LeetCode

Tracking my LeetCode progress and problem-solving journey.

LeetCode Topics

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0013-roman-to-integer
0029-divide-two-integers
0048-rotate-image
0050-powx-n
0067-add-binary
0189-rotate-array
0202-happy-number
0204-count-primes
0231-power-of-two
0263-ugly-number
0509-fibonacci-number
1903-largest-odd-number-in-string
1922-count-good-numbers
3658-gcd-of-odd-and-even-sums

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0876-middle-of-the-linked-list
2095-delete-the-middle-node-of-a-linked-list

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0050-powx-n
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0509-fibonacci-number
1922-count-good-numbers

Hash Table

0001-two-sum
0013-roman-to-integer
0073-set-matrix-zeroes
0128-longest-consecutive-sequence
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0160-intersection-of-two-linked-lists
0169-majority-element
0202-happy-number
0205-isomorphic-strings
0229-majority-element-ii
0242-valid-anagram
0451-sort-characters-by-frequency
0496-next-greater-element-i
0560-subarray-sum-equals-k

String

0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0067-add-binary
0125-valid-palindrome
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0451-sort-characters-by-frequency
0796-rotate-string
1021-remove-outermost-parentheses
1614-maximum-nesting-depth-of-the-parentheses
1903-largest-odd-number-in-string

Stack

0020-valid-parentheses
0094-binary-tree-inorder-traversal
0225-implement-stack-using-queues
0234-palindrome-linked-list
0496-next-greater-element-i
1021-remove-outermost-parentheses
1614-maximum-nesting-depth-of-the-parentheses

Tree

0094-binary-tree-inorder-traversal

Depth-First Search

0094-binary-tree-inorder-traversal

Binary Tree

0094-binary-tree-inorder-traversal

Two Pointers

0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0061-rotate-list
0075-sort-colors
0088-merge-sorted-array
0125-valid-palindrome
0141-linked-list-cycle
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0189-rotate-array
0202-happy-number
0234-palindrome-linked-list
0283-move-zeroes
0876-middle-of-the-linked-list
2095-delete-the-middle-node-of-a-linked-list
2149-rearrange-array-elements-by-sign

Bit Manipulation

0029-divide-two-integers
0067-add-binary
0078-subsets
0136-single-number
0231-power-of-two
0461-hamming-distance
2220-minimum-bit-flips-to-convert-number

Simulation

0054-spiral-matrix
0067-add-binary
2149-rearrange-array-elements-by-sign

Number Theory

0204-count-primes
3658-gcd-of-odd-and-even-sums

Dynamic Programming

0053-maximum-subarray
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0410-split-array-largest-sum
0509-fibonacci-number

Memoization

0509-fibonacci-number

Array

0001-two-sum
0014-longest-common-prefix
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0031-next-permutation
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0048-rotate-image
0053-maximum-subarray
0054-spiral-matrix
0056-merge-intervals
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0081-search-in-rotated-sorted-array-ii
0088-merge-sorted-array
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0169-majority-element
0189-rotate-array
0204-count-primes
0229-majority-element-ii
0240-search-a-2d-matrix-ii
0283-move-zeroes
0410-split-array-largest-sum
0485-max-consecutive-ones
0493-reverse-pairs
0496-next-greater-element-i
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0704-binary-search
0875-koko-eating-bananas
1011-capacity-to-ship-packages-within-d-days
1283-find-the-smallest-divisor-given-a-threshold
1482-minimum-number-of-days-to-make-m-bouquets
1539-kth-missing-positive-number
1752-check-if-array-is-sorted-and-rotated
1901-find-a-peak-element-ii
2149-rearrange-array-elements-by-sign

Sorting

0015-3sum
0018-4sum
0056-merge-intervals
0075-sort-colors
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0229-majority-element-ii
0242-valid-anagram
0451-sort-characters-by-frequency

Divide and Conquer

0053-maximum-subarray
0148-sort-list
0169-majority-element
0240-search-a-2d-matrix-ii
0493-reverse-pairs

Counting

0169-majority-element
0229-majority-element-ii
0451-sort-characters-by-frequency

Union-Find

0128-longest-consecutive-sequence

Matrix

0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0240-search-a-2d-matrix-ii
1901-find-a-peak-element-ii

Prefix Sum

0410-split-array-largest-sum
0560-subarray-sum-equals-k

Boyer–Moore Majority Vote Algorithm

0229-majority-element-ii

Quicksort

0056-merge-intervals

Binary Search

0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0240-search-a-2d-matrix-ii
0410-split-array-largest-sum
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0704-binary-search
0875-koko-eating-bananas
1011-capacity-to-ship-packages-within-d-days
1283-find-the-smallest-divisor-given-a-threshold
1482-minimum-number-of-days-to-make-m-bouquets
1539-kth-missing-positive-number
1901-find-a-peak-element-ii

Binary Indexed Tree

0493-reverse-pairs

Segment Tree

0493-reverse-pairs

Merge Sort

0148-sort-list
0493-reverse-pairs

Ordered Set

0493-reverse-pairs

Treap

0493-reverse-pairs

Greedy

0410-split-array-largest-sum
1903-largest-odd-number-in-string

Bracket Sequences

0020-valid-parentheses
1021-remove-outermost-parentheses
1614-maximum-nesting-depth-of-the-parentheses

Trie

0014-longest-common-prefix

String Matching

0796-rotate-string

Heap (Priority Queue)

0451-sort-characters-by-frequency

Bucket Sort

0451-sort-characters-by-frequency

Backtracking

0078-subsets

Enumeration

0204-count-primes

Primality Test

0204-count-primes

Sieve Theory

0204-count-primes

Prime Number Sieve

0204-count-primes

Floyd's Cycle Finding Algorithm

0141-linked-list-cycle

Design

0225-implement-stack-using-queues

Queue

0225-implement-stack-using-queues

Monotonic Stack

0496-next-greater-element-i