in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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16. 2026-06-09 16:36:42

    Maximum Product Subarray in Python and Java | LeetCode #152

    Learn how to solve Maximum Product Subarray in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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17. 2026-06-09 16:36:42

    Remove Nth Node From End of List in Python and Java | LeetCode #19

    Learn how to solve Remove Nth Node From End of List in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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18. 2026-06-09 16:36:42

    Reverse Bits in Python and Java | LeetCode #190

    Learn how to solve Reverse Bits in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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19. 2026-06-09 16:36:42

    Number of 1 Bits in Python and Java | LeetCode #191

    Learn how to solve Number of 1 Bits in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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20. 2026-06-09 16:36:42

    House Robber in Python and Java | LeetCode #198

    Learn how to solve House Robber in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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21. 2026-06-09 16:36:42

    Valid Parentheses in Python and Java | LeetCode #20

    Learn how to solve Valid Parentheses in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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22. 2026-06-09 16:36:42

    Number of Islands in Python and Java | LeetCode #200

    Learn how to solve Number of Islands in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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23. 2026-06-09 16:36:42

    Reverse Linked List in Python and Java | LeetCode #206

    Learn how to solve Reverse Linked List in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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24. 2026-06-09 16:36:42

    Course Schedule in Python and Java | LeetCode #207

    Learn how to solve Course Schedule in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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25. 2026-06-09 16:36:42

    Implement Trie Prefix Tree in Python and Java | LeetCode #208

    Learn how to solve Implement Trie Prefix Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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26. 2026-06-09 16:36:42

    Merge Two Sorted Lists in Python and Java | LeetCode #21

    Learn how to solve Merge Two Sorted Lists in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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27. 2026-06-09 16:36:42

    Design Add and Search Words Data Structure in Python and Java | LeetCode #211

    Learn how to solve Design Add and Search Words Data Structure in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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28. 2026-06-09 16:36:42

    Word Search II in Python and Java | LeetCode #212

    Learn how to solve Word Search II in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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29. 2026-06-09 16:36:42

    House Robber II in Python and Java | LeetCode #213

    Learn how to solve House Robber II in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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30. 2026-06-09 16:36:42

    Contains Duplicate in Python and Java | LeetCode #217

    Learn how to solve Contains Duplicate in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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31. 2026-06-09 16:36:42

    Invert Binary Tree in Python and Java | LeetCode #226

    Learn how to solve Invert Binary Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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32. 2026-06-09 16:36:42

    Merge K Sorted Lists in Python and Java | LeetCode #23

    Learn how to solve Merge K Sorted Lists in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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33. 2026-06-09 16:36:42

    Kth Smallest Element in a BST in Python and Java | LeetCode #230

    Learn how to solve Kth Smallest Element in a BST in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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34. 2026-06-09 16:36:42

    Lowest Common Ancestor of a BST in Python and Java | LeetCode #235

    Learn how to solve Lowest Common Ancestor of a BST in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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35. 2026-06-09 16:36:42

    Product of Array Except Self in Python and Java | LeetCode #238

    Learn how to solve Product of Array Except Self in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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36. 2026-06-09 16:36:42

    Valid Anagram in Python and Java | LeetCode #242

    Learn how to solve Valid Anagram in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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37. 2026-06-09 16:36:42

    Meeting Rooms in Python and Java | LeetCode #252

    Learn how to solve Meeting Rooms in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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38. 2026-06-09 16:36:42

    Meeting Rooms II in Python and Java | LeetCode #253

    Learn how to solve Meeting Rooms II in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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39. 2026-06-09 16:36:42

    Graph Valid Tree in Python and Java | LeetCode #261

    Learn how to solve Graph Valid Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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40. 2026-06-09 16:36:42

    Missing Number in Python and Java | LeetCode #268

    Learn how to solve Missing Number in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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41. 2026-06-09 16:36:42

    Alien Dictionary in Python and Java | LeetCode #269

    Learn how to solve Alien Dictionary in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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42. 2026-06-09 16:36:42

    Encode and Decode Strings in Python and Java | LeetCode #271

    Learn how to solve Encode and Decode Strings in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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43. 2026-06-09 16:36:42

    Find Median from Data Stream in Python and Java | LeetCode #295

    Learn how to solve Find Median from Data Stream in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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44. 2026-06-09 16:36:42

    Serialize and Deserialize Binary Tree in Python and Java | LeetCode #297

    Learn how to solve Serialize and Deserialize Binary Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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45. 2026-06-09 16:36:42

    Longest Substring Without Repeating Characters in Python and Java | LeetCode #3

    Learn how to solve Longest Substring Without Repeating Characters in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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46. 2026-06-09 16:36:42

    Longest Increasing Subsequence in Python and Java | LeetCode #300

    Learn how to solve Longest Increasing Subsequence in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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47. 2026-06-09 16:36:42

    Coin Change in Python and Java | LeetCode #322

    Learn how to solve Coin Change in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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48. 2026-06-09 16:36:42

    Number of Connected Components in an Undirected Graph in Python and Java | LeetCode #323

    Learn how to solve Number of Connected Components in an Undirected Graph in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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49. 2026-06-09 16:36:42

    Search in Rotated Sorted Array in Python and Java | LeetCode #33

    Learn how to solve Search in Rotated Sorted Array in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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50. 2026-06-09 16:36:42

    Counting Bits in Python and Java | LeetCode #338

    Learn how to solve Counting Bits in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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51. 2026-06-09 16:36:42

    Top K Frequent Elements in Python and Java | LeetCode #347

    Learn how to solve Top K Frequent Elements in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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52. 2026-06-09 16:36:42

    Sum of Two Integers in Python and Java | LeetCode #371

    Learn how to solve Sum of Two Integers in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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53. 2026-06-09 16:36:42

    Combination Sum IV in Python and Java | LeetCode #377

    Learn how to solve Combination Sum IV in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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54. 2026-06-09 16:36:42

    Pacific Atlantic Water Flow in Python and Java | LeetCode #417

    Learn how to solve Pacific Atlantic Water Flow in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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55. 2026-06-09 16:36:42

    Longest Repeating Character Replacement in Python and Java | LeetCode #424

    Learn how to solve Longest Repeating Character Replacement in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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56. 2026-06-09 16:36:42

    Non-overlapping Intervals in Python and Java | LeetCode #435

    Learn how to solve Non-overlapping Intervals in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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57. 2026-06-09 16:36:42

    Rotate Image in Python and Java | LeetCode #48

    Learn how to solve Rotate Image in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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58. 2026-06-09 16:36:42

    Group Anagrams in Python and Java | LeetCode #49

    Learn how to solve Group Anagrams in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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59. 2026-06-09 16:36:42

    Longest Palindromic Substring in Python and Java | LeetCode #5

    Learn how to solve Longest Palindromic Substring in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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60. 2026-06-09 16:36:42

    Spiral Matrix in Python and Java | LeetCode #54

    Learn how to solve Spiral Matrix in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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61. 2026-06-09 16:36:42

    Jump Game in Python and Java | LeetCode #55

    Learn how to solve Jump Game in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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62. 2026-06-09 16:36:42

    Merge Intervals in Python and Java | LeetCode #56

    Learn how to solve Merge Intervals in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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63. 2026-06-09 16:36:42

    Insert Interval in Python and Java | LeetCode #57

    Learn how to solve Insert Interval in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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64. 2026-06-09 16:36:42

    Subtree of Another Tree in Python and Java | LeetCode #572

    Learn how to solve Subtree of Another Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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65. 2026-06-09 16:36:42

    Unique Paths in Python and Java | LeetCode #62

    Learn how to solve Unique Paths in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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66. 2026-06-09 16:36:42

    Palindromic Substrings in Python and Java | LeetCode #647

    Learn how to solve Palindromic Substrings in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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67. 2026-06-09 16:36:42

    Climbing Stairs in Python and Java | LeetCode #70

    Learn how to solve Climbing Stairs in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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68. 2026-06-09 16:36:42

    Set Matrix Zeroes in Python and Java | LeetCode #73

    Learn how to solve Set Matrix Zeroes in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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69. 2026-06-09 16:36:42

    Minimum Window Substring in Python and Java | LeetCode #76

    Learn how to solve Minimum Window Substring in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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70. 2026-06-09 16:36:42

    Word Search in Python and Java | LeetCode #79

    Learn how to solve Word Search in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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71. 2026-06-09 16:36:42

    Decode Ways in Python and Java | LeetCode #91

    Learn how to solve Decode Ways in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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72. 2026-06-09 16:36:42

    Validate Binary Search Tree in Python and Java | LeetCode #98

    Learn how to solve Validate Binary Search Tree in Python and Java with beginner-friendly explanation, step-by-step dry run, custom examples, and time complexity.

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73. 2026-06-04 18:05:00

    Find Minimum in Rotated Sorted Array in Python and Java Using Binary Search

    Learn how to solve Find Minimum in Rotated Sorted Array in Python and Java using binary search with beginner-friendly explanation, examples, complete code, and time complexity.

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74. 2026-06-04 13:38:00

    Maximum Subarray Sum in Python and Java Using Kadane's Algorithm

    Learn how to find the maximum subarray sum in Python and Java using Kadane's Algorithm with step-by-step explanation, examples, complete code, and time complexity.

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75. 2026-06-03 21:11:00

    Two Sum Problem in Python and Java Using Hash Map | LeetCode #1

    Learn how to solve the Two Sum problem in Python and Java using a hash map with simple step-by-step explanation, beginner-friendly examples, and time complexity.

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76. 2026-06-02 14:25:00

    Median of Two Sorted Arrays in Python and Java Using Binary Search

    Learn how to find the median of two sorted arrays in Python and Java using binary search with step-by-step explanation, examples, and time complexity.

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77. 2026-06-02 10:30:00

    Reverse a String Without Built-in Methods in Python and Java

    Learn how to reverse a string without built-in reverse methods in Python and Java. This beginner-friendly guide explains the optimized two-pointer approach from scratch.

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78. 2026-06-01 09:30:00

    Sort an Array Without Built-in Methods in Python and Java

    Learn how to sort an array from scratch in Python and Java without built-in sort methods. This beginner-friendly tutorial explains bubble sort with examples, dry run, and complexity.

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