DSA Problems and Solutions

Hitesh Kumar Yadav

Software Engineer

GitHub

GitHub

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Create 100. Same Tree.java

1004. Max Consecutive Ones III.java

102. Binary Tree Level Order Traversal.java

1020. Number of Enclaves.java

103. Binary Tree Zigzag Level Order Traversal.java

104. Maximum Depth of Binary Tree.java

1046. Last Stone Weight.java

1047. Remove All Adjacent Duplicates In String.java

1061. Lexicographically Smallest Equivalent String.java

1071. Greatest Common Divisor of Strings.java

1137. N-th Tribonacci Number.java

1161. Maximum Level Sum of a Binary Tree.java

1162. As Far from Land as Possible.java

118. Pascal's Triangle.java

122. Best Time to Buy and Sell Stock II.java

123. Best Time to Buy and Sell Stock III.java

1232. Check If It Is a Straight Line.java

1235. Maximum Profit in Job Scheduling.java

125. Valid Palindrome.java

1254. Number of Closed Islands.java

129. Sum Root to Leaf Numbers.java

13. Roman to Integer.java

131. Palindrome Partitioning.java

1318. Minimum Flips to Make a OR b Equal to c.java

April 9, 2023 00:08

January 7, 2023 23:54

1351. Count Negative Numbers in a Sorted Matrix.java

1353. Maximum Number of Events That Can Be Attended.java

January 2, 2023 22:43

137. Single Number II.java

1372. Longest ZigZag Path in a Binary Tree.java

August 4, 2023 23:52

1402. Reducing Dishes.java

141. Linked List Cycle.java

142. Linked List Cycle II.java

1431. Kids With the Greatest Number of Candies.java

144. Binary Tree Preorder Traversal.java

1443. Minimum Time to Collect All Apples in a Tree.java

Create 146. LRU Cache.java

1470. Shuffle the Array.java

January 9, 2023 00:00

1493. Longest Subarray of 1's After Deleting One Element.java

June 20, 2023 22:33

1502. Can Make Arithmetic Progression From Sequence.java

August 5, 2023 23:59

1514. Path with Maximum Probability.java

1519. Number of Nodes in the Sub-Tree With the Same Label.java

1523. Count Odd Numbers in an Interval Range.java

153. Find Minimum in Rotated Sorted Array.java

1539. Kth Missing Positive Number.java

1557. Minimum Number of Vertices to Reach All Nodes.java

1572. Matrix Diagonal Sum.java

1575. Count All Possible Routes.java

160. Intersection of Two Linked Lists.java

1601. Maximum Number of Achievable Transfer Requests.java

1603. Design Parking System.java

1630. Arithmetic Subarrays.java

1675. Minimize Deviation in Array.java

169. Majority Element.java

17. Letter Combinations of a Phone Number.java

1721. Swapping Nodes in a Linked List.java

1732. Find the Highest Altitude.java

1751. Maximum Number of Events That Can Be Attended II.java

1768. Merge Strings Alternately.java

1799. Maximize Score After N Operations.java

June 20, 2023 23:17

1822. Sign of the Product of an Array.java

1833. Maximum Ice Cream Bars.java

1834. Single-Threaded CPU.java

188. Best Time to Buy and Sell Stock IV.java

June 13, 2023 11:55

December 28, 2022 21:35

2. Add Two Numbers.java

20. Valid Parentheses.java

July 7, 2023 08:46

207. Course Schedule.java

209. Minimum Size Subarray Sum.java

2090. K Radius Subarray Averages.java

2101. Detonate the Maximum Bombs.java

2130. Maximum Twin Sum of a Linked List.java

2140. Solving Questions With Brainpower.java

215. Kth Largest Element in an Array.java

2187. Minimum Time to Complete Trips.java

2215. Find the Difference of Two Arrays.java

2220. Minimum Bit Flips to Convert Number.java

2244. Minimum Rounds to Complete All Tasks.java

2246. Longest Path With Different Adjacent Characters.java

225. Implement Stack using Queues.java

226. Invert Binary Tree.java

2279. Maximum Bags With Full Capacity of Rocks.java

228. Summary Ranges.java

229. Majority Element II.java

2300. Successful Pairs of Spells and Potions.java

2305. Fair Distribution of Cookies.java

2306. Naming a Company.java

2316. Count Unreachable Pairs of Nodes in an Undirected Graph.java

2328. Number of Increasing Paths in a Grid.java

2336. Smallest Number in Infinite Set.java

234. Palindrome Linked List.java

2348. Number of Zero-Filled Subarrays.java

2352. Equal Row and Column Pairs.java

March 27, 2023 01:18

2389. Longest Subsequence With Limited Sum.java

239. Sliding Window Maximum.java

2390. Removing Stars From a String.java

24. Swap Nodes in Pairs.java

240. Search a 2D Matrix II.java

2405. Optimal Partition of String.java

2439. Minimize Maximum of Array.java

2448. Minimum Cost to Make Array Equal.java

2462. Total Cost to Hire K Workers.java

2466. Count Ways To Build Good Strings.java

2492. Minimum Score of a Path Between Two Cities.java

2551. Put Marbles in Bags.java

April 27, 2023 00:50

268. Missing Number.java

279. Perfect Squares.java

287. Find the Duplicate Number.java

January 1, 2023 08:41

300. Longest Increasing Subsequence.java

31. Next Permutation.java

April 27, 2023 11:13

33. Search in Rotated Sorted Array.java

35. Search Insert Position.java

352. Data Stream as Disjoint Intervals.java

373. Find K Pairs with Smallest Sums.java

399. Evaluate Division.java

424. Longest Repeating Character Replacement.java

427. Construct Quad Tree.java

438. Find All Anagrams in a String.java

445. Add Two Numbers II.java

45. Jump Game II.java

452. Minimum Number of Arrows to Burst Balloons.java

454. 4Sum II.java

August 4, 2023 00:27

47. Permutations II.java

June 13, 2023 12:21

June 15, 2023 22:04

February 24, 2023 00:26

518. Coin Change II.java

520. Detect Capital.java

54. Spiral Matrix.java

August 18, 2023 00:19

547. Number of Provinces.java

December 26, 2022 21:13

56. Merge Intervals.java

560. Subarray Sum Equals K.java

567. Permutation in String.java

59. Spiral Matrix II.java

6. Zigzag Conversion.java

605. Can Place Flowers.java

December 31, 2022 22:18

63. Unique Paths II.java

64. Minimum Path Sum.java

February 14, 2023 23:44

680. Valid Palindrome II.java

688. Knight Probability in Chessboard.java

69. Sqrt(x).java

7. Reverse Integer.java

703. Kth Largest Element in a Stream.java

April 1, 2023 10:24

705. Design HashSet.java

706. Design HashMap.java

April 13, 2023 10:14

714. Best Time to Buy and Sell Stock with Transaction Fee.java

725. Split Linked List in Parts.java

73. Set Matrix Zeroes.java

735. Asteroid Collision.java

74. Search a 2D Matrix.java

744. Find Smallest Letter Greater Than Target.java

August 1, 2023 23:16

August 10, 2023 18:09

783. Minimum Distance Between BST Nodes.java

785. Is Graph Bipartite?.java

790. Domino and Tromino Tiling.java

797. All Paths From Source to Target.java

8. String to Integer (atoi).java

802. Find Eventual Safe States.java

844. Backspace String Compare.java

852. Peak Index in a Mountain Array.java

859. Buddy Strings.java

86. Partition List.java

863. All Nodes Distance K in Binary Tree.java

864. Shortest Path to Get All Keys.java

87. Scramble String.java

877. Stone Game.java

881. Boats to Save People.java

9. Palindrome Number.java

904. Fruit Into Baskets.java

909. Snakes and Ladders.java

918. Maximum Sum Circular Subarray.java

92. Reverse Linked List II.java

926. Flip String to Monotone Increasing.java

946. Validate Stack Sequences.java

953. Verifying an Alien Dictionary.java

956. Tallest Billboard.java

958. Check Completeness of a Binary Tree.java

974. Subarray Sums Divisible by K.java

980. Unique Paths III.java

983. Minimum Cost For Tickets.java

February 15, 2023 23:08

997. Find the Town Judge.java

Add 1 to a number represented as linked list.java

Best Time to Buy and Sell Stock with Cooldown.java

Best Time to Buy and Sell Stock.java

Binary Numbers.java

Binary Tree Inorder Traversal.java

Binary Tree Maximum Path Sum.java

December 17, 2022 14:09

Calculate XOR.java

Chocolate Distribution Problem.java

Climbing Stairs.java

Contains Duplicate.java

November 30, 2022 13:56

Daily Temperatures.java

Delete Node in a Linked List.java

August 25, 2023 12:00

September 29, 2022 19:56

Delete without head pointer.java

Detect Loop in linked list.java

Detect cycle in a directed graph.java

Detect cycle in an undirected graph.java

Evaluate Reverse Polish Notation.java

Fibonacci Number.java

Find if Path Exists in Graph.java

Find the Safe Position.java

Flattening a Linked List.java

Fractional Knapsac.java

Geek and Number String.java

Get Maze Path With Jumps.java

Get Maze Paths.java

Rename Get Stair Paths to Get Stair Paths.java

Get Subsequence.java

December 5, 2022 20:34

House Robber.java

Huffman Encoding.java

IPL 2021 - Match Day 2.java

Implement Queue using Stacks.java

Implementing Dijkstra Algorithm.java

December 7, 2022 12:07

Intersection of Two Arrays II.java

Intersection of two sorted Linked lists.java

December 28, 2022 11:14

Keys and Rooms.java

LCM And GCD.java

August 18, 2023 15:36

Leaf-Similar Trees.java

Level order traversal in spiral form.java

Longest Common Subsequence.java

Longest Subarray With Sum K(only positives).java

Longest Subarray With Sum K.java

Maximum Difference Between Node and Ancestor.java

Maximum Product of Splitted Binary Tree.java

Maximum Subarray.java

Merge Sort.java

Merge Sorted Array.java

Merge Two Sorted Lists.java

Merge Without Extra Space.java

Minimum Cost of ropes.java

Minimum Falling Path Sum.java

Minimum element in BST.java

December 3, 2022 18:39

Number of Coins.java

Odd Even Linked List.java

Pairwise swap elements of a linked list.java

Path Sum.java

Permutations of a given string.java

Possible Bipartition.java

Power Of Numbers.java

Print Maze Paths.java

Print Stair Paths.java

Print Subsequence.java

Quick Sort.java

Range Sum of BST.java

Remove Nth Node From End of List.java

Remove duplicates from an unsorted linked list.java

Reverse a Doubly Linked List.java

Reverse a linked list.java

August 5, 2023 23:34

Search Insert Position.java

Search a node in BST.java

Second Largest.java

Shop in Candy Store.java

Shortest path in Undirected Graph having unit distance.java

Stack Using Deque.java

Subarray with 0 sum.java

Subset Sum.java

Sum of Distances in Tree.java

Tom and Jerry.java

Topological sort.java

Tower Of Hanoi(GFG).java

Tower Of Hanoi(Pep Coding).java

Tree Inorder Traversal.java

Two Sum.java

Valid Parentheses.java

Validate Binary Search Tree.java

Ways To Tile A Floor.java

printKPC.java

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Posted Aug 27, 2023

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