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LeetCode Topics

String

0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0010-regular-expression-matching
0012-integer-to-roman
0017-letter-combinations-of-a-phone-number
0067-add-binary
0165-compare-version-numbers
0171-excel-sheet-column-number
0214-shortest-palindrome
0241-different-ways-to-add-parentheses
0242-valid-anagram
0344-reverse-string
0392-is-subsequence
0409-longest-palindrome
0412-fizz-buzz
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0812-rotate-string
0920-uncommon-words-from-two-sentences
0952-word-subsets
1044-find-common-characters
1112-find-words-that-can-be-formed-by-characters
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1460-number-of-substrings-containing-all-three-characters
1524-string-matching-in-an-array
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1786-count-the-number-of-consistent-strings
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1923-sentence-similarity-iii
2059-unique-length-3-palindromic-subsequences
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2300-construct-string-with-repeat-limit
2414-move-pieces-to-obtain-a-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2465-shifting-letters-ii
2502-sort-the-people
2580-circular-sentence
2599-take-k-of-each-character-from-left-and-right
2800-minimum-string-length-after-removing-substrings
3018-make-string-a-subsequence-using-cyclic-increments
3309-count-prefix-and-suffix-pairs-i
3379-score-of-a-string
3447-clear-digits

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0141-linked-list-cycle
0206-reverse-linked-list
0859-design-circular-deque
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list

Math

0002-add-two-numbers
0012-integer-to-roman
0067-add-binary
0069-sqrtx
0070-climbing-stairs
0171-excel-sheet-column-number
0202-happy-number
0231-power-of-two
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0412-fizz-buzz
0564-find-the-closest-palindrome
0592-fraction-addition-and-subtraction
0633-sum-of-square-numbers
0650-2-keys-keyboard
1240-stone-game-ii
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
1951-find-the-winner-of-the-circular-game
2649-count-total-number-of-colored-cells
2802-find-the-punishment-number-of-an-integer
2903-insert-greatest-common-divisors-in-linked-list
2998-count-symmetric-integers
3555-final-array-state-after-k-multiplication-operations-i

Recursion

0002-add-two-numbers
0010-regular-expression-matching
0021-merge-two-sorted-lists
0206-reverse-linked-list
0231-power-of-two
0241-different-ways-to-add-parentheses
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0018-4sum
0141-linked-list-cycle
0165-compare-version-numbers
0202-happy-number
0344-reverse-string
0349-intersection-of-two-arrays
0392-is-subsequence
0567-permutation-in-string
0633-sum-of-square-numbers
0719-find-k-th-smallest-pair-distance
1468-check-if-n-and-its-double-exist
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1923-sentence-similarity-iii
1972-rotating-the-box
2095-minimum-number-of-swaps-to-make-the-string-balanced
2232-adding-spaces-to-a-string
2265-partition-array-according-to-given-pivot
2414-move-pieces-to-obtain-a-string
2488-divide-intervals-into-minimum-number-of-groups
2524-largest-positive-integer-that-exists-with-its-negative
2551-apply-operations-to-an-array
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3018-make-string-a-subsequence-using-cyclic-increments

Dynamic Programming

0005-longest-palindromic-substring
0010-regular-expression-matching
0070-climbing-stairs
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0392-is-subsequence
0650-2-keys-keyboard
1025-minimum-cost-for-tickets
1170-shortest-common-supersequence
1196-filling-bookcase-shelves
1240-stone-game-ii
1631-number-of-sub-arrays-with-odd-sum
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
2067-maximum-number-of-points-with-cost
2562-count-ways-to-build-good-strings
2794-maximum-number-of-moves-in-a-grid

Tree

0112-path-sum
0515-find-largest-value-in-each-tree-row
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1116-maximum-level-sum-of-a-binary-tree
1387-find-elements-in-a-contaminated-binary-tree
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-a-tree
2646-kth-largest-sum-in-a-binary-tree

Design

0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
1387-find-elements-in-a-contaminated-binary-tree
1497-design-a-stack-with-increment-operation
2434-design-a-number-container-system

Binary Search Tree

0004-median-of-two-sorted-arrays
0069-sqrtx
0349-intersection-of-two-arrays
0633-sum-of-square-numbers
0719-find-k-th-smallest-pair-distance
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0892-shortest-subarray-with-sum-at-least-k
1335-maximum-candies-allocated-to-k-children
1468-check-if-n-and-its-double-exist
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1730-special-array-with-x-elements-greater-than-or-equal-x
1766-minimum-number-of-removals-to-make-mountain-array
1886-minimum-limit-of-balls-in-a-bag
2614-maximum-count-of-positive-integer-and-negative-integer
2640-maximum-number-of-integers-to-choose-from-a-range-i
2699-count-the-number-of-fair-pairs

Heap (Priority Queue)

0264-ugly-number-ii
0506-relative-ranks
0789-kth-largest-element-in-a-stream
0892-shortest-subarray-with-sum-at-least-k
1304-longest-happy-string
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2300-construct-string-with-repeat-limit
2375-minimum-obstacle-removal-to-reach-corner
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2692-take-gifts-from-the-richest-pile
2868-continuous-subarrays
3332-minimum-operations-to-exceed-threshold-value-ii
3555-final-array-state-after-k-multiplication-operations-i

Binary Tree

0112-path-sum
0515-find-largest-value-in-each-tree-row
0789-kth-largest-element-in-a-stream
0988-flip-equivalent-binary-trees
1116-maximum-level-sum-of-a-binary-tree
1387-find-elements-in-a-contaminated-binary-tree
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree

Data Stream

0789-kth-largest-element-in-a-stream

Array

0004-median-of-two-sorted-arrays
0011-container-with-most-water
0015-3sum
0016-3sum-closest
0018-4sum
0136-single-number
0169-majority-element
0217-contains-duplicate
0349-intersection-of-two-arrays
0506-relative-ranks
0624-maximum-distance-in-arrays
0719-find-k-th-smallest-pair-distance
0731-my-calendar-ii
0780-max-chunks-to-make-sorted
0859-design-circular-deque
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0906-walking-robot-simulation
0952-word-subsets
1002-maximum-width-ramp
1025-minimum-cost-for-tickets
1044-find-common-characters
1112-find-words-that-can-be-formed-by-characters
1147-flip-columns-for-maximum-number-of-equal-rows
1196-filling-bookcase-shelves
1240-stone-game-ii
1256-rank-transform-of-an-array
1335-maximum-candies-allocated-to-k-children
1396-count-servers-that-communicate
1468-check-if-n-and-its-double-exist
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1497-design-a-stack-with-increment-operation
1524-string-matching-in-an-array
1570-final-prices-with-a-special-discount-in-a-shop
1631-number-of-sub-arrays-with-odd-sum
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1694-make-sum-divisible-by-p
1730-special-array-with-x-elements-greater-than-or-equal-x
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1849-maximum-absolute-sum-of-any-subarray
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1923-sentence-similarity-iii
1927-maximum-ascending-subarray-sum
1940-maximum-xor-for-each-query
1951-find-the-winner-of-the-circular-game
1972-rotating-the-box
2067-maximum-number-of-points-with-cost
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2145-grid-game
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2232-adding-spaces-to-a-string
2265-partition-array-according-to-given-pivot
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2358-number-of-ways-to-split-array
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2465-shifting-letters-ii
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2524-largest-positive-integer-that-exists-with-its-negative
2551-apply-operations-to-an-array
2552-maximum-sum-of-distinct-subarrays-with-length-k
2564-most-profitable-path-in-a-tree
2614-maximum-count-of-positive-integer-and-negative-integer
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i
2692-take-gifts-from-the-richest-pile
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2764-maximum-number-of-fish-in-a-grid
2794-maximum-number-of-moves-in-a-grid
2868-continuous-subarrays
3309-count-prefix-and-suffix-pairs-i
3332-minimum-operations-to-exceed-threshold-value-ii
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i
3555-final-array-state-after-k-multiplication-operations-i

Sorting

0015-3sum
0016-3sum-closest
0018-4sum
0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0349-intersection-of-two-arrays
0506-relative-ranks
0719-find-k-th-smallest-pair-distance
0780-max-chunks-to-make-sorted
1256-rank-transform-of-an-array
1468-check-if-n-and-its-double-exist
1730-special-array-with-x-elements-greater-than-or-equal-x
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2502-sort-the-people
2524-largest-positive-integer-that-exists-with-its-negative
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2699-count-the-number-of-fair-pairs

Hash Table

0012-integer-to-roman
0017-letter-combinations-of-a-phone-number
0141-linked-list-cycle
0169-majority-element
0202-happy-number
0217-contains-duplicate
0242-valid-anagram
0264-ugly-number-ii
0349-intersection-of-two-arrays
0409-longest-palindrome
0567-permutation-in-string
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0952-word-subsets
1044-find-common-characters
1112-find-words-that-can-be-formed-by-characters
1147-flip-columns-for-maximum-number-of-equal-rows
1160-letter-tile-possibilities
1256-rank-transform-of-an-array
1387-find-elements-in-a-contaminated-binary-tree
1460-number-of-substrings-containing-all-three-characters
1468-check-if-n-and-its-double-exist
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2502-sort-the-people
2524-largest-positive-integer-that-exists-with-its-negative
2552-maximum-sum-of-distinct-subarrays-with-length-k
2599-take-k-of-each-character-from-left-and-right
2640-maximum-number-of-integers-to-choose-from-a-range-i
2707-merge-two-2d-arrays-by-summing-values
3434-find-the-number-of-distinct-colors-among-the-balls

Greedy

0011-container-with-most-water
0409-longest-palindrome
0624-maximum-distance-in-arrays
0780-max-chunks-to-make-sorted
0890-lemonade-change
1304-longest-happy-string
1766-minimum-number-of-removals-to-make-mountain-array
2089-maximum-matrix-sum
2095-minimum-number-of-swaps-to-make-the-string-balanced
2300-construct-string-with-repeat-limit
2488-divide-intervals-into-minimum-number-of-groups
2509-minimize-xor
2616-maximal-score-after-applying-k-operations
2640-maximum-number-of-integers-to-choose-from-a-range-i

Bit Manipulation

0067-add-binary
0136-single-number
0231-power-of-two
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
2059-unique-length-3-palindromic-subsequences
2308-divide-array-into-equal-pairs
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2509-minimize-xor
3394-minimum-array-end
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Divide and Conquer

0004-median-of-two-sorted-arrays
0169-majority-element

Counting

0169-majority-element
0920-uncommon-words-from-two-sentences
1112-find-words-that-can-be-formed-by-characters
1160-letter-tile-possibilities
1396-count-servers-that-communicate
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2163-kth-distinct-string-in-an-array
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2614-maximum-count-of-positive-integer-and-negative-integer

Simulation

0067-add-binary
0412-fizz-buzz
0592-fraction-addition-and-subtraction
0906-walking-robot-simulation
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2132-convert-1d-array-into-2d-array
2232-adding-spaces-to-a-string
2265-partition-array-according-to-given-pivot
2411-spiral-matrix-iv
2551-apply-operations-to-an-array
2692-take-gifts-from-the-richest-pile
2800-minimum-string-length-after-removing-substrings
3332-minimum-operations-to-exceed-threshold-value-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i

Depth-First Search

0112-path-sum
0515-find-largest-value-in-each-tree-row
0988-flip-equivalent-binary-trees
1116-maximum-level-sum-of-a-binary-tree
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
2201-valid-arrangement-of-pairs
2493-reverse-odd-levels-of-binary-tree
2564-most-profitable-path-in-a-tree
2764-maximum-number-of-fish-in-a-grid

Breadth-First Search

0112-path-sum
0515-find-largest-value-in-each-tree-row
1116-maximum-level-sum-of-a-binary-tree
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1876-map-of-highest-peak
2375-minimum-obstacle-removal-to-reach-corner
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2564-most-profitable-path-in-a-tree
2646-kth-largest-sum-in-a-binary-tree
2764-maximum-number-of-fish-in-a-grid

Trie

0440-k-th-smallest-in-lexicographical-order
3309-count-prefix-and-suffix-pairs-i

Matrix

1147-flip-columns-for-maximum-number-of-equal-rows
1396-count-servers-that-communicate
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1876-map-of-highest-peak
1972-rotating-the-box
2067-maximum-number-of-points-with-cost
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2145-grid-game
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2764-maximum-number-of-fish-in-a-grid
2794-maximum-number-of-moves-in-a-grid

Segment Tree

0731-my-calendar-ii

Prefix Sum

0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
1240-stone-game-ii
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2358-number-of-ways-to-split-array
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Ordered Set

0731-my-calendar-ii
2434-design-a-number-container-system
2868-continuous-subarrays

Rolling Hash

0214-shortest-palindrome
3309-count-prefix-and-suffix-pairs-i

String Matching

0214-shortest-palindrome
0812-rotate-string
1524-string-matching-in-an-array
3309-count-prefix-and-suffix-pairs-i

Hash Function

0214-shortest-palindrome
3309-count-prefix-and-suffix-pairs-i

Stack

0780-max-chunks-to-make-sorted
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1497-design-a-stack-with-increment-operation
1570-final-prices-with-a-special-discount-in-a-shop
1679-shortest-subarray-to-be-removed-to-make-array-sorted
2095-minimum-number-of-swaps-to-make-the-string-balanced
2800-minimum-string-length-after-removing-substrings
3447-clear-digits

Sliding Window

0567-permutation-in-string
0892-shortest-subarray-with-sum-at-least-k
1460-number-of-substrings-containing-all-three-characters
1755-defuse-the-bomb
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2552-maximum-sum-of-distinct-subarrays-with-length-k
2599-take-k-of-each-character-from-left-and-right
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i

Memoization

0070-climbing-stairs
0241-different-ways-to-add-parentheses

Backtracking

0017-letter-combinations-of-a-phone-number
1160-letter-tile-possibilities
1715-split-a-string-into-the-max-number-of-unique-substrings
2802-find-the-punishment-number-of-an-integer

Number Theory

2903-insert-greatest-common-divisors-in-linked-list

Monotonic Stack

0780-max-chunks-to-make-sorted
1002-maximum-width-ramp
1570-final-prices-with-a-special-discount-in-a-shop
1679-shortest-subarray-to-be-removed-to-make-array-sorted

Queue

0859-design-circular-deque
0892-shortest-subarray-with-sum-at-least-k
1951-find-the-winner-of-the-circular-game
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Monotonic Queue

0892-shortest-subarray-with-sum-at-least-k
2868-continuous-subarrays

Graph

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2201-valid-arrangement-of-pairs
2220-find-all-possible-recipes-from-given-supplies
2375-minimum-obstacle-removal-to-reach-corner
2564-most-profitable-path-in-a-tree

Shortest Path

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2375-minimum-obstacle-removal-to-reach-corner

Eulerian Circuit

2201-valid-arrangement-of-pairs

Game Theory

1240-stone-game-ii

Union Find

1396-count-servers-that-communicate
2764-maximum-number-of-fish-in-a-grid

Topological Sort

2220-find-all-possible-recipes-from-given-supplies

Enumeration

2998-count-symmetric-integers