Leetcode

LeetCode Topics

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0048-rotate-image
0070-climbing-stairs
0231-power-of-two
0326-power-of-three
0342-power-of-four
1013-fibonacci-number
1406-subtract-the-product-and-sum-of-digits-of-an-integer
1444-number-of-steps-to-reduce-a-number-to-zero
1635-number-of-good-pairs
1806-count-of-matches-in-tournament
2383-add-two-integers

Linked List

0002-add-two-numbers
0061-rotate-list

Two Pointers

0005-longest-palindromic-substring
0061-rotate-list
0541-reverse-string-ii

Array

0001-two-sum
0048-rotate-image
0053-maximum-subarray
0118-pascals-triangle
0219-contains-duplicate-ii
0495-teemo-attacking
0518-coin-change-ii
0594-longest-harmonious-subsequence
0643-maximum-average-subarray-i
0940-fruit-into-baskets
1350-remove-sub-folders-from-the-filesystem
1482-how-many-numbers-are-smaller-than-the-current-number
1505-create-target-array-in-the-given-order
1524-string-matching-in-an-array
1528-kids-with-the-greatest-number-of-candies
1580-shuffle-the-array
1603-running-sum-of-1d-array
1635-number-of-good-pairs
1791-richest-customer-wealth
2048-build-array-from-permutation
2058-concatenation-of-array
2137-final-value-of-variable-after-performing-operations
2316-count-hills-and-valleys-in-an-array
2529-range-product-queries-of-powers
2589-maximum-value-of-a-string-in-an-array
3461-find-the-minimum-area-to-cover-all-ones-i
3790-fruits-into-baskets-ii

Database

0585-investments-in-2016
0602-friend-requests-ii-who-has-the-most-friends
0626-exchange-seats
1155-product-sales-analysis-iii
1278-product-price-at-a-given-date
1452-restaurant-growth
1480-movie-rating
1801-average-time-of-process-per-machine
2057-count-salary-categories

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0012-integer-to-roman
0013-roman-to-integer
0541-reverse-string-ii
0851-goat-latin
1205-defanging-an-ip-address
1297-maximum-number-of-balloons
1350-remove-sub-folders-from-the-filesystem
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1797-goal-parser-interpretation
1873-longest-nice-substring
2137-final-value-of-variable-after-performing-operations
2177-check-whether-two-strings-are-almost-equivalent
2235-capitalize-the-title
2589-maximum-value-of-a-string-in-an-array
2723-find-the-longest-balanced-substring-of-a-binary-string

String Matching

1524-string-matching-in-an-array

Depth-First Search

1350-remove-sub-folders-from-the-filesystem

Trie

1350-remove-sub-folders-from-the-filesystem

Dynamic Programming

0005-longest-palindromic-substring
0053-maximum-subarray
0070-climbing-stairs
0118-pascals-triangle
0518-coin-change-ii
1013-fibonacci-number

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0219-contains-duplicate-ii
0594-longest-harmonious-subsequence
0940-fruit-into-baskets
1297-maximum-number-of-balloons
1482-how-many-numbers-are-smaller-than-the-current-number
1635-number-of-good-pairs
1873-longest-nice-substring
2177-check-whether-two-strings-are-almost-equivalent

Recursion

0002-add-two-numbers
0231-power-of-two
0326-power-of-three
0342-power-of-four
1013-fibonacci-number

Sliding Window

0003-longest-substring-without-repeating-characters
0219-contains-duplicate-ii
0594-longest-harmonious-subsequence
0643-maximum-average-subarray-i
0940-fruit-into-baskets
1873-longest-nice-substring

Matrix

0048-rotate-image
1791-richest-customer-wealth
3461-find-the-minimum-area-to-cover-all-ones-i

Binary Search

3790-fruits-into-baskets-ii

Segment Tree

3790-fruits-into-baskets-ii

Simulation

0495-teemo-attacking
1505-create-target-array-in-the-given-order
1806-count-of-matches-in-tournament
2048-build-array-from-permutation
2058-concatenation-of-array
2137-final-value-of-variable-after-performing-operations
3790-fruits-into-baskets-ii

Ordered Set

3790-fruits-into-baskets-ii

Memoization

0070-climbing-stairs
1013-fibonacci-number

Bit Manipulation

0231-power-of-two
0342-power-of-four
1444-number-of-steps-to-reduce-a-number-to-zero
1873-longest-nice-substring
2529-range-product-queries-of-powers

Prefix Sum

1537-maximum-score-after-splitting-a-string
1603-running-sum-of-1d-array
2529-range-product-queries-of-powers

Counting

0594-longest-harmonious-subsequence
1297-maximum-number-of-balloons
1635-number-of-good-pairs
2177-check-whether-two-strings-are-almost-equivalent

Sorting

0594-longest-harmonious-subsequence
1482-how-many-numbers-are-smaller-than-the-current-number

Counting Sort

1482-how-many-numbers-are-smaller-than-the-current-number

Stack

0155-min-stack

Design

0155-min-stack

Divide and Conquer

0053-maximum-subarray
1873-longest-nice-substring