Leetcode

My leetcode problems

LeetCode Topics

Array

0001-two-sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0035-search-insert-position
0042-trapping-rain-water
0118-pascals-triangle
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0209-minimum-size-subarray-sum
0217-contains-duplicate
0228-summary-ranges
0238-product-of-array-except-self
0349-intersection-of-two-arrays
0566-reshape-the-matrix
0643-maximum-average-subarray-i
0724-find-pivot-index
0811-number-of-subarrays-with-bounded-maximum
0978-valid-mountain-array
1001-n-repeated-element-in-size-2n-array
1137-height-checker
1378-cells-with-odd-values-in-a-matrix
1421-find-numbers-with-even-number-of-digits
1496-lucky-numbers-in-a-matrix
1547-destination-city
1635-number-of-good-pairs
1656-count-good-triplets
1944-truncate-sentence
2048-build-array-from-permutation
2058-concatenation-of-array
2137-final-value-of-variable-after-performing-operations
2219-maximum-number-of-words-found-in-sentences
2292-counting-words-with-a-given-prefix
2308-divide-array-into-equal-pairs
2324-find-triangular-sum-of-an-array
2331-intersection-of-multiple-arrays
2714-left-and-right-sum-differences
2737-row-with-maximum-ones
2836-neither-minimum-nor-maximum
2844-sum-of-squares-of-special-elements
2917-count-pairs-whose-sum-is-less-than-target
3194-find-words-containing-character
3206-find-common-elements-between-two-arrays
3476-find-minimum-operations-to-make-all-elements-divisible-by-three
3581-the-two-sneaky-numbers-of-digitville

Matrix

0566-reshape-the-matrix
1496-lucky-numbers-in-a-matrix
2737-row-with-maximum-ones

Simulation

0566-reshape-the-matrix
0657-robot-return-to-origin
1378-cells-with-odd-values-in-a-matrix
2048-build-array-from-permutation
2058-concatenation-of-array
2137-final-value-of-variable-after-performing-operations
2324-find-triangular-sum-of-an-array
2645-pass-the-pillow

Enumeration

1656-count-good-triplets
2844-sum-of-squares-of-special-elements

String

0003-longest-substring-without-repeating-characters
0014-longest-common-prefix
0020-valid-parentheses
0058-length-of-last-word
0125-valid-palindrome
0151-reverse-words-in-a-string
0242-valid-anagram
0344-reverse-string
0389-find-the-difference
0392-is-subsequence
0451-sort-characters-by-frequency
0520-detect-capital
0657-robot-return-to-origin
1205-defanging-an-ip-address
1341-split-a-string-in-balanced-strings
1547-destination-city
1920-determine-color-of-a-chessboard-square
1944-truncate-sentence
2032-largest-odd-number-in-string
2137-final-value-of-variable-after-performing-operations
2219-maximum-number-of-words-found-in-sentences
2292-counting-words-with-a-given-prefix
3194-find-words-containing-character
3379-score-of-a-string
3412-permutation-difference-between-two-strings
3567-convert-date-to-binary

String Matching

2292-counting-words-with-a-given-prefix

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0141-linked-list-cycle
0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0349-intersection-of-two-arrays
0389-find-the-difference
0451-sort-characters-by-frequency
1001-n-repeated-element-in-size-2n-array
1547-destination-city
1635-number-of-good-pairs
2308-divide-array-into-equal-pairs
2331-intersection-of-multiple-arrays
3206-find-common-elements-between-two-arrays
3412-permutation-difference-between-two-strings
3581-the-two-sneaky-numbers-of-digitville

Math

0009-palindrome-number
0070-climbing-stairs
1013-fibonacci-number
1289-day-of-the-week
1378-cells-with-odd-values-in-a-matrix
1421-find-numbers-with-even-number-of-digits
1635-number-of-good-pairs
1889-check-if-number-is-a-sum-of-powers-of-three
1920-determine-color-of-a-chessboard-square
1965-sum-of-digits-in-base-k
2032-largest-odd-number-in-string
2324-find-triangular-sum-of-an-array
2383-add-two-integers
2481-strictly-palindromic-number
2491-smallest-even-multiple
2556-convert-the-temperature
2645-pass-the-pillow
2752-sum-multiples
3172-divisible-and-non-divisible-sums-difference
3476-find-minimum-operations-to-make-all-elements-divisible-by-three
3567-convert-date-to-binary
3581-the-two-sneaky-numbers-of-digitville

Trie

0014-longest-common-prefix

Two Pointers

0026-remove-duplicates-from-sorted-array
0027-remove-element
0042-trapping-rain-water
0125-valid-palindrome
0141-linked-list-cycle
0151-reverse-words-in-a-string
0167-two-sum-ii-input-array-is-sorted
0344-reverse-string
0349-intersection-of-two-arrays
0392-is-subsequence
0811-number-of-subarrays-with-bounded-maximum
0908-middle-of-the-linked-list
2481-strictly-palindromic-number
2917-count-pairs-whose-sum-is-less-than-target

Binary Search

0035-search-insert-position
0167-two-sum-ii-input-array-is-sorted
0209-minimum-size-subarray-sum
0349-intersection-of-two-arrays
2917-count-pairs-whose-sum-is-less-than-target

Sorting

0169-majority-element
0217-contains-duplicate
0242-valid-anagram
0349-intersection-of-two-arrays
0389-find-the-difference
0451-sort-characters-by-frequency
1137-height-checker
2331-intersection-of-multiple-arrays
2836-neither-minimum-nor-maximum
2917-count-pairs-whose-sum-is-less-than-target

Dynamic Programming

0042-trapping-rain-water
0070-climbing-stairs
0118-pascals-triangle
0338-counting-bits
0392-is-subsequence
1013-fibonacci-number

Stack

0020-valid-parentheses
0042-trapping-rain-water

Monotonic Stack

0042-trapping-rain-water

Bit Manipulation

0338-counting-bits
0389-find-the-difference
2308-divide-array-into-equal-pairs

Counting

0169-majority-element
0451-sort-characters-by-frequency
1341-split-a-string-in-balanced-strings
1635-number-of-good-pairs
2308-divide-array-into-equal-pairs
2331-intersection-of-multiple-arrays

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0643-maximum-average-subarray-i

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0724-find-pivot-index
2714-left-and-right-sum-differences

Heap (Priority Queue)

0451-sort-characters-by-frequency

Bucket Sort

0451-sort-characters-by-frequency

Divide and Conquer

0169-majority-element

Combinatorics

2324-find-triangular-sum-of-an-array

Greedy

1341-split-a-string-in-balanced-strings
2032-largest-odd-number-in-string

Counting Sort

1137-height-checker

Number Theory

2491-smallest-even-multiple

Recursion

1013-fibonacci-number

Memoization

0070-climbing-stairs
1013-fibonacci-number

Brainteaser

2481-strictly-palindromic-number

Linked List

0083-remove-duplicates-from-sorted-list
0141-linked-list-cycle
0908-middle-of-the-linked-list