leetcode-solutions

LeetCode Topics

Depth-First Search

0094-binary-tree-inorder-traversal
0129-sum-root-to-leaf-numbers
0200-number-of-islands
0386-lexicographical-numbers
1022-sum-of-root-to-leaf-binary-numbers

Trie

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

Array

0001-two-sum
0014-longest-common-prefix
0179-largest-number
0200-number-of-islands
0448-find-all-numbers-disappeared-in-an-array
0704-binary-search
0896-monotonic-array
1331-rank-transform-of-an-array
1748-sum-of-unique-elements
1800-maximum-ascending-subarray-sum
1822-sign-of-the-product-of-an-array
2016-maximum-difference-between-increasing-elements
2418-sort-the-people
2442-count-number-of-distinct-integers-after-reverse-operations
2455-average-value-of-even-numbers-that-are-divisible-by-three
2461-maximum-sum-of-distinct-subarrays-with-length-k
2540-minimum-common-value
2553-separate-the-digits-in-an-array
3162-find-the-number-of-good-pairs-i
3591-check-if-any-element-has-prime-frequency
3697-compute-decimal-representation
3718-smallest-missing-multiple-of-k
3769-sort-integers-by-binary-reflection
3842-toggle-light-bulbs
3843-first-element-with-unique-frequency
3866-first-unique-even-element

String

0014-longest-common-prefix
0179-largest-number
0345-reverse-vowels-of-a-string
0415-add-strings
1446-consecutive-characters
2418-sort-the-people
2864-maximum-odd-binary-number
3211-generate-binary-strings-without-adjacent-zeros
3442-maximum-difference-between-even-and-odd-frequency-i

Tree

0094-binary-tree-inorder-traversal
0129-sum-root-to-leaf-numbers
1022-sum-of-root-to-leaf-binary-numbers

Binary Tree

0094-binary-tree-inorder-traversal
0129-sum-root-to-leaf-numbers
1022-sum-of-root-to-leaf-binary-numbers

Database

0175-combine-two-tables
0178-rank-scores
0181-employees-earning-more-than-their-managers
0182-duplicate-emails
0183-customers-who-never-order
0184-department-highest-salary
0511-game-play-analysis-i
0586-customer-placing-the-largest-number-of-orders
0607-sales-person
0608-tree-node
0627-swap-sex-of-employees
1050-actors-and-directors-who-cooperated-at-least-three-times
1084-sales-analysis-iii
1158-market-analysis-i
1179-reformat-department-table
1407-top-travellers
1587-bank-account-summary-ii
1693-daily-leads-and-partners
1741-find-total-time-spent-by-each-employee
1795-rearrange-products-table
1873-calculate-special-bonus
1890-the-latest-login-in-2020
1965-employees-with-missing-information
3220-odd-and-even-transactions
3421-find-students-who-improved
3465-find-products-with-valid-serial-numbers
3564-seasonal-sales-analysis
3570-find-books-with-no-available-copies
3601-find-drivers-with-improved-fuel-efficiency

Math

0007-reverse-integer
0263-ugly-number
0415-add-strings
1185-day-of-the-week
1281-subtract-the-product-and-sum-of-digits-of-an-integer
1317-convert-integer-to-the-sum-of-two-no-zero-integers
1822-sign-of-the-product-of-an-array
2442-count-number-of-distinct-integers-after-reverse-operations
2455-average-value-of-even-numbers-that-are-divisible-by-three
2485-find-the-pivot-integer
2520-count-the-digits-that-divide-a-number
2652-sum-multiples
2864-maximum-odd-binary-number
3370-smallest-number-with-all-set-bits
3536-maximum-product-of-two-digits
3591-check-if-any-element-has-prime-frequency
3697-compute-decimal-representation
3754-concatenate-non-zero-digits-and-multiply-by-sum-i

Hash Table

0001-two-sum
0448-find-all-numbers-disappeared-in-an-array
1331-rank-transform-of-an-array
1748-sum-of-unique-elements
2418-sort-the-people
2442-count-number-of-distinct-integers-after-reverse-operations
2461-maximum-sum-of-distinct-subarrays-with-length-k
2540-minimum-common-value
3162-find-the-number-of-good-pairs-i
3442-maximum-difference-between-even-and-odd-frequency-i
3591-check-if-any-element-has-prime-frequency
3718-smallest-missing-multiple-of-k
3842-toggle-light-bulbs
3843-first-element-with-unique-frequency
3866-first-unique-even-element

Counting

1748-sum-of-unique-elements
2442-count-number-of-distinct-integers-after-reverse-operations
3442-maximum-difference-between-even-and-odd-frequency-i
3591-check-if-any-element-has-prime-frequency
3843-first-element-with-unique-frequency
3866-first-unique-even-element

Simulation

0415-add-strings
2553-separate-the-digits-in-an-array
3842-toggle-light-bulbs

Two Pointers

0345-reverse-vowels-of-a-string
2540-minimum-common-value

Prefix Sum

2485-find-the-pivot-integer

Sorting

0179-largest-number
1331-rank-transform-of-an-array
2418-sort-the-people
3536-maximum-product-of-two-digits
3769-sort-integers-by-binary-reflection
3842-toggle-light-bulbs

Bit Manipulation

3211-generate-binary-strings-without-adjacent-zeros
3370-smallest-number-with-all-set-bits
3827-count-monobit-integers

Enumeration

1291-sequential-digits
3827-count-monobit-integers

Number Theory

3591-check-if-any-element-has-prime-frequency

Binary Search

0704-binary-search
2540-minimum-common-value

Greedy

0179-largest-number
2864-maximum-odd-binary-number

Backtracking

3211-generate-binary-strings-without-adjacent-zeros

Sliding Window

2461-maximum-sum-of-distinct-subarrays-with-length-k

Breadth-First Search

0200-number-of-islands

Union-Find

0200-number-of-islands

Matrix

0200-number-of-islands

Stack

0094-binary-tree-inorder-traversal