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LeetCode-Practices

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub.

Two Pointers

0853-most-profit-assigning-work
2572-append-characters-to-string-to-make-subsequence

String

2572-append-characters-to-string-to-make-subsequence

Greedy

0330-patching-array
0853-most-profit-assigning-work
2572-append-characters-to-string-to-make-subsequence

Array

0330-patching-array
0853-most-profit-assigning-work
1370-count-number-of-nice-subarrays

Binary Search

0853-most-profit-assigning-work

Sorting

0853-most-profit-assigning-work

Hash Table

1370-count-number-of-nice-subarrays

Math

1370-count-number-of-nice-subarrays

Sliding Window

1370-count-number-of-nice-subarrays

LeetCode Topics

Linked List

2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2299-merge-nodes-in-between-zeros

Simulation

2006-find-the-student-that-will-replace-the-chalk
2021-remove-all-occurrences-of-a-substring
2076-sum-of-digits-of-string-after-convert
2299-merge-nodes-in-between-zeros
2551-apply-operations-to-an-array
2645-pass-the-pillow
3332-minimum-operations-to-exceed-threshold-value-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits

Math

0264-ugly-number-ii
1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1889-check-if-number-is-a-sum-of-powers-of-three
2448-count-number-of-bad-pairs
2610-closest-prime-numbers-in-range
2645-pass-the-pillow
2649-count-total-number-of-colored-cells
2802-find-the-punishment-number-of-an-integer
3227-find-missing-and-repeated-values

Array

0494-target-sum
0854-making-a-large-island
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1025-minimum-cost-for-tickets
1364-tuple-with-same-product
1396-count-servers-that-communicate
1477-product-of-the-last-k-numbers
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1524-string-matching-in-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1631-number-of-sub-arrays-with-odd-sum
1819-construct-the-lexicographically-largest-valid-sequence
1849-maximum-absolute-sum-of-any-subarray
1876-map-of-highest-peak
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1927-maximum-ascending-subarray-sum
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2107-find-unique-binary-string
2255-minimum-swaps-to-group-all-1s-together-ii
2292-counting-words-with-a-given-prefix
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2533-bitwise-xor-of-all-pairings
2551-apply-operations-to-an-array
2665-minimum-time-to-repair-cars
2685-first-completely-painted-row-or-column
2690-house-robber-iv
2707-merge-two-2d-arrays-by-summing-values
2727-number-of-senior-citizens
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3219-make-lexicographically-smallest-array-by-swapping-elements
3227-find-missing-and-repeated-values
3309-count-prefix-and-suffix-pairs-i
3332-minimum-operations-to-exceed-threshold-value-ii
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3429-special-array-i
3434-find-the-number-of-distinct-colors-among-the-balls
3483-alternating-groups-ii

String

1093-recover-a-tree-from-preorder-traversal
1160-letter-tile-possibilities
1502-construct-k-palindrome-strings
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1524-string-matching-in-an-array
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2076-sum-of-digits-of-string-after-convert
2107-find-unique-binary-string
2221-check-if-a-parentheses-string-can-be-valid
2292-counting-words-with-a-given-prefix
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2727-number-of-senior-citizens
3309-count-prefix-and-suffix-pairs-i
3447-clear-digits
3455-minimum-length-of-string-after-operations
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Sliding Window

2255-minimum-swaps-to-group-all-1s-together-ii
2463-minimum-recolors-to-get-k-consecutive-black-blocks
3483-alternating-groups-ii
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Hash Table

0264-ugly-number-ii
0905-length-of-longest-fibonacci-subsequence
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0984-most-stones-removed-with-same-row-or-column
1160-letter-tile-possibilities
1364-tuple-with-same-product
1387-find-elements-in-a-contaminated-binary-tree
1502-construct-k-palindrome-strings
1556-make-two-arrays-equal-by-reversing-subarrays
1915-check-if-one-string-swap-can-make-strings-equal
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2685-first-completely-painted-row-or-column
2707-merge-two-2d-arrays-by-summing-values
2766-find-the-prefix-common-array-of-two-arrays
3227-find-missing-and-repeated-values
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Sorting

1556-make-two-arrays-equal-by-reversing-subarrays
2473-max-sum-of-a-pair-with-equal-sum-of-digits
3219-make-lexicographically-smallest-array-by-swapping-elements

Dynamic Programming

0264-ugly-number-ii
0494-target-sum
0905-length-of-longest-fibonacci-subsequence
1025-minimum-cost-for-tickets
1631-number-of-sub-arrays-with-odd-sum
1849-maximum-absolute-sum-of-any-subarray

Heap (Priority Queue)

0264-ugly-number-ii
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
3332-minimum-operations-to-exceed-threshold-value-ii

Bit Manipulation

0476-number-complement
2059-unique-length-3-palindromic-subsequences
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor

Depth-First Search

0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1558-course-schedule-iv
2035-count-sub-islands
2246-maximum-employees-to-be-invited-to-a-meeting
2764-maximum-number-of-fish-in-a-grid

Breadth-First Search

0684-redundant-connection
0820-find-eventual-safe-states
0854-making-a-large-island
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
1876-map-of-highest-peak
2035-count-sub-islands
2583-divide-nodes-into-the-maximum-number-of-groups
2764-maximum-number-of-fish-in-a-grid

Union Find

0684-redundant-connection
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
1396-count-servers-that-communicate
2035-count-sub-islands
2583-divide-nodes-into-the-maximum-number-of-groups
2764-maximum-number-of-fish-in-a-grid
3219-make-lexicographically-smallest-array-by-swapping-elements

Matrix

0854-making-a-large-island
1396-count-servers-that-communicate
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1876-map-of-highest-peak
2035-count-sub-islands
2685-first-completely-painted-row-or-column
2764-maximum-number-of-fish-in-a-grid
3227-find-missing-and-repeated-values

Graph

0684-redundant-connection
0820-find-eventual-safe-states
0984-most-stones-removed-with-same-row-or-column
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1558-course-schedule-iv
2246-maximum-employees-to-be-invited-to-a-meeting
2583-divide-nodes-into-the-maximum-number-of-groups

Binary Search

2006-find-the-student-that-will-replace-the-chalk
2665-minimum-time-to-repair-cars
2690-house-robber-iv

Prefix Sum

1477-product-of-the-last-k-numbers
1631-number-of-sub-arrays-with-odd-sum
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
2006-find-the-student-that-will-replace-the-chalk
2059-unique-length-3-palindromic-subsequences

Backtracking

0494-target-sum
1160-letter-tile-possibilities
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1819-construct-the-lexicographically-largest-valid-sequence
2107-find-unique-binary-string
2802-find-the-punishment-number-of-an-integer

String Matching

1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Trie

3309-count-prefix-and-suffix-pairs-i

Rolling Hash

3309-count-prefix-and-suffix-pairs-i

Hash Function

3309-count-prefix-and-suffix-pairs-i

Greedy

1502-construct-k-palindrome-strings
2221-check-if-a-parentheses-string-can-be-valid
2509-minimize-xor

Counting

1160-letter-tile-possibilities
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1915-check-if-one-string-swap-can-make-strings-equal
2448-count-number-of-bad-pairs
3455-minimum-length-of-string-after-operations

Stack

2021-remove-all-occurrences-of-a-substring
2221-check-if-a-parentheses-string-can-be-valid
3447-clear-digits

Brainteaser

2533-bitwise-xor-of-all-pairings

Shortest Path

1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid

Topological Sort

0820-find-eventual-safe-states
1558-course-schedule-iv
2246-maximum-employees-to-be-invited-to-a-meeting

Design

1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
2434-design-a-number-container-system

Ordered Set

2434-design-a-number-container-system

Data Stream

1477-product-of-the-last-k-numbers

Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree

Binary Tree

0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1387-find-elements-in-a-contaminated-binary-tree

Divide and Conquer

0925-construct-binary-tree-from-preorder-and-postorder-traversal

Two Pointers

2551-apply-operations-to-an-array
2707-merge-two-2d-arrays-by-summing-values

Number Theory

2610-closest-prime-numbers-in-range

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