DSA-Problems

LeetCode Topics

Hash Table

0003-longest-substring-without-repeating-characters
0424-longest-repeating-character-replacement
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0904-fruit-into-baskets
0930-binary-subarrays-with-sum
1189-maximum-number-of-balloons
1358-number-of-substrings-containing-all-three-characters
1876-substrings-of-size-three-with-distinct-characters
2540-minimum-common-value
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii
3043-find-the-length-of-the-longest-common-prefix
3120-count-the-number-of-special-characters-i
3217-delete-nodes-from-linked-list-present-in-array
3740-minimum-distance-between-three-equal-elements-i
3741-minimum-distance-between-three-equal-elements-ii
3761-minimum-absolute-distance-between-mirror-pairs

String

0003-longest-substring-without-repeating-characters
0028-find-the-index-of-the-first-occurrence-in-a-string
0424-longest-repeating-character-replacement
0657-robot-return-to-origin
0796-rotate-string
1189-maximum-number-of-balloons
1358-number-of-substrings-containing-all-three-characters
1876-substrings-of-size-three-with-distinct-characters
1945-sum-of-digits-of-string-after-convert
2129-capitalize-the-title
2515-shortest-distance-to-target-string-in-a-circular-array
2839-check-if-strings-can-be-made-equal-with-operations-i
2840-check-if-strings-can-be-made-equal-with-operations-ii
3043-find-the-length-of-the-longest-common-prefix
3120-count-the-number-of-special-characters-i
3612-process-string-with-special-operations-i
3838-weighted-word-mapping
3931-check-adjacent-digit-differences

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0424-longest-repeating-character-replacement
0594-longest-harmonious-subsequence
0904-fruit-into-baskets
0930-binary-subarrays-with-sum
1004-max-consecutive-ones-iii
1358-number-of-substrings-containing-all-three-characters
1652-defuse-the-bomb
1876-substrings-of-size-three-with-distinct-characters

Array

0004-median-of-two-sorted-arrays
0048-rotate-image
0078-subsets
0137-single-number-ii
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0260-single-number-iii
0414-third-maximum-number
0455-assign-cookies
0477-total-hamming-distance
0485-max-consecutive-ones
0495-teemo-attacking
0560-subarray-sum-equals-k
0594-longest-harmonious-subsequence
0904-fruit-into-baskets
0930-binary-subarrays-with-sum
1004-max-consecutive-ones-iii
1437-check-if-all-1s-are-at-least-length-k-places-away
1502-can-make-arithmetic-progression-from-sequence
1652-defuse-the-bomb
1833-maximum-ice-cream-bars
1848-minimum-distance-to-the-target-element
1855-maximum-distance-between-a-pair-of-values
1886-determine-whether-matrix-can-be-obtained-by-rotation
1979-find-greatest-common-divisor-of-array
2126-destroying-asteroids
2410-maximum-matching-of-players-with-trainers
2515-shortest-distance-to-target-string-in-a-circular-array
2540-minimum-common-value
2553-separate-the-digits-in-an-array
2784-check-if-array-is-good
2946-matrix-similarity-after-cyclic-shifts
3043-find-the-length-of-the-longest-common-prefix
3217-delete-nodes-from-linked-list-present-in-array
3300-minimum-element-after-replacement-with-digit-sum
3546-equal-sum-grid-partition-i
3643-flip-square-submatrix-vertically
3653-xor-after-range-multiplication-queries-i
3740-minimum-distance-between-three-equal-elements-i
3741-minimum-distance-between-three-equal-elements-ii
3761-minimum-absolute-distance-between-mirror-pairs
3838-weighted-word-mapping

Binary Search

0004-median-of-two-sorted-arrays
0153-find-minimum-in-rotated-sorted-array
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
1004-max-consecutive-ones-iii
1855-maximum-distance-between-a-pair-of-values
2540-minimum-common-value

Prefix Sum

0209-minimum-size-subarray-sum
0560-subarray-sum-equals-k
0930-binary-subarrays-with-sum
1004-max-consecutive-ones-iii
2485-find-the-pivot-integer
3546-equal-sum-grid-partition-i

Sorting

0414-third-maximum-number
0455-assign-cookies
0594-longest-harmonious-subsequence
1502-can-make-arithmetic-progression-from-sequence
1833-maximum-ice-cream-bars
2126-destroying-asteroids
2410-maximum-matching-of-players-with-trainers
2784-check-if-array-is-good
2840-check-if-strings-can-be-made-equal-with-operations-ii

Counting

0594-longest-harmonious-subsequence
1189-maximum-number-of-balloons
1876-substrings-of-size-three-with-distinct-characters

Two Pointers

0028-find-the-index-of-the-first-occurrence-in-a-string
0167-two-sum-ii-input-array-is-sorted
0455-assign-cookies
1855-maximum-distance-between-a-pair-of-values
2095-delete-the-middle-node-of-a-linked-list
2410-maximum-matching-of-players-with-trainers
2540-minimum-common-value
3643-flip-square-submatrix-vertically

Matrix

0048-rotate-image
1886-determine-whether-matrix-can-be-obtained-by-rotation
2946-matrix-similarity-after-cyclic-shifts
3546-equal-sum-grid-partition-i
3643-flip-square-submatrix-vertically

Math

0048-rotate-image
0477-total-hamming-distance
1979-find-greatest-common-divisor-of-array
2169-count-operations-to-obtain-zero
2485-find-the-pivot-integer
2946-matrix-similarity-after-cyclic-shifts
3300-minimum-element-after-replacement-with-digit-sum
3761-minimum-absolute-distance-between-mirror-pairs
3783-mirror-distance-of-an-integer

Enumeration

3546-equal-sum-grid-partition-i

Simulation

0495-teemo-attacking
0657-robot-return-to-origin
1945-sum-of-digits-of-string-after-convert
2169-count-operations-to-obtain-zero
2553-separate-the-digits-in-an-array
2946-matrix-similarity-after-cyclic-shifts
3612-process-string-with-special-operations-i
3653-xor-after-range-multiplication-queries-i
3838-weighted-word-mapping

Stack

0094-binary-tree-inorder-traversal
2487-remove-nodes-from-linked-list

Tree

0094-binary-tree-inorder-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0543-diameter-of-binary-tree

Depth-First Search

0094-binary-tree-inorder-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0543-diameter-of-binary-tree

Binary Tree

0094-binary-tree-inorder-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0543-diameter-of-binary-tree

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0796-rotate-string

Divide and Conquer

0004-median-of-two-sorted-arrays
0191-number-of-1-bits
3653-xor-after-range-multiplication-queries-i

Bit Manipulation

0078-subsets
0137-single-number-ii
0191-number-of-1-bits
0260-single-number-iii
0477-total-hamming-distance

Breadth-First Search

0104-maximum-depth-of-binary-tree

Linked List

0025-reverse-nodes-in-k-group
0092-reverse-linked-list-ii
2095-delete-the-middle-node-of-a-linked-list
2487-remove-nodes-from-linked-list
3217-delete-nodes-from-linked-list-present-in-array

Recursion

0025-reverse-nodes-in-k-group
2487-remove-nodes-from-linked-list

Monotonic Stack

2487-remove-nodes-from-linked-list

Backtracking

0078-subsets

Trie

3043-find-the-length-of-the-longest-common-prefix

Greedy

0455-assign-cookies
1833-maximum-ice-cream-bars
2126-destroying-asteroids
2410-maximum-matching-of-players-with-trainers

Counting Sort

1833-maximum-ice-cream-bars

Database

0182-duplicate-emails
0184-department-highest-salary
0570-managers-with-at-least-5-direct-reports
0577-employee-bonus
0619-biggest-single-number
1581-customer-who-visited-but-did-not-make-any-transactions
1729-find-followers-count

Number Theory

1979-find-greatest-common-divisor-of-array