LeetCode_DailyChallenge_2025

LeetCode Topics

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0128-longest-consecutive-sequence
0141-linked-list-cycle
0169-majority-element
0205-isomorphic-strings
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0389-find-the-difference
0757-pyramid-transition-matrix
0870-magic-squares-in-grid
0952-word-subsets
1064-smallest-integer-divisible-by-k
1353-find-resultant-array-after-removing-anagrams
1612-avoid-flood-in-the-city
1694-make-sum-divisible-by-p
2059-unique-length-3-palindromic-subsequences
2169-simple-bank-system
2174-next-greater-numerically-balanced-number
2274-keep-multiplying-found-values-by-two
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2661-smallest-missing-non-negative-integer-after-operations
3437-maximum-total-damage-with-spell-casting
3501-delete-nodes-from-linked-list-present-in-array
3581-the-two-sneaky-numbers-of-digitville
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3653-maximum-subarray-sum-with-length-divisible-by-k
3819-count-covered-buildings
3834-minimum-operations-to-convert-all-elements-to-zero
3863-power-grid-maintenance
3885-count-special-triplets
3886-count-number-of-trapezoids-i
3897-count-number-of-trapezoids-ii
3934-coupon-code-validator
4087-maximum-substrings-with-distinct-start
4139-minimum-absolute-distance-between-mirror-pairs

Math

0009-palindrome-number
0013-roman-to-integer
0066-plus-one
0204-count-primes
0231-power-of-two
0268-missing-number
0319-bulb-switcher
0326-power-of-three
0342-power-of-four
0368-largest-divisible-subset
0412-fizz-buzz
0670-maximum-swap
0679-24-game
0867-new-21-game
0870-magic-squares-in-grid
1013-fibonacci-number
1064-smallest-integer-divisible-by-k
1146-greatest-common-divisor-of-strings
1421-find-numbers-with-even-number-of-digits
1630-count-odd-numbers-in-an-interval-range
1636-number-of-substrings-with-only-1s
1642-water-bottles
1817-calculate-money-in-leetcode-bank
2174-next-greater-numerically-balanced-number
2244-number-of-laser-beams-in-a-bank
2251-number-of-ways-to-divide-a-long-corridor
2288-count-operations-to-obtain-zero
2307-replace-non-coprime-numbers-in-array
2661-smallest-missing-non-negative-integer-after-operations
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3336-water-bottles-ii
3476-find-minimum-operations-to-make-all-elements-divisible-by-three
3581-the-two-sneaky-numbers-of-digitville
3676-smallest-number-with-all-set-bits
3704-count-partitions-with-even-sum-difference
3721-count-mentions-per-user
3768-check-if-digits-are-equal-in-string-after-operations-i
3846-minimum-operations-to-make-array-sum-divisible-by-k
3851-find-sum-of-array-product-of-magical-sequences
3864-count-the-number-of-computer-unlocking-permutations
3886-count-number-of-trapezoids-i
3897-count-number-of-trapezoids-ii
4022-minimum-operations-to-equalize-subarrays
4139-minimum-absolute-distance-between-mirror-pairs

String

0003-longest-substring-without-repeating-characters
0013-roman-to-integer
0014-longest-common-prefix
0020-valid-parentheses
0058-length-of-last-word
0071-simplify-path
0205-isomorphic-strings
0242-valid-anagram
0389-find-the-difference
0412-fizz-buzz
0474-ones-and-zeroes
0757-pyramid-transition-matrix
0812-rotate-string
0952-word-subsets
0981-delete-columns-to-make-sorted
0992-delete-columns-to-make-sorted-ii
1146-greatest-common-divisor-of-strings
1353-find-resultant-array-after-removing-anagrams
1636-number-of-substrings-with-only-1s
1700-minimum-time-to-make-rope-colorful
1737-maximum-nesting-depth-of-the-parentheses
1747-lexicographically-smallest-string-after-applying-operations
1894-merge-strings-alternately
2059-unique-length-3-palindromic-subsequences
2137-final-value-of-variable-after-performing-operations
2244-number-of-laser-beams-in-a-bank
2251-number-of-ways-to-divide-a-long-corridor
2317-count-collisions-on-a-road
2429-design-a-food-rating-system
2576-minimum-penalty-for-a-shop
2727-number-of-senior-citizens
3233-maximize-the-number-of-partitions-after-operations
3479-count-the-number-of-substrings-with-dominant-ones
3493-maximum-number-of-operations-to-move-ones-to-the-end
3768-check-if-digits-are-equal-in-string-after-operations-i
3934-coupon-code-validator
4087-maximum-substrings-with-distinct-start

Array

0001-two-sum
0011-container-with-most-water
0014-longest-common-prefix
0027-remove-element
0034-find-first-and-last-position-of-element-in-sorted-array
0053-maximum-subarray
0056-merge-intervals
0066-plus-one
0088-merge-sorted-array
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0128-longest-consecutive-sequence
0136-single-number
0137-single-number-ii
0169-majority-element
0200-number-of-islands
0204-count-primes
0217-contains-duplicate
0268-missing-number
0283-move-zeroes
0334-increasing-triplet-subsequence
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0474-ones-and-zeroes
0485-max-consecutive-ones
0679-24-game
0682-baseball-game
0717-1-bit-and-2-bit-characters
0759-set-intersection-size-at-least-two
0794-swim-in-rising-water
0854-making-a-large-island
0870-magic-squares-in-grid
0952-word-subsets
0954-maximum-sum-circular-subarray
0981-delete-columns-to-make-sorted
0992-delete-columns-to-make-sorted-ii
1019-squares-of-a-sorted-array
1071-binary-prefix-divisible-by-5
1168-duplicate-zeros
1353-find-resultant-array-after-removing-anagrams
1388-greatest-sum-divisible-by-three
1421-find-numbers-with-even-number-of-digits
1476-count-negative-numbers-in-a-sorted-matrix
1528-kids-with-the-greatest-number-of-candies
1548-check-if-all-1s-are-at-least-length-k-places-away
1552-build-an-array-with-stack-operations
1603-running-sum-of-1d-array
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1694-make-sum-divisible-by-p
1700-minimum-time-to-make-rope-colorful
1791-richest-customer-wealth
2058-concatenation-of-array
2101-last-day-where-you-can-still-cross
2137-final-value-of-variable-after-performing-operations
2164-two-best-non-overlapping-events
2169-simple-bank-system
2244-number-of-laser-beams-in-a-bank
2263-maximum-running-time-of-n-computers
2274-keep-multiplying-found-values-by-two
2307-replace-non-coprime-numbers-in-array
2343-count-unguarded-cells-in-the-grid
2392-successful-pairs-of-spells-and-potions
2429-design-a-food-rating-system
2479-meeting-rooms-iii
2521-paths-in-matrix-whose-sum-is-divisible-by-k
2618-maximize-the-minimum-powered-city
2625-increment-submatrices-by-one
2661-smallest-missing-non-negative-integer-after-operations
2727-number-of-senior-citizens
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3251-maximum-area-of-longest-diagonal-rectangle
3334-apple-redistribution-into-boxes
3351-maximize-happiness-of-selected-children
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3383-taking-maximum-energy-from-the-mystic-dungeon
3437-maximum-total-damage-with-spell-casting
3476-find-minimum-operations-to-make-all-elements-divisible-by-three
3501-delete-nodes-from-linked-list-present-in-array
3581-the-two-sneaky-numbers-of-digitville
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3612-adjacent-increasing-subarrays-detection-i
3616-make-array-elements-equal-to-zero
3619-adjacent-increasing-subarrays-detection-ii
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3653-maximum-subarray-sum-with-length-divisible-by-k
3704-count-partitions-with-even-sum-difference
3721-count-mentions-per-user
3794-find-the-minimum-amount-of-time-to-brew-potions
3819-count-covered-buildings
3834-minimum-operations-to-convert-all-elements-to-zero
3835-count-partitions-with-max-min-difference-at-most-k
3846-minimum-operations-to-make-array-sum-divisible-by-k
3851-find-sum-of-array-product-of-magical-sequences
3854-maximum-profit-from-trading-stocks-with-discounts
3863-power-grid-maintenance
3864-count-the-number-of-computer-unlocking-permutations
3885-count-special-triplets
3886-count-number-of-trapezoids-i
3892-best-time-to-buy-and-sell-stock-v
3897-count-number-of-trapezoids-ii
3934-coupon-code-validator
3980-best-time-to-buy-and-sell-stock-using-strategy
4022-minimum-operations-to-equalize-subarrays
4139-minimum-absolute-distance-between-mirror-pairs
4141-count-elements-with-at-least-k-greater-values

Dynamic Programming

0053-maximum-subarray
0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock
0368-largest-divisible-subset
0474-ones-and-zeroes
0867-new-21-game
0954-maximum-sum-circular-subarray
1013-fibonacci-number
1388-greatest-sum-divisible-by-three
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
1732-minimum-one-bit-operations-to-make-integers-zero
2164-two-best-non-overlapping-events
2251-number-of-ways-to-divide-a-long-corridor
2521-paths-in-matrix-whose-sum-is-divisible-by-k
3233-maximize-the-number-of-partitions-after-operations
3437-maximum-total-damage-with-spell-casting
3835-count-partitions-with-max-min-difference-at-most-k
3851-find-sum-of-array-product-of-magical-sequences
3854-maximum-profit-from-trading-stocks-with-discounts
3892-best-time-to-buy-and-sell-stock-v

Two Pointers

0011-container-with-most-water
0019-remove-nth-node-from-end-of-list
0027-remove-element
0088-merge-sorted-array
0141-linked-list-cycle
0283-move-zeroes
0349-intersection-of-two-arrays
0908-middle-of-the-linked-list
1019-squares-of-a-sorted-array
1168-duplicate-zeros
1894-merge-strings-alternately
2392-successful-pairs-of-spells-and-potions
3437-maximum-total-damage-with-spell-casting

Sorting

0056-merge-intervals
0088-merge-sorted-array
0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0349-intersection-of-two-arrays
0368-largest-divisible-subset
0389-find-the-difference
0759-set-intersection-size-at-least-two
1019-squares-of-a-sorted-array
1353-find-resultant-array-after-removing-anagrams
1388-greatest-sum-divisible-by-three
2164-two-best-non-overlapping-events
2213-find-all-people-with-secret
2263-maximum-running-time-of-n-computers
2274-keep-multiplying-found-values-by-two
2392-successful-pairs-of-spells-and-potions
2479-meeting-rooms-iii
3334-apple-redistribution-into-boxes
3351-maximize-happiness-of-selected-children
3437-maximum-total-damage-with-spell-casting
3620-maximum-number-of-distinct-elements-after-operations
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3721-count-mentions-per-user
3819-count-covered-buildings
3934-coupon-code-validator
4141-count-elements-with-at-least-k-greater-values

Simulation

0412-fizz-buzz
0682-baseball-game
1552-build-an-array-with-stack-operations
1642-water-bottles
2058-concatenation-of-array
2137-final-value-of-variable-after-performing-operations
2169-simple-bank-system
2274-keep-multiplying-found-values-by-two
2288-count-operations-to-obtain-zero
2317-count-collisions-on-a-road
2343-count-unguarded-cells-in-the-grid
2479-meeting-rooms-iii
3336-water-bottles-ii
3616-make-array-elements-equal-to-zero
3721-count-mentions-per-user
3768-check-if-digits-are-equal-in-string-after-operations-i
3794-find-the-minimum-amount-of-time-to-brew-potions

Breadth-First Search

0200-number-of-islands
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0684-redundant-connection
0794-swim-in-rising-water
0820-find-eventual-safe-states
0854-making-a-large-island
1747-lexicographically-smallest-string-after-applying-operations
2101-last-day-where-you-can-still-cross
2213-find-all-people-with-secret
3863-power-grid-maintenance

Heap (Priority Queue)

0407-trapping-rain-water-ii
0794-swim-in-rising-water
1612-avoid-flood-in-the-city
2164-two-best-non-overlapping-events
2429-design-a-food-rating-system
2479-meeting-rooms-iii
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3863-power-grid-maintenance

Matrix

0200-number-of-islands
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0794-swim-in-rising-water
0854-making-a-large-island
0870-magic-squares-in-grid
1476-count-negative-numbers-in-a-sorted-matrix
1791-richest-customer-wealth
2101-last-day-where-you-can-still-cross
2244-number-of-laser-beams-in-a-bank
2343-count-unguarded-cells-in-the-grid
2521-paths-in-matrix-whose-sum-is-divisible-by-k
2625-increment-submatrices-by-one

Greedy

0011-container-with-most-water
0334-increasing-triplet-subsequence
0670-maximum-swap
0759-set-intersection-size-at-least-two
0992-delete-columns-to-make-sorted-ii
1388-greatest-sum-divisible-by-three
1612-avoid-flood-in-the-city
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1700-minimum-time-to-make-rope-colorful
2263-maximum-running-time-of-n-computers
2618-maximize-the-minimum-powered-city
2661-smallest-missing-non-negative-integer-after-operations
3334-apple-redistribution-into-boxes
3351-maximize-happiness-of-selected-children
3493-maximum-number-of-operations-to-move-ones-to-the-end
3620-maximum-number-of-distinct-elements-after-operations
3834-minimum-operations-to-convert-all-elements-to-zero

Depth-First Search

0200-number-of-islands
0386-lexicographical-numbers
0417-pacific-atlantic-water-flow
0684-redundant-connection
0775-n-ary-tree-preorder-traversal
0794-swim-in-rising-water
0820-find-eventual-safe-states
0854-making-a-large-island
1747-lexicographically-smallest-string-after-applying-operations
2101-last-day-where-you-can-still-cross
2213-find-all-people-with-secret
3058-maximum-number-of-k-divisible-components
3854-maximum-profit-from-trading-stocks-with-discounts
3863-power-grid-maintenance

Binary Search

0034-find-first-and-last-position-of-element-in-sorted-array
0268-missing-number
0349-intersection-of-two-arrays
0794-swim-in-rising-water
1476-count-negative-numbers-in-a-sorted-matrix
1612-avoid-flood-in-the-city
2101-last-day-where-you-can-still-cross
2164-two-best-non-overlapping-events
2263-maximum-running-time-of-n-computers
2392-successful-pairs-of-spells-and-potions
2618-maximize-the-minimum-powered-city
3437-maximum-total-damage-with-spell-casting
3619-adjacent-increasing-subarrays-detection-ii
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
4022-minimum-operations-to-equalize-subarrays
4141-count-elements-with-at-least-k-greater-values

Union Find

0128-longest-consecutive-sequence
0200-number-of-islands
0684-redundant-connection
0794-swim-in-rising-water
0854-making-a-large-island
2101-last-day-where-you-can-still-cross
2213-find-all-people-with-secret
3863-power-grid-maintenance

Trie

0014-longest-common-prefix
0386-lexicographical-numbers

Prefix Sum

1603-running-sum-of-1d-array
1694-make-sum-divisible-by-p
2059-unique-length-3-palindromic-subsequences
2576-minimum-penalty-for-a-shop
2618-maximize-the-minimum-powered-city
2625-increment-submatrices-by-one
3383-taking-maximum-energy-from-the-mystic-dungeon
3616-make-array-elements-equal-to-zero
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3653-maximum-subarray-sum-with-length-divisible-by-k
3704-count-partitions-with-even-sum-difference
3794-find-the-minimum-amount-of-time-to-brew-potions
3835-count-partitions-with-max-min-difference-at-most-k
3980-best-time-to-buy-and-sell-stock-using-strategy

Counting

0169-majority-element
2174-next-greater-numerically-balanced-number
3437-maximum-total-damage-with-spell-casting
3493-maximum-number-of-operations-to-move-ones-to-the-end
3885-count-special-triplets

Bit Manipulation

0136-single-number
0137-single-number-ii
0231-power-of-two
0268-missing-number
0342-power-of-four
0389-find-the-difference
0757-pyramid-transition-matrix
1071-binary-prefix-divisible-by-5
1732-minimum-one-bit-operations-to-make-integers-zero
2059-unique-length-3-palindromic-subsequences
3233-maximize-the-number-of-partitions-after-operations
3676-smallest-number-with-all-set-bits
3851-find-sum-of-array-product-of-magical-sequences

Combinatorics

3768-check-if-digits-are-equal-in-string-after-operations-i
3851-find-sum-of-array-product-of-magical-sequences
3864-count-the-number-of-computer-unlocking-permutations

Bitmask

3233-maximize-the-number-of-partitions-after-operations
3851-find-sum-of-array-product-of-magical-sequences

Stack

0020-valid-parentheses
0071-simplify-path
0682-baseball-game
0775-n-ary-tree-preorder-traversal
1552-build-an-array-with-stack-operations
1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
1737-maximum-nesting-depth-of-the-parentheses
2307-replace-non-coprime-numbers-in-array
2317-count-collisions-on-a-road
3834-minimum-operations-to-convert-all-elements-to-zero

Sliding Window

0003-longest-substring-without-repeating-characters
0867-new-21-game
2618-maximize-the-minimum-powered-city
3479-count-the-number-of-substrings-with-dominant-ones
3592-find-x-sum-of-all-k-long-subarrays-ii
3610-find-x-sum-of-all-k-long-subarrays-i
3622-maximum-frequency-of-an-element-after-performing-operations-i
3640-maximum-frequency-of-an-element-after-performing-operations-ii
3835-count-partitions-with-max-min-difference-at-most-k
3980-best-time-to-buy-and-sell-stock-using-strategy

Enumeration

0204-count-primes
1747-lexicographically-smallest-string-after-applying-operations
2174-next-greater-numerically-balanced-number
3479-count-the-number-of-substrings-with-dominant-ones

Number Theory

0204-count-primes
2307-replace-non-coprime-numbers-in-array
2753-minimum-number-of-operations-to-make-all-array-elements-equal-to-1
3768-check-if-digits-are-equal-in-string-after-operations-i

Recursion

0021-merge-two-sorted-lists
0231-power-of-two
0326-power-of-three
0342-power-of-four
1013-fibonacci-number

Backtracking

0679-24-game
0757-pyramid-transition-matrix
2174-next-greater-numerically-balanced-number

Graph

0684-redundant-connection
0820-find-eventual-safe-states
2213-find-all-people-with-secret
3863-power-grid-maintenance

String Matching

0812-rotate-string

Topological Sort

0820-find-eventual-safe-states

Probability and Statistics

0867-new-21-game

Design

2169-simple-bank-system
2429-design-a-food-rating-system

Ordered Set

2429-design-a-food-rating-system
3863-power-grid-maintenance

Divide and Conquer

0053-maximum-subarray
0169-majority-element
0954-maximum-sum-circular-subarray
4141-count-elements-with-at-least-k-greater-values

Queue

0954-maximum-sum-circular-subarray
2618-maximize-the-minimum-powered-city
3835-count-partitions-with-max-min-difference-at-most-k

Monotonic Queue

0954-maximum-sum-circular-subarray
3835-count-partitions-with-max-min-difference-at-most-k

Memoization

1013-fibonacci-number
1732-minimum-one-bit-operations-to-make-integers-zero

Brainteaser

0319-bulb-switcher
3864-count-the-number-of-computer-unlocking-permutations

Linked List

0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0141-linked-list-cycle
0908-middle-of-the-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Monotonic Stack

1633-minimum-number-of-increments-on-subarrays-to-form-a-target-array
3834-minimum-operations-to-convert-all-elements-to-zero

Tree

0775-n-ary-tree-preorder-traversal
3058-maximum-number-of-k-divisible-components
3854-maximum-profit-from-trading-stocks-with-discounts

Geometry

3886-count-number-of-trapezoids-i
3897-count-number-of-trapezoids-ii

Quickselect

4141-count-elements-with-at-least-k-greater-values

Segment Tree

4022-minimum-operations-to-equalize-subarrays

Database

0175-combine-two-tables
0176-second-highest-salary
0584-find-customer-referee
0595-big-countries
1258-article-views-i
1827-invalid-tweets
1908-recyclable-and-low-fat-products