Data Structures and Algorithms (DSA)

A collection of Java solutions to Data Structures and Algorithms problems from LeetCode and Striver's A2Z DSA Sheet.

📌 About

This repository contains my solutions to a wide variety of DSA problems solved during my placement preparation. The primary goal is to strengthen problem-solving skills and build a strong foundation in algorithms and data structures.

🚀 Topics Covered

Arrays
Strings
Linked Lists
Stacks
Queues
HashMaps
Trees
Binary Search Trees
Heaps (Priority Queue)
Graphs
Greedy Algorithms
Dynamic Programming
Backtracking
Sliding Window
Two Pointers
Binary Search

💻 Language

Java

📚 Practice Platforms

LeetCode
Striver A2Z DSA Sheet

📂 Repository Structure

Each folder represents a problem and contains:

Java solution
Optimized approach
Time Complexity
Space Complexity (where applicable)

🎯 Purpose

Improve problem-solving skills
Prepare for Software Engineering interviews
Practice coding patterns
Build consistency in DSA

📈 Progress

✔️ Solving problems regularly and continuously updating this repository.

⭐ Feel free to explore the repository and provide suggestions!

Name		Name	Last commit message	Last commit date
Latest commit History 327 Commits
1-two-sum		1-two-sum
100-same-tree		100-same-tree
101-symmetric-tree		101-symmetric-tree
1013-fibonacci-number		1013-fibonacci-number
1014-k-closest-points-to-origin		1014-k-closest-points-to-origin
1019-squares-of-a-sorted-array		1019-squares-of-a-sorted-array
102-binary-tree-level-order-traversal		102-binary-tree-level-order-traversal
103-binary-tree-zigzag-level-order-traversal		103-binary-tree-zigzag-level-order-traversal
1034-subarrays-with-k-different-integers		1034-subarrays-with-k-different-integers
104-maximum-depth-of-binary-tree		104-maximum-depth-of-binary-tree
1056-capacity-to-ship-packages-within-d-days		1056-capacity-to-ship-packages-within-d-days
1071-binary-prefix-divisible-by-5		1071-binary-prefix-divisible-by-5
1078-remove-outermost-parentheses		1078-remove-outermost-parentheses
11-container-with-most-water		11-container-with-most-water
110-balanced-binary-tree		110-balanced-binary-tree
1127-last-stone-weight		1127-last-stone-weight
118-pascals-triangle		118-pascals-triangle
12-integer-to-roman		12-integer-to-roman
1203-print-in-order		1203-print-in-order
121-best-time-to-buy-and-sell-stock		121-best-time-to-buy-and-sell-stock
125-valid-palindrome		125-valid-palindrome
128-longest-consecutive-sequence		128-longest-consecutive-sequence
13-roman-to-integer		13-roman-to-integer
136-single-number		136-single-number
1370-count-number-of-nice-subarrays		1370-count-number-of-nice-subarrays
14-longest-common-prefix		14-longest-common-prefix
1408-find-the-smallest-divisor-given-a-threshold		1408-find-the-smallest-divisor-given-a-threshold
145-binary-tree-postorder-traversal		145-binary-tree-postorder-traversal
1460-number-of-substrings-containing-all-three-characters		1460-number-of-substrings-containing-all-three-characters
1463-the-k-weakest-rows-in-a-matrix		1463-the-k-weakest-rows-in-a-matrix
148-sort-list		148-sort-list
15-3sum		15-3sum
151-reverse-words-in-a-string		151-reverse-words-in-a-string
152-maximum-product-subarray		152-maximum-product-subarray
153-find-minimum-in-rotated-sorted-array		153-find-minimum-in-rotated-sorted-array
1538-maximum-points-you-can-obtain-from-cards		1538-maximum-points-you-can-obtain-from-cards
155-min-stack		155-min-stack
160-intersection-of-two-linked-lists		160-intersection-of-two-linked-lists
1605-minimum-number-of-days-to-make-m-bouquets		1605-minimum-number-of-days-to-make-m-bouquets
162-find-peak-element		162-find-peak-element
1646-kth-missing-positive-number		1646-kth-missing-positive-number
169-majority-element		169-majority-element
1762-furthest-building-you-can-reach		1762-furthest-building-you-can-reach
18-4sum		18-4sum
1878-check-if-array-is-sorted-and-rotated		1878-check-if-array-is-sorted-and-rotated
189-rotate-array		189-rotate-array
1966-frequency-of-the-most-frequent-element		1966-frequency-of-the-most-frequent-element
199-binary-tree-right-side-view		199-binary-tree-right-side-view
2-add-two-numbers		2-add-two-numbers
20-valid-parentheses		20-valid-parentheses
2032-largest-odd-number-in-string		2032-largest-odd-number-in-string
2047-find-a-peak-element-ii		2047-find-a-peak-element-ii
206-reverse-linked-list		206-reverse-linked-list
209-minimum-size-subarray-sum		209-minimum-size-subarray-sum
22-generate-parentheses		22-generate-parentheses
2216-delete-the-middle-node-of-a-linked-list		2216-delete-the-middle-node-of-a-linked-list
2227-sum-of-subarray-ranges		2227-sum-of-subarray-ranges
225-implement-stack-using-queues		225-implement-stack-using-queues
2271-rearrange-array-elements-by-sign		2271-rearrange-array-elements-by-sign
229-majority-element-ii		229-majority-element-ii
231-power-of-two		231-power-of-two
232-implement-queue-using-stacks		232-implement-queue-using-stacks
2323-minimum-bit-flips-to-convert-number		2323-minimum-bit-flips-to-convert-number
237-delete-node-in-a-linked-list		237-delete-node-in-a-linked-list
239-sliding-window-maximum		239-sliding-window-maximum
24-swap-nodes-in-pairs		24-swap-nodes-in-pairs
240-search-a-2d-matrix-ii		240-search-a-2d-matrix-ii
25-reverse-nodes-in-k-group		25-reverse-nodes-in-k-group
26-remove-duplicates-from-sorted-array		26-remove-duplicates-from-sorted-array
268-missing-number		268-missing-number
27-remove-element		27-remove-element
283-move-zeroes		283-move-zeroes
295-find-median-from-data-stream		295-find-median-from-data-stream
3-longest-substring-without-repeating-characters		3-longest-substring-without-repeating-characters
31-next-permutation		31-next-permutation
328-odd-even-linked-list		328-odd-even-linked-list
33-search-in-rotated-sorted-array		33-search-in-rotated-sorted-array
34-find-first-and-last-position-of-element-in-sorted-array		34-find-first-and-last-position-of-element-in-sorted-array
347-top-k-frequent-elements		347-top-k-frequent-elements
35-search-insert-position		35-search-insert-position
367-valid-perfect-square		367-valid-perfect-square
378-kth-smallest-element-in-a-sorted-matrix		378-kth-smallest-element-in-a-sorted-matrix
3952-trionic-array-i		3952-trionic-array-i
4-median-of-two-sorted-arrays		4-median-of-two-sorted-arrays
402-remove-k-digits		402-remove-k-digits
410-split-array-largest-sum		410-split-array-largest-sum
424-longest-repeating-character-replacement		424-longest-repeating-character-replacement
451-sort-characters-by-frequency		451-sort-characters-by-frequency
48-rotate-image		48-rotate-image
485-max-consecutive-ones		485-max-consecutive-ones
493-reverse-pairs		493-reverse-pairs
496-next-greater-element-i		496-next-greater-element-i
5-longest-palindromic-substring		5-longest-palindromic-substring
50-powx-n		50-powx-n
53-maximum-subarray		53-maximum-subarray
54-spiral-matrix		54-spiral-matrix
540-single-element-in-a-sorted-array		540-single-element-in-a-sorted-array
543-diameter-of-binary-tree		543-diameter-of-binary-tree
56-merge-intervals		56-merge-intervals
560-subarray-sum-equals-k		560-subarray-sum-equals-k

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Repository files navigation

Data Structures and Algorithms (DSA)

📌 About

🚀 Topics Covered

💻 Language

📚 Practice Platforms

📂 Repository Structure

🎯 Purpose

📈 Progress

About

Uh oh!

Releases

Packages

Uh oh!

Contributors

Uh oh!

Languages

Folders and files

Latest commit

History

Repository files navigation

Data Structures and Algorithms (DSA)

📌 About

🚀 Topics Covered

💻 Language

📚 Practice Platforms

📂 Repository Structure

🎯 Purpose

📈 Progress

About

Topics

Resources

License

Uh oh!

Stars

Watchers

Forks

Releases

Packages 0

Uh oh!

Contributors

Uh oh!

Languages

Packages