Leetcode

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

LeetCode Topics

Math

0189-rotate-array
3536-maximum-product-of-two-digits
3663-find-the-least-frequent-digit
3751-total-waviness-of-numbers-in-range-i
3783-mirror-distance-of-an-integer

Array

0026-remove-duplicates-from-sorted-array
0189-rotate-array
0283-move-zeroes
0416-partition-equal-subset-sum
0735-asteroid-collision
0846-hand-of-straights
0853-car-fleet
0889-construct-binary-tree-from-preorder-and-postorder-traversal
0946-validate-stack-sequences
1074-number-of-submatrices-that-sum-to-target
1122-relative-sort-array
1288-remove-covered-intervals
1340-jump-game-v
1385-find-the-distance-value-between-two-arrays
1436-destination-city
1504-count-submatrices-with-all-ones
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1636-sort-array-by-increasing-frequency
1733-minimum-number-of-people-to-teach
1944-number-of-visible-people-in-a-queue
2006-count-number-of-pairs-with-absolute-difference-k
2032-two-out-of-three
2341-maximum-number-of-pairs-in-array
2352-equal-row-and-column-pairs
2444-count-subarrays-with-fixed-bounds
3159-find-occurrences-of-an-element-in-an-array
3184-count-pairs-that-form-a-complete-day-i
3342-find-minimum-time-to-reach-last-room-ii
3532-path-existence-queries-in-a-graph-i
3663-find-the-least-frequent-digit
3712-sum-of-elements-with-frequency-divisible-by-k
3741-minimum-distance-between-three-equal-elements-ii
3859-count-subarrays-with-k-distinct-integers
3974-maximum-total-sum-of-k-selected-elements

Dynamic Programming

0005-longest-palindromic-substring
0032-longest-valid-parentheses
0416-partition-equal-subset-sum
1340-jump-game-v
1504-count-submatrices-with-all-ones
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3751-total-waviness-of-numbers-in-range-i

Stack

0032-longest-valid-parentheses
0071-simplify-path
0155-min-stack
0735-asteroid-collision
0853-car-fleet
0895-maximum-frequency-stack
0946-validate-stack-sequences
1504-count-submatrices-with-all-ones
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1717-maximum-score-from-removing-substrings
1944-number-of-visible-people-in-a-queue

Greedy

0846-hand-of-straights
1433-check-if-a-string-can-break-another-string
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1717-maximum-score-from-removing-substrings
1733-minimum-number-of-people-to-teach
2405-optimal-partition-of-string
3974-maximum-total-sum-of-k-selected-elements

Monotonic Stack

0853-car-fleet
1504-count-submatrices-with-all-ones
1526-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1944-number-of-visible-people-in-a-queue

Simulation

0735-asteroid-collision
0946-validate-stack-sequences
2352-equal-row-and-column-pairs

Matrix

1074-number-of-submatrices-that-sum-to-target
1504-count-submatrices-with-all-ones
2352-equal-row-and-column-pairs
3342-find-minimum-time-to-reach-last-room-ii

Hash Table

0451-sort-characters-by-frequency
0791-custom-sort-string
0846-hand-of-straights
0889-construct-binary-tree-from-preorder-and-postorder-traversal
0895-maximum-frequency-stack
1074-number-of-submatrices-that-sum-to-target
1122-relative-sort-array
1436-destination-city
1636-sort-array-by-increasing-frequency
1733-minimum-number-of-people-to-teach
2006-count-number-of-pairs-with-absolute-difference-k
2032-two-out-of-three
2103-rings-and-rods
2186-minimum-number-of-steps-to-make-two-strings-anagram-ii
2341-maximum-number-of-pairs-in-array
2351-first-letter-to-appear-twice
2352-equal-row-and-column-pairs
2405-optimal-partition-of-string
2716-minimize-string-length
3120-count-the-number-of-special-characters-i
3159-find-occurrences-of-an-element-in-an-array
3184-count-pairs-that-form-a-complete-day-i
3223-minimum-length-of-string-after-operations
3532-path-existence-queries-in-a-graph-i
3663-find-the-least-frequent-digit
3712-sum-of-elements-with-frequency-divisible-by-k
3741-minimum-distance-between-three-equal-elements-ii
3859-count-subarrays-with-k-distinct-integers
3941-password-strength

String

0005-longest-palindromic-substring
0008-string-to-integer-atoi
0032-longest-valid-parentheses
0058-length-of-last-word
0071-simplify-path
0451-sort-characters-by-frequency
0791-custom-sort-string
1433-check-if-a-string-can-break-another-string
1436-destination-city
1717-maximum-score-from-removing-substrings
1859-sorting-the-sentence
2103-rings-and-rods
2186-minimum-number-of-steps-to-make-two-strings-anagram-ii
2351-first-letter-to-appear-twice
2405-optimal-partition-of-string
2716-minimize-string-length
2833-furthest-point-from-origin
3120-count-the-number-of-special-characters-i
3223-minimum-length-of-string-after-operations
3517-smallest-palindromic-rearrangement-i
3941-password-strength

Graph Theory

1579-remove-max-number-of-edges-to-keep-graph-fully-traversable
3342-find-minimum-time-to-reach-last-room-ii
3532-path-existence-queries-in-a-graph-i

Heap (Priority Queue)

0451-sort-characters-by-frequency
3342-find-minimum-time-to-reach-last-room-ii

Shortest Path

3342-find-minimum-time-to-reach-last-room-ii

Sorting

0451-sort-characters-by-frequency
0791-custom-sort-string
0846-hand-of-straights
0853-car-fleet
1122-relative-sort-array
1288-remove-covered-intervals
1340-jump-game-v
1385-find-the-distance-value-between-two-arrays
1433-check-if-a-string-can-break-another-string
1636-sort-array-by-increasing-frequency
1859-sorting-the-sentence
3517-smallest-palindromic-rearrangement-i
3536-maximum-product-of-two-digits
3974-maximum-total-sum-of-k-selected-elements

Design

0155-min-stack
0895-maximum-frequency-stack

Counting

0451-sort-characters-by-frequency
2006-count-number-of-pairs-with-absolute-difference-k
2186-minimum-number-of-steps-to-make-two-strings-anagram-ii
2341-maximum-number-of-pairs-in-array
2351-first-letter-to-appear-twice
2833-furthest-point-from-origin
3184-count-pairs-that-form-a-complete-day-i
3223-minimum-length-of-string-after-operations
3663-find-the-least-frequent-digit
3712-sum-of-elements-with-frequency-divisible-by-k
3859-count-subarrays-with-k-distinct-integers

Two Pointers

0005-longest-palindromic-substring
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0189-rotate-array
0283-move-zeroes
1385-find-the-distance-value-between-two-arrays

Linked List

0019-remove-nth-node-from-end-of-list

Binary Search

1385-find-the-distance-value-between-two-arrays
3532-path-existence-queries-in-a-graph-i

Union-Find

1579-remove-max-number-of-edges-to-keep-graph-fully-traversable
3532-path-existence-queries-in-a-graph-i

Bucket Sort

0451-sort-characters-by-frequency

Sliding Window

2444-count-subarrays-with-fixed-bounds
3859-count-subarrays-with-k-distinct-integers

Divide and Conquer

0889-construct-binary-tree-from-preorder-and-postorder-traversal

Tree

0889-construct-binary-tree-from-preorder-and-postorder-traversal

Binary Tree

0889-construct-binary-tree-from-preorder-and-postorder-traversal

Bit Manipulation

2032-two-out-of-three
2351-first-letter-to-appear-twice

Prefix Sum

1074-number-of-submatrices-that-sum-to-target

Enumeration

3751-total-waviness-of-numbers-in-range-i

Queue

2444-count-subarrays-with-fixed-bounds

Monotonic Queue

2444-count-subarrays-with-fixed-bounds

Counting Sort

1122-relative-sort-array
3517-smallest-palindromic-rearrangement-i

Ordered Set

0895-maximum-frequency-stack