Leetcode Solutions

Hello, I'm DOA'A OSAMA KHALAF, a skilled problem solver! Until February 22, 2024, I have solved more than 250 questions on LeetCode. In this repository, I attach my solutions along with explanations on how to solve them to contribute to the public knowledge. Join me in exploring these solutions and let's embark on the journey of problem-solving together!

Name		Name	Last commit message	Last commit date
Latest commit History 578 Commits
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0006-zigzag-conversion		0006-zigzag-conversion
0007-reverse-integer		0007-reverse-integer
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0010-regular-expression-matching		0010-regular-expression-matching
0011-container-with-most-water		0011-container-with-most-water
0012-integer-to-roman		0012-integer-to-roman
0014-longest-common-prefix		0014-longest-common-prefix
0015-3sum		0015-3sum
0016-3sum-closest		0016-3sum-closest
0017-letter-combinations-of-a-phone-number		0017-letter-combinations-of-a-phone-number
0018-4sum		0018-4sum
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0022-generate-parentheses		0022-generate-parentheses
0023-merge-k-sorted-lists		0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group		0025-reverse-nodes-in-k-group
0027-remove-element		0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0029-divide-two-integers		0029-divide-two-integers
0030-substring-with-concatenation-of-all-words		0030-substring-with-concatenation-of-all-words
0031-next-permutation		0031-next-permutation
0032-longest-valid-parentheses		0032-longest-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
0035-search-insert-position		0035-search-insert-position
0036-valid-sudoku		0036-valid-sudoku
0037-sudoku-solver		0037-sudoku-solver
0038-count-and-say		0038-count-and-say
0039-combination-sum		0039-combination-sum
0040-combination-sum-ii		0040-combination-sum-ii
0041-first-missing-positive		0041-first-missing-positive
0042-trapping-rain-water		0042-trapping-rain-water
0043-multiply-strings		0043-multiply-strings
0044-wildcard-matching		0044-wildcard-matching
0045-jump-game-ii		0045-jump-game-ii
0046-permutations		0046-permutations
0047-permutations-ii		0047-permutations-ii
0048-rotate-image		0048-rotate-image
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0051-n-queens		0051-n-queens
0052-n-queens-ii		0052-n-queens-ii
0053-maximum-subarray		0053-maximum-subarray
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0057-insert-interval		0057-insert-interval
0058-length-of-last-word		0058-length-of-last-word
0060-permutation-sequence		0060-permutation-sequence
0061-rotate-list		0061-rotate-list
0062-unique-paths		0062-unique-paths
0066-plus-one		0066-plus-one
0067-add-binary		0067-add-binary
0068-text-justification		0068-text-justification
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0076-minimum-window-substring		0076-minimum-window-substring
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0088-merge-sorted-array		0088-merge-sorted-array
0089-gray-code		0089-gray-code
0091-decode-ways		0091-decode-ways
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0097-interleaving-string		0097-interleaving-string
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0099-recover-binary-search-tree		0099-recover-binary-search-tree
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree		0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree		0110-balanced-binary-tree
0112-path-sum		0112-path-sum
0118-pascals-triangle		0118-pascals-triangle
0119-pascals-triangle-ii		0119-pascals-triangle-ii
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0125-valid-palindrome		0125-valid-palindrome
0136-single-number		0136-single-number
0141-linked-list-cycle		0141-linked-list-cycle
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0150-evaluate-reverse-polish-notation		0150-evaluate-reverse-polish-notation
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0169-majority-element		0169-majority-element
0171-excel-sheet-column-number		0171-excel-sheet-column-number
0189-rotate-array		0189-rotate-array
0190-reverse-bits		0190-reverse-bits
0191-number-of-1-bits		0191-number-of-1-bits
0201-bitwise-and-of-numbers-range		0201-bitwise-and-of-numbers-range
0202-happy-number		0202-happy-number
0205-isomorphic-strings		0205-isomorphic-strings
0206-reverse-linked-list		0206-reverse-linked-list
0217-contains-duplicate		0217-contains-duplicate
0219-contains-duplicate-ii		0219-contains-duplicate-ii
0222-count-complete-tree-nodes		0222-count-complete-tree-nodes
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0228-summary-ranges		0228-summary-ranges
0231-power-of-two		0231-power-of-two
0232-implement-queue-using-stacks		0232-implement-queue-using-stacks

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