GitHub - Sadiyashaikh15/DSA

📘 DSA – LeetCode & GFG Solutions

A collection of my Python solutions for LeetCode and GFG problems. This repo tracks my DSA practice, covering arrays, strings, hashing, sliding window, recursion, DP, trees, graphs, and more.

🚀 About

120+ LeetCode problems solved

Includes GFG questions (Python)

Optimized solutions with time & space complexity

Clean code + pattern-based approaches

📂 Topics Covered

Arrays & Strings

HashMap / HashSet

Two Pointers & Sliding Window

Binary Search

Recursion & Backtracking

Linked List / Trees / Graphs

Dynamic Programming

Greedy Algorithms

🎯 Goal Improve problem-solving skills and prepare for coding interviews.

⭐ If you find this useful, give the repo a star!

Name		Name	Last commit message	Last commit date
Latest commit History 214 Commits
1-two-sum		1-two-sum
100-same-tree		100-same-tree
108-convert-sorted-array-to-binary-search-tree		108-convert-sorted-array-to-binary-search-tree
11-container-with-most-water		11-container-with-most-water
110-balanced-binary-tree		110-balanced-binary-tree
12-integer-to-roman		12-integer-to-roman
121-best-time-to-buy-and-sell-stock		121-best-time-to-buy-and-sell-stock
122-best-time-to-buy-and-sell-stock-ii		122-best-time-to-buy-and-sell-stock-ii
125-valid-palindrome		125-valid-palindrome
13-roman-to-integer		13-roman-to-integer
134-gas-station		134-gas-station
135-candy		135-candy
136-single-number		136-single-number
14-longest-common-prefix		14-longest-common-prefix
1426-find-n-unique-integers-sum-up-to-zero		1426-find-n-unique-integers-sum-up-to-zero
1440-convert-integer-to-the-sum-of-two-no-zero-integers		1440-convert-integer-to-the-sum-of-two-no-zero-integers
1509-replace-employee-id-with-the-unique-identifier		1509-replace-employee-id-with-the-unique-identifier
151-reverse-words-in-a-string		151-reverse-words-in-a-string
16-3sum-closest		16-3sum-closest
1612-avoid-flood-in-the-city		1612-avoid-flood-in-the-city
1642-water-bottles		1642-water-bottles
1658-minimum-swaps-to-arrange-a-binary-grid		1658-minimum-swaps-to-arrange-a-binary-grid
168-excel-sheet-column-title		168-excel-sheet-column-title
169-majority-element		169-majority-element
17-letter-combinations-of-a-phone-number		17-letter-combinations-of-a-phone-number
1756-minimum-deletions-to-make-string-balanced		1756-minimum-deletions-to-make-string-balanced
18-4sum		18-4sum
1807-partitioning-into-minimum-number-of-deci-binary-numbers		1807-partitioning-into-minimum-number-of-deci-binary-numbers
1827-invalid-tweets		1827-invalid-tweets
189-rotate-array		189-rotate-array
190-reverse-bits		190-reverse-bits
1908-recyclable-and-low-fat-products		1908-recyclable-and-low-fat-products
20-valid-parentheses		20-valid-parentheses
217-contains-duplicate		217-contains-duplicate
219-contains-duplicate-ii		219-contains-duplicate-ii
22-generate-parentheses		22-generate-parentheses
2263-maximum-running-time-of-n-computers		2263-maximum-running-time-of-n-computers
228-summary-ranges		228-summary-ranges
23-merge-k-sorted-lists		23-merge-k-sorted-lists
2317-count-collisions-on-a-road		2317-count-collisions-on-a-road
238-product-of-array-except-self		238-product-of-array-except-self
2392-successful-pairs-of-spells-and-potions		2392-successful-pairs-of-spells-and-potions
24-swap-nodes-in-pairs		24-swap-nodes-in-pairs
242-valid-anagram		242-valid-anagram
26-remove-duplicates-from-sorted-array		26-remove-duplicates-from-sorted-array
2661-smallest-missing-non-negative-integer-after-operations		2661-smallest-missing-non-negative-integer-after-operations
268-missing-number		268-missing-number
27-remove-element		27-remove-element
274-h-index		274-h-index
28-find-the-index-of-the-first-occurrence-in-a-string		28-find-the-index-of-the-first-occurrence-in-a-string
283-move-zeroes		283-move-zeroes
29-divide-two-integers		29-divide-two-integers
3-longest-substring-without-repeating-characters		3-longest-substring-without-repeating-characters
303-range-sum-query-immutable		303-range-sum-query-immutable
3263-divide-an-array-into-subarrays-with-minimum-cost-i		3263-divide-an-array-into-subarrays-with-minimum-cost-i
3336-water-bottles-ii		3336-water-bottles-ii
34-find-first-and-last-position-of-element-in-sorted-array		34-find-first-and-last-position-of-element-in-sorted-array
3501-delete-nodes-from-linked-list-present-in-array		3501-delete-nodes-from-linked-list-present-in-array
3676-smallest-number-with-all-set-bits		3676-smallest-number-with-all-set-bits
37-sudoku-solver		37-sudoku-solver
3744-minimum-operations-to-make-array-elements-zero		3744-minimum-operations-to-make-array-elements-zero
38-count-and-say		38-count-and-say
380-insert-delete-getrandom-o1		380-insert-delete-getrandom-o1
3863-power-grid-maintenance		3863-power-grid-maintenance
3886-count-number-of-trapezoids-i		3886-count-number-of-trapezoids-i
39-combination-sum		39-combination-sum
3952-trionic-array-i		3952-trionic-array-i
3958-minimum-removals-to-balance-array		3958-minimum-removals-to-balance-array
4055-longest-balanced-substring-i		4055-longest-balanced-substring-i
407-trapping-rain-water-ii		407-trapping-rain-water-ii
417-pacific-atlantic-water-flow		417-pacific-atlantic-water-flow
42-trapping-rain-water		42-trapping-rain-water
45-jump-game-ii		45-jump-game-ii
46-permutations		46-permutations
51-n-queens		51-n-queens
53-maximum-subarray		53-maximum-subarray
55-jump-game		55-jump-game
58-length-of-last-word		58-length-of-last-word
584-find-customer-referee		584-find-customer-referee
59-spiral-matrix-ii		59-spiral-matrix-ii
595-big-countries		595-big-countries
6-zigzag-conversion		6-zigzag-conversion
64-minimum-path-sum		64-minimum-path-sum
67-add-binary		67-add-binary
70-climbing-stairs		70-climbing-stairs
794-swim-in-rising-water		794-swim-in-rising-water
80-remove-duplicates-from-sorted-array-ii		80-remove-duplicates-from-sorted-array-ii
83-remove-duplicates-from-sorted-list		83-remove-duplicates-from-sorted-list
88-merge-sorted-array		88-merge-sorted-array
94-binary-tree-inorder-traversal		94-binary-tree-inorder-traversal
Unknown		Unknown
README.md		README.md
ReverseArray.py		ReverseArray.py

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