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

LeetCode Topics

Array

0001-two-sum
0011-container-with-most-water
0026-remove-duplicates-from-sorted-array
0027-remove-element
0035-search-insert-position
0053-maximum-subarray
0121-best-time-to-buy-and-sell-stock
0189-rotate-array
0209-minimum-size-subarray-sum
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0283-move-zeroes
0854-making-a-large-island
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1335-maximum-candies-allocated-to-k-children
1364-tuple-with-same-product
1396-count-servers-that-communicate
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1813-maximum-erasure-value
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1927-maximum-ascending-subarray-sum
2107-find-unique-binary-string
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2265-partition-array-according-to-given-pivot
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2551-apply-operations-to-an-array
2564-most-profitable-path-in-a-tree
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2665-minimum-time-to-repair-cars
2707-merge-two-2d-arrays-by-summing-values
2764-maximum-number-of-fish-in-a-grid
2888-minimum-index-of-a-valid-split
2917-count-pairs-whose-sum-is-less-than-target
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3332-minimum-operations-to-exceed-threshold-value-ii
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3429-special-array-i
3430-count-days-without-meetings
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
3643-zero-array-transformation-ii
3657-check-if-grid-can-be-cut-into-sections

Matrix

0854-making-a-large-island
1396-count-servers-that-communicate
1876-map-of-highest-peak
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
3227-find-missing-and-repeated-values

Prefix Sum

0209-minimum-size-subarray-sum
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
2145-grid-game
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3643-zero-array-transformation-ii

Breadth-First Search

0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
1876-map-of-highest-peak
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid

Depth-First Search

0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
2246-maximum-employees-to-be-invited-to-a-meeting
2564-most-profitable-path-in-a-tree
2764-maximum-number-of-fish-in-a-grid

Union Find

0684-redundant-connection
0854-making-a-large-island
1396-count-servers-that-communicate
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
3219-make-lexicographically-smallest-array-by-swapping-elements

Counting

1160-letter-tile-possibilities
1364-tuple-with-same-product
1396-count-servers-that-communicate
1915-check-if-one-string-swap-can-make-strings-equal
2448-count-number-of-bad-pairs
2614-maximum-count-of-positive-integer-and-negative-integer

Graph

0684-redundant-connection
0820-find-eventual-safe-states
1558-course-schedule-iv
2246-maximum-employees-to-be-invited-to-a-meeting
2564-most-profitable-path-in-a-tree
2583-divide-nodes-into-the-maximum-number-of-groups

Topological Sort

0820-find-eventual-safe-states
1558-course-schedule-iv
2246-maximum-employees-to-be-invited-to-a-meeting

Sorting

0215-kth-largest-element-in-an-array
0217-contains-duplicate
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2160-minimum-operations-to-make-a-uni-value-grid
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
2888-minimum-index-of-a-valid-split
2917-count-pairs-whose-sum-is-less-than-target
3219-make-lexicographically-smallest-array-by-swapping-elements
3430-count-days-without-meetings
3657-check-if-grid-can-be-cut-into-sections

Hash Table

0001-two-sum
0217-contains-duplicate
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1160-letter-tile-possibilities
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1813-maximum-erasure-value
1915-check-if-one-string-swap-can-make-strings-equal
2107-find-unique-binary-string
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2707-merge-two-2d-arrays-by-summing-values
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3434-find-the-number-of-distinct-colors-among-the-balls

String

0058-length-of-last-word
0459-repeated-substring-pattern
0686-repeated-string-match
1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1170-shortest-common-supersequence
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1756-minimum-deletions-to-make-string-balanced
1915-check-if-one-string-swap-can-make-strings-equal
2021-remove-all-occurrences-of-a-substring
2107-find-unique-binary-string
2168-check-if-numbers-are-ascending-in-a-sentence
2243-check-if-all-as-appears-before-all-bs
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3447-clear-digits

Simulation

2021-remove-all-occurrences-of-a-substring
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
3332-minimum-operations-to-exceed-threshold-value-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits

Design

1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
2434-design-a-number-container-system

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2588-maximum-number-of-points-from-grid-queries
3332-minimum-operations-to-exceed-threshold-value-ii

Ordered Set

2280-count-good-triplets-in-an-array
2434-design-a-number-container-system

Math

0189-rotate-array
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
2160-minimum-operations-to-make-a-uni-value-grid
2448-count-number-of-bad-pairs
2610-closest-prime-numbers-in-range
2649-count-total-number-of-colored-cells
2802-find-the-punishment-number-of-an-integer
3227-find-missing-and-repeated-values

Stack

1756-minimum-deletions-to-make-string-balanced
2021-remove-all-occurrences-of-a-substring
2456-construct-smallest-number-from-di-string
3447-clear-digits

Data Stream

1477-product-of-the-last-k-numbers

Backtracking

1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
2107-find-unique-binary-string
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer

Greedy

0011-container-with-most-water
2456-construct-smallest-number-from-di-string

Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree
2564-most-profitable-path-in-a-tree

Binary Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree

Divide and Conquer

0053-maximum-subarray
0215-kth-largest-element-in-an-array
0925-construct-binary-tree-from-preorder-and-postorder-traversal
2280-count-good-triplets-in-an-array

Dynamic Programming

0053-maximum-subarray
0121-best-time-to-buy-and-sell-stock
1170-shortest-common-supersequence
1631-number-of-sub-arrays-with-odd-sum
1756-minimum-deletions-to-make-string-balanced
1849-maximum-absolute-sum-of-any-subarray

Two Pointers

0011-container-with-most-water
0026-remove-duplicates-from-sorted-array
0027-remove-element
0189-rotate-array
0283-move-zeroes
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
2588-maximum-number-of-points-from-grid-queries
2707-merge-two-2d-arrays-by-summing-values
2917-count-pairs-whose-sum-is-less-than-target

Quickselect

0215-kth-largest-element-in-an-array

Number Theory

2610-closest-prime-numbers-in-range

Sliding Window

0209-minimum-size-subarray-sum
1813-maximum-erasure-value
2112-minimum-difference-between-highest-and-lowest-of-k-scores
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii

Binary Search

0035-search-insert-position
0209-minimum-size-subarray-sum
1335-maximum-candies-allocated-to-k-children
2280-count-good-triplets-in-an-array
2614-maximum-count-of-positive-integer-and-negative-integer
2665-minimum-time-to-repair-cars
2917-count-pairs-whose-sum-is-less-than-target
3643-zero-array-transformation-ii

Bit Manipulation

3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Queue

3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Enumeration

1656-count-good-triplets

Binary Indexed Tree

2280-count-good-triplets-in-an-array

Segment Tree

2280-count-good-triplets-in-an-array

Merge Sort

2280-count-good-triplets-in-an-array

String Matching

0459-repeated-substring-pattern
0686-repeated-string-match