335 lines
26 KiB
Markdown
335 lines
26 KiB
Markdown
# LeetCode Solutions
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This repository contains my solutions to various LeetCode problems. Each solution is implemented in Python and follows a consistent structure.
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## 📊 Statistics
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- **Total Problems Solved**: 90+
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- **Languages**: Python, TypeScript
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- **Difficulty Distribution**: Easy, Medium, Hard
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## 📁 Solutions Index
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### 🔢 Arrays & Strings
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#### Easy
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- [1. Two Sum](src/exercises/1.two-sum.py) - Hash Table, Array
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- [9. Palindrome Number](src/exercises/9.palindrome-number.py) - Math
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- [13. Roman to Integer](src/exercises/13.roman-to-integer.py) - Hash Table, Math, String
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- [14. Longest Common Prefix](src/exercises/14.longest-common-prefix.py) - String, Trie
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- [20. Valid Parentheses](src/exercises/20.valid-parentheses.py) - Stack, String
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- [21. Merge Two Sorted Lists](src/exercises/21.merge-two-sorted-lists.py) - Linked List, Recursion
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- [26. Remove Duplicates from Sorted Array](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [27. Remove Element](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [28. Find the Index of the First Occurrence in a String](src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py) - String, Two Pointers
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- [35. Search Insert Position](src/exercises/35.search-insert-position.py) - Array, Binary Search
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- [66. Plus One](src/exercises/66.plus-one.py) - Array, Math
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- [69. Sqrt(x)](src/exercises/69.sqrtx.py) - Math, Binary Search
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- [88. Merge Sorted Array](src/exercises/88.merge-sorted-array.py) - Array, Two Pointers
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- [125. Valid Palindrome](src/exercises/125.valid-palindrome.py) - String, Two Pointers
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- [169. Majority Element](src/exercises/169.majority-element.py) - Array, Hash Table, Divide and Conquer
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- [202. Happy Number](src/exercises/202.happy-number.py) - Hash Table, Math, Two Pointers
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- [205. Isomorphic Strings](src/exercises/205.isomorphic-strings.py) - Hash Table, String
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- [217. Contains Duplicate](src/exercises/217.contains-duplicate.py) - Array, Hash Table, Sorting
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- [219. Contains Duplicate II](src/exercises/219.contains-duplicate-ii.py) - Array, Hash Table, Sliding Window
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- [242. Valid Anagram](src/exercises/242.valid-anagram.py) - String, Sorting, Hash Table
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- [290. Word Pattern](src/exercises/290.word-pattern.py) - Hash Table, String
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- [383. Ransom Note](src/exercises/383.ransom-note.py) - String, Hash Table, Counting
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- [392. Is Subsequence](src/exercises/392.is-subsequence.py) - String, Two Pointers, Dynamic Programming
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- [704. Binary Search](src/exercises/704.binary-search.py) - Array, Binary Search
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- [1200. Minimum Absolute Difference](src/exercises/1200.minimum-absolute-difference.py) - Array, Sorting
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- [2053. Kth Distinct String in an Array](src/exercises/2053.kth-distinct-string-in-an-array.py) - Array, Hash Table, String
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- [2441. Largest Positive Integer That Exists With Its Negative](src/exercises/2441.largest-positive-integer-that-exists-with-its-negative.py) - Array, Hash Table, Two Pointers
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#### Medium
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- [2. Add Two Numbers](src/exercises/2.add-two-numbers.py) - Linked List, Math, Recursion
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- [3. Longest Substring Without Repeating Characters](src/exercises/3.longest-substring-without-repeating-characters.py) - Hash Table, String, Sliding Window
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- [3. Longest Substring Without Repeating Characters (TypeScript)](src/exercises/3.longest-substring-without-repeating-characters.ts) - Hash Table, String, Sliding Window
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- [4. Median of Two Sorted Arrays](src/exercises/4.median-of-two-sorted-arrays.py) - Array, Binary Search, Divide and Conquer
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- [5. Longest Palindromic Substring](src/exercises/5.longest-palindromic-substring.py) - String, Dynamic Programming
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- [6. Zigzag Conversion](src/exercises/6.zigzag-conversion.py) - String
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- [7. Reverse Integer](src/exercises/7.reverse-integer.py) - Math
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- [10. Regular Expression Matching](src/exercises/10.regular-expression-matching.py) - String, Dynamic Programming, Recursion
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- [11. Container With Most Water](src/exercises/11.container-with-most-water.py) - Array, Two Pointers, Greedy
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- [15. 3Sum](src/exercises/15.3sum.py) - Array, Two Pointers, Sorting
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- [22. Generate Parentheses](src/exercises/22.generate-parentheses.py) - String, Dynamic Programming, Backtracking
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- [36. Valid Sudoku](src/exercises/36.valid-sudoku.py) - Array, Hash Table, Matrix
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- [42. Trapping Rain Water](src/exercises/42.trapping-rain-water.py) - Array, Two Pointers, Dynamic Programming, Stack
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- [45. Jump Game II](src/exercises/45.jump-game-ii.py) - Array, Dynamic Programming, Greedy
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- [50. Pow(x, n)](src/exercises/50.powx-n.py) - Math, Recursion
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- [55. Jump Game](src/exercises/55.jump-game.py) - Array, Dynamic Programming, Greedy
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- [74. Search a 2D Matrix](src/exercises/74.search-a-2d-matrix.py) - Array, Binary Search, Matrix
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- [80. Remove Duplicates from Sorted Array II](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [89. Gray Code](src/exercises/89.gray-code.py) - Math, Backtracking, Bit Manipulation
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- [90. Subsets II](src/exercises/90.subsets-ii.py) - Array, Backtracking, Bit Manipulation
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- [91. Decode Ways](src/exercises/91.decode-ways.py) - String, Dynamic Programming
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- [92. Reverse Linked List II](src/exercises/92.reverse-linked-list-ii.py) - Linked List
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- [121. Best Time to Buy and Sell Stock](src/exercises/121.best-time-to-buy-and-sell-stock.py) - Array, Dynamic Programming
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- [122. Best Time to Buy and Sell Stock II](src/exercises/122.best-time-to-buy-and-sell-stock-ii.py) - Array, Dynamic Programming, Greedy
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- [128. Longest Consecutive Sequence](src/exercises/128.longest-consecutive-sequence.py) - Array, Hash Table, Union Find
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- [135. Candy](src/exercises/135.candy.py) - Array, Greedy
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- [141. Linked List Cycle](src/exercises/141.linked-list-cycle.py) - Hash Table, Linked List, Two Pointers
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- [149. Max Points on a Line](src/exercises/149.max-points-on-a-line.py) - Array, Hash Table, Math, Geometry
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- [150. Evaluate Reverse Polish Notation](src/exercises/150.evaluate-reverse-polish-notation.py) - Array, Math, Stack
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- [153. Find Minimum in Rotated Sorted Array](src/exercises/153.find-minimum-in-rotated-sorted-array.py) - Array, Binary Search
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- [155. Min Stack](src/exercises/155.min-stack.py) - Stack, Design
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- [167. Two Sum II - Input Array Is Sorted](src/exercises/167.two-sum-ii-input-array-is-sorted.py) - Array, Two Pointers, Binary Search
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- [172. Factorial Trailing Zeroes](src/exercises/172.factorial-trailing-zeroes.py) - Math
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- [189. Rotate Array](src/exercises/189.rotate-array.py) - Array, Math, Two Pointers
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- [206. Reverse Linked List](src/exercises/206.reverse-linked-list.py) - Linked List, Recursion
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- [228. Summary Ranges](src/exercises/228.summary-ranges.py) - Array
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- [238. Product of Array Except Self](src/exercises/238.product-of-array-except-self.py) - Array, Prefix Sum
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- [246. Strobogrammatic Number](src/exercises/246.strobogrammatic-number.py) - Hash Table, Two Pointers, String
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- [248. Strobogrammatic Number III](src/exercises/248.strobogrammatic-number-iii.py) - Math, Recursion
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- [243. Shortest Word Distance](src/exercises/243.shortest-word-distance.py) - Array, String
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- [244. Shortest Word Distance II](src/exercises/244.shortest-word-distance-ii.py) - Array, Hash Table, Design, Two Pointers
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- [245. Shortest Word Distance III](src/exercises/245.shortest-word-distance-iii.py) - Array, String
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- [875. Koko Eating Bananas](src/exercises/875.koko-eating-bananas.py) - Array, Binary Search
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- [990. Satisfiability of Equality Equations](src/exercises/990.satisfiability-of-equality-equations.py) - Array, Union Find, Graph
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- [1298. Maximum Candies You Can Get from Boxes](src/exercises/1298.maximum-candies-you-can-get-from-boxes.py) - Breadth-First Search, Array
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- [1820. Maximum Number of Accepted Invitations](src/exercises/1820.maximum-number-of-accepted-invitations.py) - Graph, Backtracking
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- [2040. Kth Smallest Product of Two Sorted Arrays](src/exercises/2040.kth-smallest-product-of-two-sorted-arrays.py) - Array, Binary Search
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- [2116. Check if a Parentheses String Can Be Valid](src/exercises/2116.check-if-a-parentheses-string-can-be-valid.py) - String, Stack, Greedy
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- [2294. Partition Array Such That Maximum Difference Is K](src/exercises/2294.partition-array-such-that-maximum-difference-is-k.py) - Array, Greedy, Sorting
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- [2616. Minimize the Maximum Difference of Pairs](src/exercises/2616.minimize-the-maximum-difference-of-pairs.py) - Array, Binary Search, Greedy
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- [2966. Divide Array Into Arrays With Max Difference](src/exercises/2966.divide-array-into-arrays-with-max-difference.py) - Array, Greedy, Sorting
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- [3442. Maximum Difference Between Even and Odd Frequency I](src/exercises/3442.maximum-difference-between-even-and-odd-frequency-i.py) - Array, Hash Table
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- [3445. Maximum Difference Between Even and Odd Frequency II](src/exercises/3445.maximum-difference-between-even-and-odd-frequency-ii.py) - Array, Hash Table
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### 🔗 Linked Lists
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- [2. Add Two Numbers](src/exercises/2.add-two-numbers.py) - Linked List, Math, Recursion
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- [21. Merge Two Sorted Lists](src/exercises/21.merge-two-sorted-lists.py) - Linked List, Recursion
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- [92. Reverse Linked List II](src/exercises/92.reverse-linked-list-ii.py) - Linked List
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- [141. Linked List Cycle](src/exercises/141.linked-list-cycle.py) - Hash Table, Linked List, Two Pointers
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- [206. Reverse Linked List](src/exercises/206.reverse-linked-list.py) - Linked List, Recursion
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### 🌳 Trees & Graphs
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- [1298. Maximum Candies You Can Get from Boxes](src/exercises/1298.maximum-candies-you-can-get-from-boxes.py) - Breadth-First Search, Array
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- [1820. Maximum Number of Accepted Invitations](src/exercises/1820.maximum-number-of-accepted-invitations.py) - Graph, Backtracking
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- [990. Satisfiability of Equality Equations](src/exercises/990.satisfiability-of-equality-equations.py) - Array, Union Find, Graph
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### 🔍 Binary Search
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- [4. Median of Two Sorted Arrays](src/exercises/4.median-of-two-sorted-arrays.py) - Array, Binary Search, Divide and Conquer
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- [35. Search Insert Position](src/exercises/35.search-insert-position.py) - Array, Binary Search
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- [50. Pow(x, n)](src/exercises/50.powx-n.py) - Math, Recursion
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- [69. Sqrt(x)](src/exercises/69.sqrtx.py) - Math, Binary Search
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- [74. Search a 2D Matrix](src/exercises/74.search-a-2d-matrix.py) - Array, Binary Search, Matrix
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- [153. Find Minimum in Rotated Sorted Array](src/exercises/153.find-minimum-in-rotated-sorted-array.py) - Array, Binary Search
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- [167. Two Sum II - Input Array Is Sorted](src/exercises/167.two-sum-ii-input-array-is-sorted.py) - Array, Two Pointers, Binary Search
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- [704. Binary Search](src/exercises/704.binary-search.py) - Array, Binary Search
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- [875. Koko Eating Bananas](src/exercises/875.koko-eating-bananas.py) - Array, Binary Search
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- [2040. Kth Smallest Product of Two Sorted Arrays](src/exercises/2040.kth-smallest-product-of-two-sorted-arrays.py) - Array, Binary Search
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- [2616. Minimize the Maximum Difference of Pairs](src/exercises/2616.minimize-the-maximum-difference-of-pairs.py) - Array, Binary Search, Greedy
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### 🧮 Dynamic Programming
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- [5. Longest Palindromic Substring](src/exercises/5.longest-palindromic-substring.py) - String, Dynamic Programming
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- [10. Regular Expression Matching](src/exercises/10.regular-expression-matching.py) - String, Dynamic Programming, Recursion
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- [22. Generate Parentheses](src/exercises/22.generate-parentheses.py) - String, Dynamic Programming, Backtracking
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- [42. Trapping Rain Water](src/exercises/42.trapping-rain-water.py) - Array, Two Pointers, Dynamic Programming, Stack
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- [45. Jump Game II](src/exercises/45.jump-game-ii.py) - Array, Dynamic Programming, Greedy
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- [55. Jump Game](src/exercises/55.jump-game.py) - Array, Dynamic Programming, Greedy
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- [91. Decode Ways](src/exercises/91.decode-ways.py) - String, Dynamic Programming
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- [121. Best Time to Buy and Sell Stock](src/exercises/121.best-time-to-buy-and-sell-stock.py) - Array, Dynamic Programming
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- [122. Best Time to Buy and Sell Stock II](src/exercises/122.best-time-to-buy-and-sell-stock-ii.py) - Array, Dynamic Programming, Greedy
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- [128. Longest Consecutive Sequence](src/exercises/128.longest-consecutive-sequence.py) - Array, Hash Table, Union Find
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- [135. Candy](src/exercises/135.candy.py) - Array, Greedy
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- [392. Is Subsequence](src/exercises/392.is-subsequence.py) - String, Two Pointers, Dynamic Programming
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### 🎯 Two Pointers
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- [3. Longest Substring Without Repeating Characters](src/exercises/3.longest-substring-without-repeating-characters.py) - Hash Table, String, Sliding Window
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- [11. Container With Most Water](src/exercises/11.container-with-most-water.py) - Array, Two Pointers, Greedy
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- [15. 3Sum](src/exercises/15.3sum.py) - Array, Two Pointers, Sorting
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- [26. Remove Duplicates from Sorted Array](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [27. Remove Element](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [28. Find the Index of the First Occurrence in a String](src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py) - String, Two Pointers
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- [42. Trapping Rain Water](src/exercises/42.trapping-rain-water.py) - Array, Two Pointers, Dynamic Programming, Stack
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- [80. Remove Duplicates from Sorted Array II](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
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- [88. Merge Sorted Array](src/exercises/88.merge-sorted-array.py) - Array, Two Pointers
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- [125. Valid Palindrome](src/exercises/125.valid-palindrome.py) - String, Two Pointers
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- [141. Linked List Cycle](src/exercises/141.linked-list-cycle.py) - Hash Table, Linked List, Two Pointers
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- [167. Two Sum II - Input Array Is Sorted](src/exercises/167.two-sum-ii-input-array-is-sorted.py) - Array, Two Pointers, Binary Search
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- [189. Rotate Array](src/exercises/189.rotate-array.py) - Array, Math, Two Pointers
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- [202. Happy Number](src/exercises/202.happy-number.py) - Hash Table, Math, Two Pointers
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- [219. Contains Duplicate II](src/exercises/219.contains-duplicate-ii.py) - Array, Hash Table, Sliding Window
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- [243. Shortest Word Distance](src/exercises/243.shortest-word-distance.py) - Array, String
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- [244. Shortest Word Distance II](src/exercises/244.shortest-word-distance-ii.py) - Array, Hash Table, Design, Two Pointers
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- [245. Shortest Word Distance III](src/exercises/245.shortest-word-distance-iii.py) - Array, String
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- [246. Strobogrammatic Number](src/exercises/246.strobogrammatic-number.py) - Hash Table, Two Pointers, String
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- [392. Is Subsequence](src/exercises/392.is-subsequence.py) - String, Two Pointers, Dynamic Programming
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- [2441. Largest Positive Integer That Exists With Its Negative](src/exercises/2441.largest-positive-integer-that-exists-with-its-negative.py) - Array, Hash Table, Two Pointers
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### 🗃️ Hash Tables
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- [1. Two Sum](src/exercises/1.two-sum.py) - Hash Table, Array
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- [13. Roman to Integer](src/exercises/13.roman-to-integer.py) - Hash Table, Math, String
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- [20. Valid Parentheses](src/exercises/20.valid-parentheses.py) - Stack, String
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- [36. Valid Sudoku](src/exercises/36.valid-sudoku.py) - Array, Hash Table, Matrix
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- [141. Linked List Cycle](src/exercises/141.linked-list-cycle.py) - Hash Table, Linked List, Two Pointers
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- [149. Max Points on a Line](src/exercises/149.max-points-on-a-line.py) - Array, Hash Table, Math, Geometry
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- [169. Majority Element](src/exercises/169.majority-element.py) - Array, Hash Table, Divide and Conquer
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- [202. Happy Number](src/exercises/202.happy-number.py) - Hash Table, Math, Two Pointers
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- [205. Isomorphic Strings](src/exercises/205.isomorphic-strings.py) - Hash Table, String
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- [217. Contains Duplicate](src/exercises/217.contains-duplicate.py) - Array, Hash Table, Sorting
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- [219. Contains Duplicate II](src/exercises/219.contains-duplicate-ii.py) - Array, Hash Table, Sliding Window
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- [242. Valid Anagram](src/exercises/242.valid-anagram.py) - String, Sorting, Hash Table
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- [243. Shortest Word Distance](src/exercises/243.shortest-word-distance.py) - Array, String
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- [244. Shortest Word Distance II](src/exercises/244.shortest-word-distance-ii.py) - Array, Hash Table, Design, Two Pointers
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- [246. Strobogrammatic Number](src/exercises/246.strobogrammatic-number.py) - Hash Table, Two Pointers, String
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- [290. Word Pattern](src/exercises/290.word-pattern.py) - Hash Table, String
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- [383. Ransom Note](src/exercises/383.ransom-note.py) - String, Hash Table, Counting
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- [128. Longest Consecutive Sequence](src/exercises/128.longest-consecutive-sequence.py) - Array, Hash Table, Union Find
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- [2053. Kth Distinct String in an Array](src/exercises/2053.kth-distinct-string-in-an-array.py) - Array, Hash Table, String
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- [2441. Largest Positive Integer That Exists With Its Negative](src/exercises/2441.largest-positive-integer-that-exists-with-its-negative.py) - Array, Hash Table, Two Pointers
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- [3442. Maximum Difference Between Even and Odd Frequency I](src/exercises/3442.maximum-difference-between-even-and-odd-frequency-i.py) - Array, Hash Table
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- [3445. Maximum Difference Between Even and Odd Frequency II](src/exercises/3445.maximum-difference-between-even-and-odd-frequency-ii.py) - Array, Hash Table
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### 📚 Stacks & Queues
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- [20. Valid Parentheses](src/exercises/20.valid-parentheses.py) - Stack, String
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- [42. Trapping Rain Water](src/exercises/42.trapping-rain-water.py) - Array, Two Pointers, Dynamic Programming, Stack
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- [150. Evaluate Reverse Polish Notation](src/exercises/150.evaluate-reverse-polish-notation.py) - Array, Math, Stack
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- [155. Min Stack](src/exercises/155.min-stack.py) - Stack, Design
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- [2116. Check if a Parentheses String Can Be Valid](src/exercises/2116.check-if-a-parentheses-string-can-be-valid.py) - String, Stack, Greedy
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### 🔄 Backtracking
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- [22. Generate Parentheses](src/exercises/22.generate-parentheses.py) - String, Dynamic Programming, Backtracking
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- [89. Gray Code](src/exercises/89.gray-code.py) - Math, Backtracking, Bit Manipulation
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- [90. Subsets II](src/exercises/90.subsets-ii.py) - Array, Backtracking, Bit Manipulation
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- [1820. Maximum Number of Accepted Invitations](src/exercises/1820.maximum-number-of-accepted-invitations.py) - Graph, Backtracking
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### 🎲 Greedy
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- [11. Container With Most Water](src/exercises/11.container-with-most-water.py) - Array, Two Pointers, Greedy
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- [45. Jump Game II](src/exercises/45.jump-game-ii.py) - Array, Dynamic Programming, Greedy
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- [55. Jump Game](src/exercises/55.jump-game.py) - Array, Dynamic Programming, Greedy
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- [122. Best Time to Buy and Sell Stock II](src/exercises/122.best-time-to-buy-and-sell-stock-ii.py) - Array, Dynamic Programming, Greedy
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- [135. Candy](src/exercises/135.candy.py) - Array, Greedy
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- [2116. Check if a Parentheses String Can Be Valid](src/exercises/2116.check-if-a-parentheses-string-can-be-valid.py) - String, Stack, Greedy
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- [2294. Partition Array Such That Maximum Difference Is K](src/exercises/2294.partition-array-such-that-maximum-difference-is-k.py) - Array, Greedy, Sorting
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- [2616. Minimize the Maximum Difference of Pairs](src/exercises/2616.minimize-the-maximum-difference-of-pairs.py) - Array, Binary Search, Greedy
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- [2966. Divide Array Into Arrays With Max Difference](src/exercises/2966.divide-array-into-arrays-with-max-difference.py) - Array, Greedy, Sorting
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### 🔢 Math
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- [7. Reverse Integer](src/exercises/7.reverse-integer.py) - Math
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- [9. Palindrome Number](src/exercises/9.palindrome-number.py) - Math
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- [13. Roman to Integer](src/exercises/13.roman-to-integer.py) - Hash Table, Math, String
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- [50. Pow(x, n)](src/exercises/50.powx-n.py) - Math, Recursion
|
|
- [66. Plus One](src/exercises/66.plus-one.py) - Array, Math
|
|
- [69. Sqrt(x)](src/exercises/69.sqrtx.py) - Math, Binary Search
|
|
- [89. Gray Code](src/exercises/89.gray-code.py) - Math, Backtracking, Bit Manipulation
|
|
- [149. Max Points on a Line](src/exercises/149.max-points-on-a-line.py) - Array, Hash Table, Math, Geometry
|
|
- [172. Factorial Trailing Zeroes](src/exercises/172.factorial-trailing-zeroes.py) - Math
|
|
- [189. Rotate Array](src/exercises/189.rotate-array.py) - Array, Math, Two Pointers
|
|
- [202. Happy Number](src/exercises/202.happy-number.py) - Hash Table, Math, Two Pointers
|
|
- [150. Evaluate Reverse Polish Notation](src/exercises/150.evaluate-reverse-polish-notation.py) - Array, Math, Stack
|
|
|
|
### 🧮 Bit Manipulation
|
|
- [89. Gray Code](src/exercises/89.gray-code.py) - Math, Backtracking, Bit Manipulation
|
|
- [90. Subsets II](src/exercises/90.subsets-ii.py) - Array, Backtracking, Bit Manipulation
|
|
|
|
### 🏗️ Design
|
|
- [155. Min Stack](src/exercises/155.min-stack.py) - Stack, Design
|
|
- [244. Shortest Word Distance II](src/exercises/244.shortest-word-distance-ii.py) - Array, Hash Table, Design, Two Pointers
|
|
|
|
### 🔗 Union Find
|
|
- [128. Longest Consecutive Sequence](src/exercises/128.longest-consecutive-sequence.py) - Array, Hash Table, Union Find
|
|
- [990. Satisfiability of Equality Equations](src/exercises/990.satisfiability-of-equality-equations.py) - Array, Union Find, Graph
|
|
|
|
### 📊 Sorting
|
|
- [15. 3Sum](src/exercises/15.3sum.py) - Array, Two Pointers, Sorting
|
|
- [80. Remove Duplicates from Sorted Array II](src/exercises/80.remove-duplicates-from-sorted-array-ii.py) - Array, Two Pointers
|
|
- [88. Merge Sorted Array](src/exercises/88.merge-sorted-array.py) - Array, Two Pointers
|
|
- [1200. Minimum Absolute Difference](src/exercises/1200.minimum-absolute-difference.py) - Array, Sorting
|
|
- [217. Contains Duplicate](src/exercises/217.contains-duplicate.py) - Array, Hash Table, Sorting
|
|
- [242. Valid Anagram](src/exercises/242.valid-anagram.py) - String, Sorting, Hash Table
|
|
- [2294. Partition Array Such That Maximum Difference Is K](src/exercises/2294.partition-array-such-that-maximum-difference-is-k.py) - Array, Greedy, Sorting
|
|
- [2966. Divide Array Into Arrays With Max Difference](src/exercises/2966.divide-array-into-arrays-with-max-difference.py) - Array, Greedy, Sorting
|
|
|
|
### 🔄 Recursion
|
|
- [2. Add Two Numbers](src/exercises/2.add-two-numbers.py) - Linked List, Math, Recursion
|
|
- [10. Regular Expression Matching](src/exercises/10.regular-expression-matching.py) - String, Dynamic Programming, Recursion
|
|
- [21. Merge Two Sorted Lists](src/exercises/21.merge-two-sorted-lists.py) - Linked List, Recursion
|
|
- [22. Generate Parentheses](src/exercises/22.generate-parentheses.py) - String, Dynamic Programming, Backtracking
|
|
- [50. Pow(x, n)](src/exercises/50.powx-n.py) - Math, Recursion
|
|
- [206. Reverse Linked List](src/exercises/206.reverse-linked-list.py) - Linked List, Recursion
|
|
- [248. Strobogrammatic Number III](src/exercises/248.strobogrammatic-number-iii.py) - Math, Recursion
|
|
|
|
### 🎯 Sliding Window
|
|
- [3. Longest Substring Without Repeating Characters](src/exercises/3.longest-substring-without-repeating-characters.py) - Hash Table, String, Sliding Window
|
|
- [219. Contains Duplicate II](src/exercises/219.contains-duplicate-ii.py) - Array, Hash Table, Sliding Window
|
|
|
|
### 📐 Geometry
|
|
- [149. Max Points on a Line](src/exercises/149.max-points-on-a-line.py) - Array, Hash Table, Math, Geometry
|
|
|
|
### 🔍 Divide and Conquer
|
|
- [4. Median of Two Sorted Arrays](src/exercises/4.median-of-two-sorted-arrays.py) - Array, Binary Search, Divide and Conquer
|
|
- [169. Majority Element](src/exercises/169.majority-element.py) - Array, Hash Table, Divide and Conquer
|
|
|
|
### 📝 String Manipulation
|
|
- [3. Longest Substring Without Repeating Characters](src/exercises/3.longest-substring-without-repeating-characters.py) - Hash Table, String, Sliding Window
|
|
- [5. Longest Palindromic Substring](src/exercises/5.longest-palindromic-substring.py) - String, Dynamic Programming
|
|
- [6. Zigzag Conversion](src/exercises/6.zigzag-conversion.py) - String
|
|
- [10. Regular Expression Matching](src/exercises/10.regular-expression-matching.py) - String, Dynamic Programming, Recursion
|
|
- [13. Roman to Integer](src/exercises/13.roman-to-integer.py) - Hash Table, Math, String
|
|
- [14. Longest Common Prefix](src/exercises/14.longest-common-prefix.py) - String, Trie
|
|
- [20. Valid Parentheses](src/exercises/20.valid-parentheses.py) - Stack, String
|
|
- [22. Generate Parentheses](src/exercises/22.generate-parentheses.py) - String, Dynamic Programming, Backtracking
|
|
- [28. Find the Index of the First Occurrence in a String](src/exercises/28.find-the-index-of-the-first-occurrence-in-a-string.py) - String, Two Pointers
|
|
- [125. Valid Palindrome](src/exercises/125.valid-palindrome.py) - String, Two Pointers
|
|
- [205. Isomorphic Strings](src/exercises/205.isomorphic-strings.py) - Hash Table, String
|
|
- [242. Valid Anagram](src/exercises/242.valid-anagram.py) - String, Sorting, Hash Table
|
|
- [246. Strobogrammatic Number](src/exercises/246.strobogrammatic-number.py) - Hash Table, Two Pointers, String
|
|
- [248. Strobogrammatic Number III](src/exercises/248.strobogrammatic-number-iii.py) - Math, Recursion
|
|
- [290. Word Pattern](src/exercises/290.word-pattern.py) - Hash Table, String
|
|
- [383. Ransom Note](src/exercises/383.ransom-note.py) - String, Hash Table, Counting
|
|
- [392. Is Subsequence](src/exercises/392.is-subsequence.py) - String, Two Pointers, Dynamic Programming
|
|
- [91. Decode Ways](src/exercises/91.decode-ways.py) - String, Dynamic Programming
|
|
- [2116. Check if a Parentheses String Can Be Valid](src/exercises/2116.check-if-a-parentheses-string-can-be-valid.py) - String, Stack, Greedy
|
|
|
|
### 📊 Matrix
|
|
- [36. Valid Sudoku](src/exercises/36.valid-sudoku.py) - Array, Hash Table, Matrix
|
|
- [74. Search a 2D Matrix](src/exercises/74.search-a-2d-matrix.py) - Array, Binary Search, Matrix
|
|
|
|
### 🔢 Counting
|
|
- [383. Ransom Note](src/exercises/383.ransom-note.py) - String, Hash Table, Counting
|
|
|
|
### 🌐 Breadth-First Search
|
|
- [1298. Maximum Candies You Can Get from Boxes](src/exercises/1298.maximum-candies-you-can-get-from-boxes.py) - Breadth-First Search, Array
|
|
|
|
## 📈 Progress Tracking
|
|
|
|
### Difficulty Distribution
|
|
- **Easy**: ~40 problems
|
|
- **Medium**: ~45 problems
|
|
- **Hard**: ~5 problems
|
|
|
|
### Top Problem Types
|
|
1. **Arrays & Strings** - Most common
|
|
2. **Hash Tables** - Frequently used technique
|
|
3. **Two Pointers** - Efficient array manipulation
|
|
4. **Binary Search** - Optimization problems
|
|
5. **Dynamic Programming** - Complex problem solving
|
|
|
|
## 🛠️ Solution Structure
|
|
|
|
Each solution follows a consistent structure:
|
|
- Standard library imports
|
|
- Type hints for better code clarity
|
|
- Solution class with required method
|
|
- Clean, readable implementation
|
|
- Proper comments and documentation
|
|
|
|
## 🎯 Learning Focus Areas
|
|
|
|
Based on the solutions, key areas of expertise include:
|
|
- **Array manipulation** and **two-pointer techniques**
|
|
- **Hash table** optimization for lookups
|
|
- **Binary search** for efficient searching
|
|
- **Dynamic programming** for complex problems
|
|
- **String manipulation** and **palindrome problems**
|
|
- **Linked list** operations and **cycle detection**
|
|
|
|
## 📚 Resources
|
|
|
|
- [LeetCode Problem Set](https://leetcode.com/problemset/)
|
|
- [LeetCode Profile](https://leetcode.com/u/cargdev/)
|
|
|
|
---
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*This index is automatically generated and organized by problem categories and difficulty levels. Each solution includes the relevant tags and techniques used.* |