🚀 My LeetCode Solutions

Welcome to my LeetCode solutions repository! This collection contains my personal solutions to various LeetCode problems, implemented in SQL and Java.

📊 Statistics

Total Problems Solved: 165
Languages Used: SQL, Java
Topics Covered: Database queries, algorithms, data structures, problem-solving

💡 About This Repository

This repository serves as a documentation of my coding journey and continuous learning process. Each solution represents:

My approach to problem-solving
Implementation of algorithms and data structures
Practice with SQL queries and database concepts
Code optimization and best practices

🎯 Goals

Improve problem-solving skills
Master data structures and algorithms
Enhance SQL query optimization
Maintain consistent coding practice
Track progress over time
Prepare for coding interviews

📝 Solution Format

Each solution typically includes:

Problem description or link
Solution code
Time and space complexity (where applicable)
Explanation of approach (for complex problems)

🛠️ Technologies

Java: Core problem-solving and algorithm implementation
SQL: Database queries and data manipulation

📈 Progress Tracking

I'm continuously adding new solutions and improving existing ones. Feel free to:

Browse through the solutions
Learn from different approaches
Suggest optimizations
Report any issues

🤝 Contributing

While this is a personal learning repository, suggestions and feedback are always welcome! If you spot any errors or have optimization ideas, feel free to open an issue.

📫 Connect With Me

If you'd like to discuss any solutions or connect, feel free to reach out!

⭐ If you find this repository helpful, consider giving it a star!

Happy Coding! 💻

LeetCode Topics

Hash Table

Problem Name	Difficulty
0141-linked-list-cycle	Easy

Linked List

Problem Name	Difficulty
0024-swap-nodes-in-pairs	Medium
0141-linked-list-cycle	Easy
0143-reorder-list	Medium
0328-odd-even-linked-list	Medium
1721-swapping-nodes-in-a-linked-list	Medium

Two Pointers

Problem Name	Difficulty
0125-valid-palindrome	Easy
0141-linked-list-cycle	Easy
0143-reorder-list	Medium
1721-swapping-nodes-in-a-linked-list	Medium

Stack

Problem Name	Difficulty
0143-reorder-list	Medium

Recursion

Problem Name	Difficulty
0024-swap-nodes-in-pairs	Medium
0143-reorder-list	Medium

String

Problem Name	Difficulty
0125-valid-palindrome	Easy

Name		Name	Last commit message	Last commit date
Latest commit History 109 Commits
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0015-3sum		0015-3sum
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0027-remove-element		0027-remove-element
0061-rotate-list		0061-rotate-list
0075-sort-colors		0075-sort-colors
0076-minimum-window-substring		0076-minimum-window-substring
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0125-valid-palindrome		0125-valid-palindrome
0141-linked-list-cycle		0141-linked-list-cycle
0142-linked-list-cycle-ii		0142-linked-list-cycle-ii
0143-reorder-list		0143-reorder-list
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists		0160-intersection-of-two-linked-lists
0187-repeated-dna-sequences		0187-repeated-dna-sequences
0189-rotate-array		0189-rotate-array
0203-remove-linked-list-elements		0203-remove-linked-list-elements
0206-reverse-linked-list		0206-reverse-linked-list
0209-minimum-size-subarray-sum		0209-minimum-size-subarray-sum
0237-delete-node-in-a-linked-list		0237-delete-node-in-a-linked-list
0239-sliding-window-maximum		0239-sliding-window-maximum
0287-find-the-duplicate-number		0287-find-the-duplicate-number
0328-odd-even-linked-list		0328-odd-even-linked-list
0344-reverse-string		0344-reverse-string
0424-longest-repeating-character-replacement		0424-longest-repeating-character-replacement
0443-string-compression		0443-string-compression
0457-circular-array-loop		0457-circular-array-loop
0567-permutation-in-string		0567-permutation-in-string
0643-maximum-average-subarray-i		0643-maximum-average-subarray-i
0680-valid-palindrome-ii		0680-valid-palindrome-ii
0725-split-linked-list-in-parts		0725-split-linked-list-in-parts
0763-partition-labels		0763-partition-labels
0876-middle-of-the-linked-list		0876-middle-of-the-linked-list
0904-fruit-into-baskets		0904-fruit-into-baskets
0930-binary-subarrays-with-sum		0930-binary-subarrays-with-sum
0977-squares-of-a-sorted-array		0977-squares-of-a-sorted-array
1-two-sum		1-two-sum
100-same-tree		100-same-tree
1005-univalued-binary-tree		1005-univalued-binary-tree
101-symmetric-tree		101-symmetric-tree
1013-fibonacci-number		1013-fibonacci-number
1019-squares-of-a-sorted-array		1019-squares-of-a-sorted-array
102-binary-tree-level-order-traversal		102-binary-tree-level-order-traversal
1028-interval-list-intersections		1028-interval-list-intersections
1035-cousins-in-binary-tree		1035-cousins-in-binary-tree
104-maximum-depth-of-binary-tree		104-maximum-depth-of-binary-tree
1079-sum-of-root-to-leaf-binary-numbers		1079-sum-of-root-to-leaf-binary-numbers
108-convert-sorted-array-to-binary-search-tree		108-convert-sorted-array-to-binary-search-tree
110-balanced-binary-tree		110-balanced-binary-tree
111-minimum-depth-of-binary-tree		111-minimum-depth-of-binary-tree
112-path-sum		112-path-sum
1128-remove-all-adjacent-duplicates-in-string		1128-remove-all-adjacent-duplicates-in-string
1135-customers-who-bought-all-products		1135-customers-who-bought-all-products
1153-product-sales-analysis-i		1153-product-sales-analysis-i
1155-product-sales-analysis-iii		1155-product-sales-analysis-iii
1161-project-employees-i		1161-project-employees-i
118-pascals-triangle		118-pascals-triangle
1182-game-play-analysis-iv		1182-game-play-analysis-iv
1245-user-activity-for-the-past-30-days-i		1245-user-activity-for-the-past-30-days-i
125-valid-palindrome		125-valid-palindrome
1258-article-views-i		1258-article-views-i
1278-product-price-at-a-given-date		1278-product-price-at-a-given-date
128-longest-consecutive-sequence		128-longest-consecutive-sequence
1292-immediate-food-delivery-ii		1292-immediate-food-delivery-ii
13-roman-to-integer		13-roman-to-integer
1303-minimum-moves-to-reach-target-score		1303-minimum-moves-to-reach-target-score
1317-monthly-transactions-i		1317-monthly-transactions-i
1338-queries-quality-and-percentage		1338-queries-quality-and-percentage
136-single-number		136-single-number
1371-minimum-remove-to-make-valid-parentheses		1371-minimum-remove-to-make-valid-parentheses
1390-average-selling-price		1390-average-selling-price
14-longest-common-prefix		14-longest-common-prefix
141-linked-list-cycle		141-linked-list-cycle
1415-students-and-examinations		1415-students-and-examinations
143-reorder-list		143-reorder-list
1430-find-the-k-beauty-of-a-number		1430-find-the-k-beauty-of-a-number
144-binary-tree-preorder-traversal		144-binary-tree-preorder-traversal
145-binary-tree-postorder-traversal		145-binary-tree-postorder-traversal
148-sort-list		148-sort-list
1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree		1498-find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree
15-3sum		15-3sum
1509-replace-employee-id-with-the-unique-identifier		1509-replace-employee-id-with-the-unique-identifier
153-find-minimum-in-rotated-sorted-array		153-find-minimum-in-rotated-sorted-array
154-find-minimum-in-rotated-sorted-array-ii		154-find-minimum-in-rotated-sorted-array-ii
155-min-stack		155-min-stack
1570-final-prices-with-a-special-discount-in-a-shop		1570-final-prices-with-a-special-discount-in-a-shop
16-3sum-closest		16-3sum-closest
162-find-peak-element		162-find-peak-element
167-two-sum-ii-input-array-is-sorted		167-two-sum-ii-input-array-is-sorted
17-letter-combinations-of-a-phone-number		17-letter-combinations-of-a-phone-number
1721-swapping-nodes-in-a-linked-list		1721-swapping-nodes-in-a-linked-list
1724-customer-who-visited-but-did-not-make-any-transactions		1724-customer-who-visited-but-did-not-make-any-transactions
1773-percentage-of-users-attended-a-contest		1773-percentage-of-users-attended-a-contest
180-consecutive-numbers		180-consecutive-numbers
1801-average-time-of-process-per-machine		1801-average-time-of-process-per-machine
1827-invalid-tweets		1827-invalid-tweets
1838-frequency-of-the-most-frequent-element		1838-frequency-of-the-most-frequent-element

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🚀 My LeetCode Solutions

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📈 Progress Tracking

🤝 Contributing

📫 Connect With Me

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Linked List

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Stack

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