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

LeetCode Topics

Math

0012-integer-to-roman
0273-integer-to-english-words
0870-magic-squares-in-grid
1086-divisor-game
1642-water-bottles
1951-find-the-winner-of-the-circular-game

Simulation

0289-game-of-life
0735-asteroid-collision
0921-spiral-matrix-iii
1642-water-bottles
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2846-robot-collisions

Array

0018-4sum
0031-next-permutation
0042-trapping-rain-water
0053-maximum-subarray
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0134-gas-station
0162-find-peak-element
0198-house-robber
0213-house-robber-ii
0238-product-of-array-except-self
0287-find-the-duplicate-number
0289-game-of-life
0300-longest-increasing-subsequence
0399-evaluate-division
0452-minimum-number-of-arrows-to-burst-balloons
0735-asteroid-collision
0870-magic-squares-in-grid
0907-koko-eating-bananas
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1196-filling-bookcase-shelves
1207-delete-nodes-and-return-forest
1333-sort-the-jumbled-numbers
1496-lucky-numbers-in-a-matrix
1511-count-number-of-teams
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1711-find-valid-matrix-given-row-and-column-sums
1720-crawler-log-folder
1741-sort-array-by-increasing-frequency
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2163-kth-distinct-string-in-an-array
2255-minimum-swaps-to-group-all-1s-together-ii
2306-create-binary-tree-from-descriptions
2472-build-a-matrix-with-conditions
2502-sort-the-people
2727-number-of-senior-citizens
2846-robot-collisions
3235-minimum-cost-to-convert-string-i

Recursion

0143-reorder-list
0273-integer-to-english-words
0394-decode-string
1951-find-the-winner-of-the-circular-game

Queue

0969-number-of-recent-calls
1951-find-the-winner-of-the-circular-game

Stack

0032-longest-valid-parentheses
0042-trapping-rain-water
0114-flatten-binary-tree-to-linked-list
0143-reorder-list
0173-binary-search-tree-iterator
0394-decode-string
0726-number-of-atoms
0735-asteroid-collision
1298-reverse-substrings-between-each-pair-of-parentheses
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
2236-maximum-twin-sum-of-a-linked-list
2846-robot-collisions

String

0006-zigzag-conversion
0012-integer-to-roman
0032-longest-valid-parentheses
0038-count-and-say
0091-decode-ways
0151-reverse-words-in-a-string
0273-integer-to-english-words
0394-decode-string
0399-evaluate-division
0647-palindromic-substrings
0726-number-of-atoms
1250-longest-common-subsequence
1298-reverse-substrings-between-each-pair-of-parentheses
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1764-maximum-repeating-substring
1818-maximum-score-from-removing-substrings
2163-kth-distinct-string-in-an-array
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2502-sort-the-people
2727-number-of-senior-citizens
3235-minimum-cost-to-convert-string-i
3276-minimum-number-of-pushes-to-type-word-ii

Binary Search

0162-find-peak-element
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0907-koko-eating-bananas
1615-range-sum-of-sorted-subarray-sums

Dynamic Programming

0032-longest-valid-parentheses
0042-trapping-rain-water
0053-maximum-subarray
0091-decode-ways
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0647-palindromic-substrings
1086-divisor-game
1196-filling-bookcase-shelves
1250-longest-common-subsequence
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1511-count-number-of-teams
1756-minimum-deletions-to-make-string-balanced
1764-maximum-repeating-substring

Design

0173-binary-search-tree-iterator
0969-number-of-recent-calls

Data Stream

0969-number-of-recent-calls

Linked List

0019-remove-nth-node-from-end-of-list
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0143-reorder-list
0148-sort-list
0328-odd-even-linked-list
2236-maximum-twin-sum-of-a-linked-list

Two Pointers

0018-4sum
0019-remove-nth-node-from-end-of-list
0031-next-permutation
0042-trapping-rain-water
0075-sort-colors
0143-reorder-list
0148-sort-list
0151-reverse-words-in-a-string
0287-find-the-duplicate-number
0647-palindromic-substrings
1615-range-sum-of-sorted-subarray-sums
2236-maximum-twin-sum-of-a-linked-list

Tree

0098-validate-binary-search-tree
0103-binary-tree-zigzag-level-order-traversal
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
1207-delete-nodes-and-return-forest
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions

Depth-First Search

0098-validate-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0399-evaluate-division
0999-regions-cut-by-slashes
1207-delete-nodes-and-return-forest
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another

Breadth-First Search

0103-binary-tree-zigzag-level-order-traversal
0117-populating-next-right-pointers-in-each-node-ii
0199-binary-tree-right-side-view
0207-course-schedule
0210-course-schedule-ii
0399-evaluate-division
0999-regions-cut-by-slashes
2171-second-minimum-time-to-reach-destination

Binary Tree

0098-validate-binary-search-tree
0103-binary-tree-zigzag-level-order-traversal
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
1207-delete-nodes-and-return-forest
1653-number-of-good-leaf-nodes-pairs
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions

Sorting

0018-4sum
0075-sort-colors
0148-sort-list
0452-minimum-number-of-arrows-to-burst-balloons
0726-number-of-atoms
1333-sort-the-jumbled-numbers
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1741-sort-array-by-increasing-frequency
2502-sort-the-people
2846-robot-collisions
3276-minimum-number-of-pushes-to-type-word-ii

Greedy

0134-gas-station
0452-minimum-number-of-arrows-to-burst-balloons
1711-find-valid-matrix-given-row-and-column-sums
1818-maximum-score-from-removing-substrings
3276-minimum-number-of-pushes-to-type-word-ii

Hash Table

0012-integer-to-roman
0073-set-matrix-zeroes
0138-copy-list-with-random-pointer
0726-number-of-atoms
0870-magic-squares-in-grid
0999-regions-cut-by-slashes
1207-delete-nodes-and-return-forest
1556-make-two-arrays-equal-by-reversing-subarrays
1741-sort-array-by-increasing-frequency
2163-kth-distinct-string-in-an-array
2306-create-binary-tree-from-descriptions
2502-sort-the-people
3276-minimum-number-of-pushes-to-type-word-ii

Matrix

0073-set-matrix-zeroes
0289-game-of-life
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0999-regions-cut-by-slashes
1496-lucky-numbers-in-a-matrix
1711-find-valid-matrix-given-row-and-column-sums
2472-build-a-matrix-with-conditions

Binary Search Tree

0098-validate-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst

Iterator

0173-binary-search-tree-iterator

Union Find

0399-evaluate-division
0999-regions-cut-by-slashes

Graph

0207-course-schedule
0210-course-schedule-ii
0399-evaluate-division
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2171-second-minimum-time-to-reach-destination
2472-build-a-matrix-with-conditions
3235-minimum-cost-to-convert-string-i

Shortest Path

0399-evaluate-division
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
2171-second-minimum-time-to-reach-destination
3235-minimum-cost-to-convert-string-i

Bit Manipulation

0078-subsets
0287-find-the-duplicate-number

Divide and Conquer

0053-maximum-subarray
0148-sort-list

Merge Sort

0148-sort-list

Topological Sort

0207-course-schedule
0210-course-schedule-ii
2472-build-a-matrix-with-conditions

Prefix Sum

0238-product-of-array-except-self

Backtracking

0078-subsets

Binary Indexed Tree

1511-count-number-of-teams

Brainteaser

1086-divisor-game

Game Theory

1086-divisor-game

String Matching

1764-maximum-repeating-substring

Sliding Window

2255-minimum-swaps-to-group-all-1s-together-ii

Monotonic Stack

0042-trapping-rain-water

Counting

2163-kth-distinct-string-in-an-array
3276-minimum-number-of-pushes-to-type-word-ii

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