LeetCode

• https://leetcode.com/u/727721euec087/

GeeksForGeeks

• https://www.geeksforgeeks.org/user/msanthoshhh/

LeetCode Topics

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0033-search-in-rotated-sorted-array
0035-search-insert-position
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0048-rotate-image
0049-group-anagrams
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0079-word-search
0085-maximal-rectangle
0088-merge-sorted-array
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0139-word-break
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0169-majority-element
0198-house-robber
0200-number-of-islands
0213-house-robber-ii
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0219-contains-duplicate-ii
0229-majority-element-ii
0238-product-of-array-except-self
0268-missing-number
0283-move-zeroes
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0322-coin-change
0330-patching-array
0334-increasing-triplet-subsequence
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0377-combination-sum-iv
0396-rotate-function
0485-max-consecutive-ones
0518-coin-change-ii
0540-single-element-in-a-sorted-array
0961-n-repeated-element-in-size-2n-array
1004-max-consecutive-ones-iii
1266-minimum-time-visiting-all-points
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1306-jump-game-iii
1356-sort-integers-by-the-number-of-1-bits
1390-four-divisors
1458-max-dot-product-of-two-subsequences
1548-check-if-all-1s-are-at-least-length-k-places-away
1582-special-positions-in-a-binary-matrix
1594-maximum-non-negative-product-in-a-matrix
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1975-maximum-matrix-sum
2244-number-of-laser-beams-in-a-bank
2274-keep-multiplying-found-values-by-two
2343-count-unguarded-cells-in-the-grid
2553-separate-the-digits-in-an-array
2784-check-if-array-is-good
2906-construct-product-matrix
2943-maximize-area-of-square-hole-in-grid
2946-matrix-similarity-after-cyclic-shifts
3314-construct-the-minimum-bitwise-array-i
3501-delete-nodes-from-linked-list-present-in-array
3546-equal-sum-grid-partition-i
3581-the-two-sneaky-numbers-of-digitville
3610-find-x-sum-of-all-k-long-subarrays-i

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0049-group-anagrams
0073-set-matrix-zeroes
0076-minimum-window-substring
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0133-clone-graph
0139-word-break
0141-linked-list-cycle
0169-majority-element
0205-isomorphic-strings
0217-contains-duplicate
0219-contains-duplicate-ii
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0387-first-unique-character-in-a-string
0389-find-the-difference
0424-longest-repeating-character-replacement
0865-smallest-subtree-with-all-the-deepest-nodes
0961-n-repeated-element-in-size-2n-array
2274-keep-multiplying-found-values-by-two
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii
3501-delete-nodes-from-linked-list-present-in-array
3581-the-two-sneaky-numbers-of-digitville
3610-find-x-sum-of-all-k-long-subarrays-i
3713-longest-balanced-substring-i

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0061-rotate-list
0141-linked-list-cycle
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0029-divide-two-integers
0043-multiply-strings
0048-rotate-image
0050-powx-n
0062-unique-paths
0066-plus-one
0070-climbing-stairs
0231-power-of-two
0268-missing-number
0279-perfect-squares
0326-power-of-three
0368-largest-divisible-subset
0371-sum-of-two-integers
0396-rotate-function
1013-fibonacci-number
1266-minimum-time-visiting-all-points
1390-four-divisors
1817-calculate-money-in-leetcode-bank
2244-number-of-laser-beams-in-a-bank
2946-matrix-similarity-after-cyclic-shifts
3581-the-two-sneaky-numbers-of-digitville
3676-smallest-number-with-all-set-bits

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0044-wildcard-matching
0050-powx-n
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0326-power-of-three
0394-decode-string
1013-fibonacci-number
1545-find-kth-bit-in-nth-binary-string

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0043-multiply-strings
0044-wildcard-matching
0049-group-anagrams
0058-length-of-last-word
0076-minimum-window-substring
0079-word-search
0115-distinct-subsequences
0139-word-break
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0297-serialize-and-deserialize-binary-tree
0344-reverse-string
0345-reverse-vowels-of-a-string
0387-first-unique-character-in-a-string
0389-find-the-difference
0392-is-subsequence
0394-decode-string
0424-longest-repeating-character-replacement
0449-serialize-and-deserialize-bst
0516-longest-palindromic-subsequence
0647-palindromic-substrings
0657-robot-return-to-origin
0712-minimum-ascii-delete-sum-for-two-strings
0796-rotate-string
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1545-find-kth-bit-in-nth-binary-string
1700-minimum-time-to-make-rope-colorful
1758-minimum-changes-to-make-alternating-binary-string
1784-check-if-binary-string-has-at-most-one-segment-of-ones
2244-number-of-laser-beams-in-a-bank
2833-furthest-point-from-origin
2839-check-if-strings-can-be-made-equal-with-operations-i
2840-check-if-strings-can-be-made-equal-with-operations-ii
3713-longest-balanced-substring-i

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0219-contains-duplicate-ii
0424-longest-repeating-character-replacement
1004-max-consecutive-ones-iii
3610-find-x-sum-of-all-k-long-subarrays-i

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0222-count-complete-tree-nodes
0268-missing-number
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0349-intersection-of-two-arrays
0540-single-element-in-a-sorted-array
1004-max-consecutive-ones-iii
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold

Divide and Conquer

0004-median-of-two-sorted-arrays
0053-maximum-subarray
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
0141-linked-list-cycle
0151-reverse-words-in-a-string
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0344-reverse-string
0345-reverse-vowels-of-a-string
0349-intersection-of-two-arrays
0392-is-subsequence
0647-palindromic-substrings

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0044-wildcard-matching
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0085-maximal-rectangle
0115-distinct-subsequences
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0124-binary-tree-maximum-path-sum
0139-word-break
0152-maximum-product-subarray
0198-house-robber
0213-house-robber-ii
0279-perfect-squares
0300-longest-increasing-subsequence
0322-coin-change
0338-counting-bits
0368-largest-divisible-subset
0377-combination-sum-iv
0392-is-subsequence
0396-rotate-function
0516-longest-palindromic-subsequence
0518-coin-change-ii
0647-palindromic-substrings
0712-minimum-ascii-delete-sum-for-two-strings
1013-fibonacci-number
1411-number-of-ways-to-paint-n-3-grid
1458-max-dot-product-of-two-subsequences
1594-maximum-non-negative-product-in-a-matrix
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful

Greedy

0011-container-with-most-water
0044-wildcard-matching
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0330-patching-array
0334-increasing-triplet-subsequence
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1975-maximum-matrix-sum

Trie

0014-longest-common-prefix
0139-word-break
0386-lexicographical-numbers

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0078-subsets
0079-word-search
0216-combination-sum-iii

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0796-rotate-string

Bit Manipulation

0029-divide-two-integers
0078-subsets
0190-reverse-bits
0191-number-of-1-bits
0201-bitwise-and-of-numbers-range
0222-count-complete-tree-nodes
0231-power-of-two
0268-missing-number
0287-find-the-duplicate-number
0338-counting-bits
0371-sum-of-two-integers
0389-find-the-difference
0476-number-complement
1356-sort-integers-by-the-number-of-1-bits
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
3314-construct-the-minimum-bitwise-array-i
3676-smallest-number-with-all-set-bits

Sorting

0015-3sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0169-majority-element
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0229-majority-element-ii
0242-valid-anagram
0268-missing-number
0347-top-k-frequent-elements
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0389-find-the-difference
1356-sort-integers-by-the-number-of-1-bits
2274-keep-multiplying-found-values-by-two
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii
2943-maximize-area-of-square-hole-in-grid

Matrix

0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0085-maximal-rectangle
0200-number-of-islands
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1582-special-positions-in-a-binary-matrix
1594-maximum-non-negative-product-in-a-matrix
1886-determine-whether-matrix-can-be-obtained-by-rotation
1895-largest-magic-square
1975-maximum-matrix-sum
2244-number-of-laser-beams-in-a-bank
2343-count-unguarded-cells-in-the-grid
2906-construct-product-matrix
2946-matrix-similarity-after-cyclic-shifts
3546-equal-sum-grid-partition-i

Memoization

0070-climbing-stairs
0139-word-break
1013-fibonacci-number

Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0124-binary-tree-maximum-path-sum
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0449-serialize-and-deserialize-bst
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0133-clone-graph
0200-number-of-islands
0226-invert-binary-tree
0279-perfect-squares
0297-serialize-and-deserialize-binary-tree
0322-coin-change
0449-serialize-and-deserialize-bst
0865-smallest-subtree-with-all-the-deepest-nodes
1161-maximum-level-sum-of-a-binary-tree
1306-jump-game-iii

Binary Tree

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0124-binary-tree-maximum-path-sum
0222-count-complete-tree-nodes
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0449-serialize-and-deserialize-bst
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1339-maximum-product-of-splitted-binary-tree

Binary Search Tree

0108-convert-sorted-array-to-binary-search-tree
0230-kth-smallest-element-in-a-bst
0449-serialize-and-deserialize-bst

Stack

0020-valid-parentheses
0042-trapping-rain-water
0085-maximal-rectangle
0234-palindrome-linked-list
0394-decode-string
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array

Monotonic Stack

0042-trapping-rain-water
0085-maximal-rectangle
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array

Simulation

0043-multiply-strings
0054-spiral-matrix
0059-spiral-matrix-ii
0657-robot-return-to-origin
1404-number-of-steps-to-reduce-a-number-in-binary-representation-to-one
1545-find-kth-bit-in-nth-binary-string
2274-keep-multiplying-found-values-by-two
2343-count-unguarded-cells-in-the-grid
2553-separate-the-digits-in-an-array
2946-matrix-similarity-after-cyclic-shifts

Combinatorics

0062-unique-paths

Depth-First Search

0079-word-search
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0124-binary-tree-maximum-path-sum
0133-clone-graph
0200-number-of-islands
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0297-serialize-and-deserialize-binary-tree
0386-lexicographical-numbers
0449-serialize-and-deserialize-bst
0865-smallest-subtree-with-all-the-deepest-nodes
1022-sum-of-root-to-leaf-binary-numbers
1161-maximum-level-sum-of-a-binary-tree
1306-jump-game-iii
1339-maximum-product-of-splitted-binary-tree

Counting

0169-majority-element
0229-majority-element-ii
0347-top-k-frequent-elements
0387-first-unique-character-in-a-string
1356-sort-integers-by-the-number-of-1-bits
2833-furthest-point-from-origin
3713-longest-balanced-substring-i

Graph

0133-clone-graph

Union Find

0200-number-of-islands

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
3610-find-x-sum-of-all-k-long-subarrays-i

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Prefix Sum

0238-product-of-array-except-self
1004-max-consecutive-ones-iii
1292-maximum-side-length-of-a-square-with-sum-less-than-or-equal-to-threshold
1895-largest-magic-square
2906-construct-product-matrix
3546-equal-sum-grid-partition-i

Queue

0387-first-unique-character-in-a-string

Bucket Sort

0347-top-k-frequent-elements

Geometry

1266-minimum-time-visiting-all-points

Enumeration

3546-equal-sum-grid-partition-i
3713-longest-balanced-substring-i

Graph Theory

0133-clone-graph

Design

0297-serialize-and-deserialize-binary-tree
0449-serialize-and-deserialize-bst

Union-Find

0200-number-of-islands