LeetCode-Questions 🚀

Welcome to the Advanced Data Structure Concepts Repository! This repository is dedicated to providing a comprehensive collection of questions and concepts related to advanced data structures. Whether you're a student, educator, or professional seeking to deepen your understanding of data structures, this repository aims to be a valuable resource for you.

Recursion 🙂

No	Title	Solution	Difficulty
1	Combination Sum	Java	Medium
2	Combination Sum - II	Java	Medium
3	Palindrome Partitioning	Java	Medium
4	Subset Sums	Java	Medium
5	Subsets II	Java	Medium
6	Kth Permutation Sequence ❗️Doubt❗️	Java	Hard
7	Permutations	Java	Medium
8	N-Queens	Java	Hard
9	Sudoku Solver	Java	Hard
10	Rat in a Maze Problem - I	Java	Medium
11	Merge Sort	Java	Medium

Binary Search 🙂

No	Title	Solution	Difficulty
1	Find First and Last Position of Element in Sorted Array	Java	Medium
2	Search in Rotated Sorted Array	Java	Medium
3	Search in Rotated Sorted Array - II	Java	Medium
4	Find Minimum in Rotated Sorted Array	Java	Medium
5	How many times array has been rotated	Java	Easy
6	Single Element in a Sorted Array	Java	Medium
7	Sqrt(x)	Java	Easy
8	Find Nth root of M	Java	Easy
9	Koko Eating Bananas	Java	Medium
10	Minimum Number of Days to Make m Bouquets	Java	Medium
11	Find the Smallest Divisor Given a Threshold	Java	Medium
12	Capacity To Ship Packages Within D Days	Java	Medium
13	Kth Missing Positive Number	Java	Easy
14	Aggresive Cows	Java	Hard
15	Allocate minimum number of pages ❗️Doubt❗️	Java	Medium
16	Median of Two Sorted Arrays (Brute Froce)	Java	Hard
17	K-th element of two Arrays (Brute Froce)	Java	Medium
18	Row With Maximum 1's (Brute Froce)	Java	Easy
19	Search a 2D Matrix	Java	Medium
20	Search a 2D Matrix - II	Java	Medium

HashMap 🙂

No	Title	Solution	Difficulty
1	Two Sum	Java	Easy
2	3 Sum	Java	Medium
3	Longest Consecutive Sequence	Java	Medium
4	Largest subarray with 0 sum	Java	Medium
5	Longest Substring Without Repeating Characters	Java	Medium

Name		Name	Last commit message	Last commit date
Latest commit History 457 Commits
0001-two-sum		0001-two-sum
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0015-3sum		0015-3sum
0018-4sum		0018-4sum
0020-valid-parentheses		0020-valid-parentheses
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0037-sudoku-solver		0037-sudoku-solver
0039-combination-sum		0039-combination-sum
0040-combination-sum-ii		0040-combination-sum-ii
0046-permutations		0046-permutations
0050-powx-n		0050-powx-n
0051-n-queens		0051-n-queens
0056-merge-intervals		0056-merge-intervals
0058-length-of-last-word		0058-length-of-last-word
0060-permutation-sequence		0060-permutation-sequence
0062-unique-paths		0062-unique-paths
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0076-minimum-window-substring		0076-minimum-window-substring
0081-search-in-rotated-sorted-array-ii		0081-search-in-rotated-sorted-array-ii
0084-largest-rectangle-in-histogram		0084-largest-rectangle-in-histogram
0085-maximal-rectangle		0085-maximal-rectangle
0090-subsets-ii		0090-subsets-ii
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0131-palindrome-partitioning		0131-palindrome-partitioning
0148-sort-list		0148-sort-list
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0155-min-stack		0155-min-stack
0165-compare-version-numbers		0165-compare-version-numbers
0215-kth-largest-element-in-an-array		0215-kth-largest-element-in-an-array
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0232-implement-queue-using-stacks		0232-implement-queue-using-stacks
0239-sliding-window-maximum		0239-sliding-window-maximum
0240-search-a-2d-matrix-ii		0240-search-a-2d-matrix-ii
0268-missing-number		0268-missing-number
0273-integer-to-english-words		0273-integer-to-english-words
0349-intersection-of-two-arrays		0349-intersection-of-two-arrays
0386-lexicographical-numbers		0386-lexicographical-numbers
0402-remove-k-digits		0402-remove-k-digits
0409-longest-palindrome		0409-longest-palindrome
0496-next-greater-element-i		0496-next-greater-element-i
0503-next-greater-element-ii		0503-next-greater-element-ii
0506-relative-ranks		0506-relative-ranks
0540-single-element-in-a-sorted-array		0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k		0560-subarray-sum-equals-k
0567-permutation-in-string		0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists		0632-smallest-range-covering-elements-from-k-lists
0648-replace-words		0648-replace-words
0670-maximum-swap		0670-maximum-swap
0735-asteroid-collision		0735-asteroid-collision
0746-min-cost-climbing-stairs		0746-min-cost-climbing-stairs
0844-backspace-string-compare		0844-backspace-string-compare
0846-hand-of-straights		0846-hand-of-straights
0874-walking-robot-simulation		0874-walking-robot-simulation
0875-koko-eating-bananas		0875-koko-eating-bananas
0901-online-stock-span		0901-online-stock-span
0907-sum-of-subarray-minimums		0907-sum-of-subarray-minimums
0912-sort-an-array		0912-sort-an-array
0921-minimum-add-to-make-parentheses-valid		0921-minimum-add-to-make-parentheses-valid
0951-flip-equivalent-binary-trees		0951-flip-equivalent-binary-trees
0962-maximum-width-ramp		0962-maximum-width-ramp
1002-find-common-characters		1002-find-common-characters
1011-capacity-to-ship-packages-within-d-days		1011-capacity-to-ship-packages-within-d-days
1106-parsing-a-boolean-expression		1106-parsing-a-boolean-expression
1190-reverse-substrings-between-each-pair-of-parentheses		1190-reverse-substrings-between-each-pair-of-parentheses
1233-remove-sub-folders-from-the-filesystem		1233-remove-sub-folders-from-the-filesystem
1277-count-square-submatrices-with-all-ones		1277-count-square-submatrices-with-all-ones
1283-find-the-smallest-divisor-given-a-threshold		1283-find-the-smallest-divisor-given-a-threshold
1331-rank-transform-of-an-array		1331-rank-transform-of-an-array
1342-number-of-steps-to-reduce-a-number-to-zero		1342-number-of-steps-to-reduce-a-number-to-zero
1346-check-if-n-and-its-double-exist		1346-check-if-n-and-its-double-exist
1380-lucky-numbers-in-a-matrix		1380-lucky-numbers-in-a-matrix
1405-longest-happy-string		1405-longest-happy-string
1455-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence		1455-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1482-minimum-number-of-days-to-make-m-bouquets		1482-minimum-number-of-days-to-make-m-bouquets
1497-check-if-array-pairs-are-divisible-by-k		1497-check-if-array-pairs-are-divisible-by-k
1518-water-bottles		1518-water-bottles
1539-kth-missing-positive-number		1539-kth-missing-positive-number
1544-make-the-string-great		1544-make-the-string-great
1545-find-kth-bit-in-nth-binary-string		1545-find-kth-bit-in-nth-binary-string
1590-make-sum-divisible-by-p		1590-make-sum-divisible-by-p
1593-split-a-string-into-the-max-number-of-unique-substrings		1593-split-a-string-into-the-max-number-of-unique-substrings
1671-minimum-number-of-removals-to-make-mountain-array		1671-minimum-number-of-removals-to-make-mountain-array
1684-count-the-number-of-consistent-strings		1684-count-the-number-of-consistent-strings
1791-find-center-of-star-graph		1791-find-center-of-star-graph
1813-sentence-similarity-iii		1813-sentence-similarity-iii
1859-sorting-the-sentence		1859-sorting-the-sentence
1905-count-sub-islands		1905-count-sub-islands
1942-the-number-of-the-smallest-unoccupied-chair		1942-the-number-of-the-smallest-unoccupied-chair
1945-sum-of-digits-of-string-after-convert		1945-sum-of-digits-of-string-after-convert
1957-delete-characters-to-make-fancy-string		1957-delete-characters-to-make-fancy-string
1963-minimum-number-of-swaps-to-make-the-string-balanced		1963-minimum-number-of-swaps-to-make-the-string-balanced
2000-reverse-prefix-of-word		2000-reverse-prefix-of-word
2022-convert-1d-array-into-2d-array		2022-convert-1d-array-into-2d-array
2028-find-missing-observations		2028-find-missing-observations
2044-count-number-of-maximum-bitwise-or-subsets		2044-count-number-of-maximum-bitwise-or-subsets
2053-kth-distinct-string-in-an-array		2053-kth-distinct-string-in-an-array

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Recursion 🙂

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Contributions are welcome! Feel free to open a pull request if you have a better solution or want to add solutions for new problems..

Happy Coding 💛

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