leetcode_solution

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

See more about solutions at my Notion

LeetCode Topics

Array

Problem Name	Difficulty
0001-two-sum
0011-container-with-most-water
0015-3sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0035-search-insert-position
0036-valid-sudoku
0039-combination-sum	undefined
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations	undefined
0051-n-queens	undefined
0053-maximum-subarray	undefined
0054-spiral-matrix
0055-jump-game
0056-merge-intervals	undefined
0066-plus-one
0068-text-justification
0073-set-matrix-zeroes	undefined
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0090-subsets-ii	undefined
0108-convert-sorted-array-to-binary-search-tree
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0130-surrounded-regions	undefined
0134-gas-station
0135-candy
0140-word-break-ii	undefined
0152-maximum-product-subarray
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0189-rotate-array
0198-house-robber	undefined
0200-number-of-islands	undefined
0209-minimum-size-subarray-sum
0213-house-robber-ii	undefined
0216-combination-sum-iii	undefined
0219-contains-duplicate-ii
0238-product-of-array-except-self
0239-sliding-window-maximum	undefined
0274-h-index
0377-combination-sum-iv	undefined
0413-arithmetic-slices
0417-pacific-atlantic-water-flow	undefined
0463-island-perimeter	undefined
0542-01-matrix	undefined
0560-subarray-sum-equals-k	undefined
0594-longest-harmonious-subsequence
0643-maximum-average-subarray-i
0658-find-k-closest-elements
0695-max-area-of-island	undefined
0713-subarray-product-less-than-k
0733-flood-fill	undefined
0740-delete-and-earn	undefined
0747-min-cost-climbing-stairs	undefined
0928-surface-area-of-3d-shapes	undefined
0966-binary-subarrays-with-sum
0971-shortest-bridge	undefined
1020-longest-turbulent-subarray
1036-rotting-oranges	undefined
1046-max-consecutive-ones-iii
1073-number-of-enclaves	undefined
1171-shortest-path-in-binary-matrix	undefined
1222-remove-covered-intervals	undefined
1234-number-of-paths-with-max-score	undefined
1256-rank-transform-of-an-array	undefined
1360-maximum-length-of-a-concatenated-string-with-unique-characters	undefined
1370-count-number-of-nice-subarrays
1380-number-of-closed-islands	undefined
1381-maximum-score-words-formed-by-letters	undefined
1428-jump-game-iii	undefined
1436-get-watched-videos-by-your-friends	undefined
1586-longest-subarray-of-1s-after-deleting-one-element
1723-maximum-number-of-achievable-transfer-requests	undefined
1755-defuse-the-bomb
1776-minimum-operations-to-reduce-x-to-zero
1813-maximum-erasure-value
1876-map-of-highest-peak	undefined
1966-frequency-of-the-most-frequent-element
2035-count-sub-islands	undefined
2038-nearest-exit-from-entrance-in-maze	undefined
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2206-detonate-the-maximum-bombs	undefined
2482-maximum-rows-covered-by-columns	undefined
2696-the-number-of-beautiful-subsets	undefined
2794-maximum-number-of-moves-in-a-grid	undefined
2866-longest-even-odd-subarray-with-threshold
3092-minimum-moves-to-spread-stones-over-grid	undefined
3517-shortest-distance-after-road-addition-queries-i	undefined
3649-minimum-time-to-break-locks-i	undefined
3823-count-islands-with-total-value-divisible-by-k	undefined
3838-path-existence-queries-in-a-graph-i	undefined
3852-path-existence-queries-in-a-graph-ii	undefined
4062-house-robber-v	undefined
4071-word-squares-ii	undefined
1000005-pond-sizes-lcci	undefined
1000227-YesdPw	undefined
1000434-UEcfPD	undefined

Math

Problem Name	Difficulty
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0066-plus-one
0067-add-binary
0069-sqrtx
0070-climbing-stairs
0189-rotate-array
0928-surface-area-of-3d-shapes	undefined
1370-count-number-of-nice-subarrays
1430-find-the-k-beauty-of-a-number
2206-detonate-the-maximum-bombs	undefined
2348-count-number-of-texts	undefined
2696-the-number-of-beautiful-subsets	undefined
2802-find-the-punishment-number-of-an-integer	undefined
4135-concatenate-non-zero-digits-and-multiply-by-sum-i	undefined
4136-concatenate-non-zero-digits-and-multiply-by-sum-ii	undefined

Hash Table

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0030-substring-with-concatenation-of-all-words
0036-valid-sudoku
0073-set-matrix-zeroes	undefined
0076-minimum-window-substring	undefined
0140-word-break-ii	undefined
0141-linked-list-cycle	undefined
0142-linked-list-cycle-ii	undefined
0160-intersection-of-two-linked-lists	undefined
0169-majority-element
0187-repeated-dna-sequences
0205-isomorphic-strings
0219-contains-duplicate-ii
0242-valid-anagram
0290-word-pattern
0383-ransom-note
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0560-subarray-sum-equals-k	undefined
0594-longest-harmonious-subsequence
0740-delete-and-earn	undefined
0966-binary-subarrays-with-sum
1256-rank-transform-of-an-array	undefined
1261-swap-for-longest-repeated-character-substring
1370-count-number-of-nice-subarrays
1381-maximum-score-words-formed-by-letters	undefined
1436-get-watched-videos-by-your-friends	undefined
1460-number-of-substrings-containing-all-three-characters
1715-split-a-string-into-the-max-number-of-unique-substrings	undefined
1776-minimum-operations-to-reduce-x-to-zero
1813-maximum-erasure-value
1873-longest-nice-substring
1987-substrings-of-size-three-with-distinct-characters
2348-count-number-of-texts	undefined
2696-the-number-of-beautiful-subsets	undefined
3349-maximum-length-substring-with-two-occurrences
3838-path-existence-queries-in-a-graph-i	undefined

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0006-zigzag-conversion
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0022-generate-parentheses	undefined
0028-find-the-index-of-the-first-occurrence-in-a-string
0030-substring-with-concatenation-of-all-words
0058-length-of-last-word
0067-add-binary
0068-text-justification
0076-minimum-window-substring	undefined
0093-restore-ip-addresses	undefined
0125-valid-palindrome
0131-palindrome-partitioning	undefined
0140-word-break-ii	undefined
0151-reverse-words-in-a-string
0187-repeated-dna-sequences
0205-isomorphic-strings
0242-valid-anagram
0290-word-pattern
0301-remove-invalid-parentheses	undefined
0383-ransom-note
0392-is-subsequence
0395-longest-substring-with-at-least-k-repeating-characters
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
1211-iterator-for-combination	undefined
1261-swap-for-longest-repeated-character-substring
1321-get-equal-substrings-within-budget
1351-replace-the-substring-for-balanced-string
1360-maximum-length-of-a-concatenated-string-with-unique-characters	undefined
1381-maximum-score-words-formed-by-letters	undefined
1430-find-the-k-beauty-of-a-number
1460-number-of-substrings-containing-all-three-characters
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1715-split-a-string-into-the-max-number-of-unique-substrings	undefined
1873-longest-nice-substring
1976-splitting-a-string-into-descending-consecutive-values	undefined
1987-substrings-of-size-three-with-distinct-characters
2130-maximum-product-of-the-length-of-two-palindromic-subsequences	undefined
2348-count-number-of-texts	undefined
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3349-maximum-length-substring-with-two-occurrences
4071-word-squares-ii	undefined
4136-concatenate-non-zero-digits-and-multiply-by-sum-ii	undefined

Stack

Problem Name	Difficulty
0020-valid-parentheses
0042-trapping-rain-water
0094-binary-tree-inorder-traversal
0234-palindrome-linked-list	undefined

Linked List

Problem Name	Difficulty
0021-merge-two-sorted-lists
0083-remove-duplicates-from-sorted-list
0141-linked-list-cycle	undefined
0142-linked-list-cycle-ii	undefined
0160-intersection-of-two-linked-lists	undefined
0206-reverse-linked-list	undefined
0234-palindrome-linked-list	undefined

Recursion

Problem Name	Difficulty
0021-merge-two-sorted-lists
0206-reverse-linked-list	undefined
0234-palindrome-linked-list	undefined

Two Pointers

Problem Name	Difficulty
0011-container-with-most-water
0015-3sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle	undefined
0142-linked-list-cycle-ii	undefined
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists	undefined
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0234-palindrome-linked-list	undefined
0392-is-subsequence
0658-find-k-closest-elements
3852-path-existence-queries-in-a-graph-ii	undefined

String Matching

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string

Binary Search

Problem Name	Difficulty
0035-search-insert-position
0069-sqrtx
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0658-find-k-closest-elements
0713-subarray-product-less-than-k
1046-max-consecutive-ones-iii
1321-get-equal-substrings-within-budget
1776-minimum-operations-to-reduce-x-to-zero
1966-frequency-of-the-most-frequent-element
3838-path-existence-queries-in-a-graph-i	undefined
3852-path-existence-queries-in-a-graph-ii	undefined

Bit Manipulation

Problem Name	Difficulty
0067-add-binary
0090-subsets-ii	undefined
0187-repeated-dna-sequences
1360-maximum-length-of-a-concatenated-string-with-unique-characters	undefined
1381-maximum-score-words-formed-by-letters	undefined
1723-maximum-number-of-achievable-transfer-requests	undefined
1873-longest-nice-substring
2130-maximum-product-of-the-length-of-two-palindromic-subsequences	undefined
2482-maximum-rows-covered-by-columns	undefined
3092-minimum-moves-to-spread-stones-over-grid	undefined
3217-number-of-possible-sets-of-closing-branches	undefined
3649-minimum-time-to-break-locks-i	undefined
3852-path-existence-queries-in-a-graph-ii	undefined
1000434-UEcfPD	undefined

Simulation

Problem Name	Difficulty
0054-spiral-matrix
0067-add-binary
0068-text-justification

Dynamic Programming

Problem Name	Difficulty
0022-generate-parentheses	undefined
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray	undefined
0055-jump-game
0070-climbing-stairs
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0131-palindrome-partitioning	undefined
0140-word-break-ii	undefined
0152-maximum-product-subarray
0198-house-robber	undefined
0213-house-robber-ii	undefined
0377-combination-sum-iv	undefined
0392-is-subsequence
0413-arithmetic-slices
0542-01-matrix	undefined
0740-delete-and-earn	undefined
0747-min-cost-climbing-stairs	undefined
1020-longest-turbulent-subarray
1234-number-of-paths-with-max-score	undefined
1381-maximum-score-words-formed-by-letters	undefined
1586-longest-subarray-of-1s-after-deleting-one-element
2130-maximum-product-of-the-length-of-two-palindromic-subsequences	undefined
2348-count-number-of-texts	undefined
2397-count-number-of-ways-to-place-houses	undefined
2562-count-ways-to-build-good-strings	undefined
2696-the-number-of-beautiful-subsets	undefined
2794-maximum-number-of-moves-in-a-grid	undefined
3092-minimum-moves-to-spread-stones-over-grid	undefined
3649-minimum-time-to-break-locks-i	undefined
3852-path-existence-queries-in-a-graph-ii	undefined
4062-house-robber-v	undefined

Memoization

Problem Name	Difficulty
0070-climbing-stairs
0140-word-break-ii	undefined

Sorting

Problem Name	Difficulty
0015-3sum
0056-merge-intervals	undefined
0088-merge-sorted-array
0169-majority-element
0242-valid-anagram
0274-h-index
0594-longest-harmonious-subsequence
0658-find-k-closest-elements
1222-remove-covered-intervals	undefined
1256-rank-transform-of-an-array	undefined
1436-get-watched-videos-by-your-friends	undefined
1966-frequency-of-the-most-frequent-element
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2696-the-number-of-beautiful-subsets	undefined
3852-path-existence-queries-in-a-graph-ii	undefined
4071-word-squares-ii	undefined

Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree

Depth-First Search

Problem Name	Difficulty
0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0130-surrounded-regions	undefined
0200-number-of-islands	undefined
0417-pacific-atlantic-water-flow	undefined
0463-island-perimeter	undefined
0547-number-of-provinces	undefined
0695-max-area-of-island	undefined
0733-flood-fill	undefined
0813-all-paths-from-source-to-target	undefined
0871-keys-and-rooms	undefined
0971-shortest-bridge	undefined
1073-number-of-enclaves	undefined
1380-number-of-closed-islands	undefined
1428-jump-game-iii	undefined
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph	undefined
1442-number-of-operations-to-make-network-connected	undefined
2035-count-sub-islands	undefined
2121-find-if-path-exists-in-graph	undefined
2206-detonate-the-maximum-bombs	undefined
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph	undefined
2582-minimum-score-of-a-path-between-two-cities	undefined
2793-count-the-number-of-complete-components	undefined
3561-remove-methods-from-project	undefined
3823-count-islands-with-total-value-divisible-by-k	undefined
1000005-pond-sizes-lcci	undefined
1000227-YesdPw	undefined

Binary Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree

Breadth-First Search

Problem Name	Difficulty
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0130-surrounded-regions	undefined
0200-number-of-islands	undefined
0301-remove-invalid-parentheses	undefined
0417-pacific-atlantic-water-flow	undefined
0463-island-perimeter	undefined
0542-01-matrix	undefined
0547-number-of-provinces	undefined
0695-max-area-of-island	undefined
0733-flood-fill	undefined
0813-all-paths-from-source-to-target	undefined
0871-keys-and-rooms	undefined
0971-shortest-bridge	undefined
1036-rotting-oranges	undefined
1073-number-of-enclaves	undefined
1171-shortest-path-in-binary-matrix	undefined
1380-number-of-closed-islands	undefined
1428-jump-game-iii	undefined
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph	undefined
1436-get-watched-videos-by-your-friends	undefined
1442-number-of-operations-to-make-network-connected	undefined
1876-map-of-highest-peak	undefined
2035-count-sub-islands	undefined
2038-nearest-exit-from-entrance-in-maze	undefined
2121-find-if-path-exists-in-graph	undefined
2206-detonate-the-maximum-bombs	undefined
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph	undefined
2582-minimum-score-of-a-path-between-two-cities	undefined
2793-count-the-number-of-complete-components	undefined
3517-shortest-distance-after-road-addition-queries-i	undefined
3561-remove-methods-from-project	undefined
3649-minimum-time-to-break-locks-i	undefined
3823-count-islands-with-total-value-divisible-by-k	undefined
1000005-pond-sizes-lcci	undefined
1000227-YesdPw	undefined

Divide and Conquer

Problem Name	Difficulty
0053-maximum-subarray	undefined
0108-convert-sorted-array-to-binary-search-tree
0169-majority-element
0395-longest-substring-with-at-least-k-repeating-characters
1873-longest-nice-substring

Binary Search Tree

Problem Name	Difficulty
0108-convert-sorted-array-to-binary-search-tree

Counting

Problem Name	Difficulty
0169-majority-element
0383-ransom-note
0594-longest-harmonious-subsequence
1381-maximum-score-words-formed-by-letters	undefined
1987-substrings-of-size-three-with-distinct-characters

Greedy

Problem Name	Difficulty
0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0135-candy
1966-frequency-of-the-most-frequent-element
3852-path-existence-queries-in-a-graph-ii	undefined

Counting Sort

Problem Name	Difficulty
0274-h-index

Prefix Sum

Problem Name	Difficulty
0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0560-subarray-sum-equals-k	undefined
0713-subarray-product-less-than-k
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1321-get-equal-substrings-within-budget
1370-count-number-of-nice-subarrays
1776-minimum-operations-to-reduce-x-to-zero
1966-frequency-of-the-most-frequent-element
4136-concatenate-non-zero-digits-and-multiply-by-sum-ii	undefined

Monotonic Stack

Problem Name	Difficulty
0042-trapping-rain-water

Trie

Problem Name	Difficulty
0014-longest-common-prefix
0140-word-break-ii	undefined

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0076-minimum-window-substring	undefined
0187-repeated-dna-sequences
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum	undefined
0395-longest-substring-with-at-least-k-repeating-characters
0413-arithmetic-slices
0424-longest-repeating-character-replacement
0438-find-all-anagrams-in-a-string
0594-longest-harmonious-subsequence
0643-maximum-average-subarray-i
0658-find-k-closest-elements
0713-subarray-product-less-than-k
0966-binary-subarrays-with-sum
1020-longest-turbulent-subarray
1046-max-consecutive-ones-iii
1261-swap-for-longest-repeated-character-substring
1321-get-equal-substrings-within-budget
1351-replace-the-substring-for-balanced-string
1370-count-number-of-nice-subarrays
1430-find-the-k-beauty-of-a-number
1460-number-of-substrings-containing-all-three-characters
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1586-longest-subarray-of-1s-after-deleting-one-element
1755-defuse-the-bomb
1776-minimum-operations-to-reduce-x-to-zero
1813-maximum-erasure-value
1873-longest-nice-substring
1966-frequency-of-the-most-frequent-element
1987-substrings-of-size-three-with-distinct-characters
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2866-longest-even-odd-subarray-with-threshold
3349-maximum-length-substring-with-two-occurrences

Rolling Hash

Problem Name	Difficulty
0187-repeated-dna-sequences

Hash Function

Problem Name	Difficulty
0187-repeated-dna-sequences

Heap (Priority Queue)

Problem Name	Difficulty
0239-sliding-window-maximum	undefined
0658-find-k-closest-elements
3217-number-of-possible-sets-of-closing-branches	undefined

Matrix

Problem Name	Difficulty
0036-valid-sudoku
0054-spiral-matrix
0073-set-matrix-zeroes	undefined
0130-surrounded-regions	undefined
0200-number-of-islands	undefined
0417-pacific-atlantic-water-flow	undefined
0463-island-perimeter	undefined
0542-01-matrix	undefined
0695-max-area-of-island	undefined
0733-flood-fill	undefined
0928-surface-area-of-3d-shapes	undefined
0971-shortest-bridge	undefined
1036-rotting-oranges	undefined
1073-number-of-enclaves	undefined
1171-shortest-path-in-binary-matrix	undefined
1234-number-of-paths-with-max-score	undefined
1380-number-of-closed-islands	undefined
1876-map-of-highest-peak	undefined
2035-count-sub-islands	undefined
2038-nearest-exit-from-entrance-in-maze	undefined
2482-maximum-rows-covered-by-columns	undefined
2794-maximum-number-of-moves-in-a-grid	undefined
3092-minimum-moves-to-spread-stones-over-grid	undefined
3823-count-islands-with-total-value-divisible-by-k	undefined
1000005-pond-sizes-lcci	undefined
1000227-YesdPw	undefined

Backtracking

Problem Name	Difficulty
0022-generate-parentheses	undefined
0039-combination-sum	undefined
0046-permutations	undefined
0051-n-queens	undefined
0077-combinations	undefined
0090-subsets-ii	undefined
0093-restore-ip-addresses	undefined
0131-palindrome-partitioning	undefined
0140-word-break-ii	undefined
0216-combination-sum-iii	undefined
0301-remove-invalid-parentheses	undefined
0813-all-paths-from-source-to-target	undefined
1211-iterator-for-combination	undefined
1360-maximum-length-of-a-concatenated-string-with-unique-characters	undefined
1381-maximum-score-words-formed-by-letters	undefined
1715-split-a-string-into-the-max-number-of-unique-substrings	undefined
1723-maximum-number-of-achievable-transfer-requests	undefined
1976-splitting-a-string-into-descending-consecutive-values	undefined
2130-maximum-product-of-the-length-of-two-palindromic-subsequences	undefined
2482-maximum-rows-covered-by-columns	undefined
2696-the-number-of-beautiful-subsets	undefined
2802-find-the-punishment-number-of-an-integer	undefined
3092-minimum-moves-to-spread-stones-over-grid	undefined
3649-minimum-time-to-break-locks-i	undefined
4071-word-squares-ii	undefined
1000434-UEcfPD	undefined

Enumeration

Problem Name	Difficulty
1723-maximum-number-of-achievable-transfer-requests	undefined
1976-splitting-a-string-into-descending-consecutive-values	undefined
2482-maximum-rows-covered-by-columns	undefined
3217-number-of-possible-sets-of-closing-branches	undefined
4071-word-squares-ii	undefined
1000434-UEcfPD	undefined

Bitmask

Problem Name	Difficulty
1381-maximum-score-words-formed-by-letters	undefined
2130-maximum-product-of-the-length-of-two-palindromic-subsequences	undefined
3092-minimum-moves-to-spread-stones-over-grid	undefined
3649-minimum-time-to-break-locks-i	undefined

Combinatorics

Problem Name	Difficulty
2696-the-number-of-beautiful-subsets	undefined

Graph

Problem Name	Difficulty
0547-number-of-provinces	undefined
0813-all-paths-from-source-to-target	undefined
0871-keys-and-rooms	undefined
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph	undefined
1436-get-watched-videos-by-your-friends	undefined
1442-number-of-operations-to-make-network-connected	undefined
2121-find-if-path-exists-in-graph	undefined
2206-detonate-the-maximum-bombs	undefined
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph	undefined
2582-minimum-score-of-a-path-between-two-cities	undefined
2793-count-the-number-of-complete-components	undefined
3217-number-of-possible-sets-of-closing-branches	undefined
3517-shortest-distance-after-road-addition-queries-i	undefined
3561-remove-methods-from-project	undefined
3838-path-existence-queries-in-a-graph-i	undefined
3852-path-existence-queries-in-a-graph-ii	undefined

Shortest Path

Problem Name	Difficulty
3217-number-of-possible-sets-of-closing-branches	undefined

Design

Problem Name	Difficulty
1211-iterator-for-combination	undefined

Iterator

Problem Name	Difficulty
1211-iterator-for-combination	undefined

Union Find

Problem Name	Difficulty
0130-surrounded-regions	undefined
0200-number-of-islands	undefined
0547-number-of-provinces	undefined
0695-max-area-of-island	undefined
1073-number-of-enclaves	undefined
1380-number-of-closed-islands	undefined
1442-number-of-operations-to-make-network-connected	undefined
2035-count-sub-islands	undefined
2121-find-if-path-exists-in-graph	undefined
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph	undefined
2582-minimum-score-of-a-path-between-two-cities	undefined
2793-count-the-number-of-complete-components	undefined
3823-count-islands-with-total-value-divisible-by-k	undefined
3838-path-existence-queries-in-a-graph-i	undefined
1000005-pond-sizes-lcci	undefined
1000227-YesdPw	undefined

Geometry

Problem Name	Difficulty
0928-surface-area-of-3d-shapes	undefined
2206-detonate-the-maximum-bombs	undefined

Queue

Problem Name	Difficulty
0239-sliding-window-maximum	undefined

Monotonic Queue

Problem Name	Difficulty
0239-sliding-window-maximum	undefined

Topological Sort

Problem Name	Difficulty
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph	undefined