Leetcode

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

LeetCode Topics

Array

0011-container-with-most-water
0015-3sum
0027-remove-element
0036-valid-sudoku
0037-sudoku-solver
0048-rotate-image
0088-merge-sorted-array
0120-triangle
0417-pacific-atlantic-water-flow
0498-diagonal-traverse
0830-largest-triangle-area
1006-vowel-spellchecker
1018-largest-perimeter-triangle
1111-minimum-score-triangulation-of-polygon
1426-find-n-unique-integers-sum-up-to-zero
1435-xor-queries-of-a-subarray
1834-minimum-number-of-people-to-teach
2023-design-movie-rental-system
2324-find-triangular-sum-of-an-array
2429-design-a-food-rating-system
3251-maximum-area-of-longest-diagonal-rectangle
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3733-length-of-longest-v-shaped-diagonal-segment
3744-minimum-operations-to-make-array-elements-zero
3827-implement-router

Matrix

0036-valid-sudoku
0037-sudoku-solver
0048-rotate-image
0417-pacific-atlantic-water-flow
0498-diagonal-traverse
3733-length-of-longest-v-shaped-diagonal-segment

Simulation

0498-diagonal-traverse
1642-water-bottles
2324-find-triangular-sum-of-an-array
2408-number-of-people-aware-of-a-secret
3336-water-bottles-ii

Tree

0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree

Breadth-First Search

0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree
0417-pacific-atlantic-water-flow

Binary Tree

0107-binary-tree-level-order-traversal-ii
0111-minimum-depth-of-binary-tree

Dynamic Programming

0120-triangle
1111-minimum-score-triangulation-of-polygon
2408-number-of-people-aware-of-a-secret
3733-length-of-longest-v-shaped-diagonal-segment

Memoization

3733-length-of-longest-v-shaped-diagonal-segment

Depth-First Search

0111-minimum-depth-of-binary-tree
0417-pacific-atlantic-water-flow

Hash Table

0036-valid-sudoku
0037-sudoku-solver
0146-lru-cache
1006-vowel-spellchecker
1264-maximum-number-of-words-you-can-type
1834-minimum-number-of-people-to-teach
2023-design-movie-rental-system
2429-design-a-food-rating-system
3678-design-task-manager
3827-implement-router
3872-find-most-frequent-vowel-and-consonant

Backtracking

0037-sudoku-solver

Math

0002-add-two-numbers
0048-rotate-image
0830-largest-triangle-area
1018-largest-perimeter-triangle
1426-find-n-unique-integers-sum-up-to-zero
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1642-water-bottles
2324-find-triangular-sum-of-an-array
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i
3336-water-bottles-ii
3462-vowels-game-in-a-string
3744-minimum-operations-to-make-array-elements-zero

Geometry

0830-largest-triangle-area
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i

Sorting

0015-3sum
0088-merge-sorted-array
1018-largest-perimeter-triangle
2887-sort-vowels-in-a-string
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i

Enumeration

2837-minimum-operations-to-make-the-integer-zero
3277-find-the-number-of-ways-to-place-people-ii
3278-find-the-number-of-ways-to-place-people-i

Two Pointers

0011-container-with-most-water
0015-3sum
0027-remove-element
0088-merge-sorted-array
0165-compare-version-numbers
0443-string-compression

String

0038-count-and-say
0165-compare-version-numbers
0443-string-compression
1006-vowel-spellchecker
1264-maximum-number-of-words-you-can-type
2429-design-a-food-rating-system
2887-sort-vowels-in-a-string
3462-vowels-game-in-a-string
3872-find-most-frequent-vowel-and-consonant

Bit Manipulation

1435-xor-queries-of-a-subarray
2837-minimum-operations-to-make-the-integer-zero
3744-minimum-operations-to-make-array-elements-zero

Brainteaser

2837-minimum-operations-to-make-the-integer-zero
3462-vowels-game-in-a-string

Database

0197-rising-temperature
0570-managers-with-at-least-5-direct-reports
0577-employee-bonus
0584-find-customer-referee
0595-big-countries
0596-classes-with-at-least-5-students
0610-triangle-judgement
0619-biggest-single-number
0620-not-boring-movies
1135-customers-who-bought-all-products
1153-product-sales-analysis-i
1155-product-sales-analysis-iii
1161-project-employees-i
1179-game-play-analysis-i
1245-user-activity-for-the-past-30-days-i
1258-article-views-i
1317-monthly-transactions-i
1390-average-selling-price
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1801-average-time-of-process-per-machine
1827-invalid-tweets
1877-find-followers-count
1882-the-number-of-employees-which-report-to-each-employee
1908-recyclable-and-low-fat-products
1942-primary-department-for-each-employee
2127-employees-whose-manager-left-the-company
2495-number-of-unique-subjects-taught-by-each-teacher

Queue

2408-number-of-people-aware-of-a-secret
3827-implement-router

Greedy

0011-container-with-most-water
1018-largest-perimeter-triangle
1834-minimum-number-of-people-to-teach

Game Theory

3462-vowels-game-in-a-string

Counting

3872-find-most-frequent-vowel-and-consonant

Prefix Sum

1435-xor-queries-of-a-subarray

Linked List

0002-add-two-numbers
0021-merge-two-sorted-lists
0146-lru-cache

Design

0146-lru-cache
2023-design-movie-rental-system
2429-design-a-food-rating-system
3678-design-task-manager
3827-implement-router

Doubly-Linked List

0146-lru-cache

Heap (Priority Queue)

2023-design-movie-rental-system
2429-design-a-food-rating-system
3678-design-task-manager

Ordered Set

2023-design-movie-rental-system
2429-design-a-food-rating-system
3678-design-task-manager
3827-implement-router

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists

Binary Search

3827-implement-router

Combinatorics

2324-find-triangular-sum-of-an-array