leetcode

Daily leetcode problem solutions collection. Created using LeetHub v3

LeetCode Topics

Array

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0033-search-in-rotated-sorted-array	Medium
0035-search-insert-position	Easy
0036-valid-sudoku	Medium
0042-trapping-rain-water	Hard
0049-group-anagrams	Medium
0074-search-a-2d-matrix	Medium
0078-subsets	Medium
0088-merge-sorted-array	Easy
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium
0128-longest-consecutive-sequence	Medium
0153-find-minimum-in-rotated-sorted-array	Medium
0167-two-sum-ii-input-array-is-sorted	Medium
0209-minimum-size-subarray-sum	Medium
0219-contains-duplicate-ii	Easy
0229-majority-element-ii	Medium
0525-contiguous-array	Medium
0682-baseball-game	Easy
0704-binary-search	Easy
0875-koko-eating-bananas	Medium
1475-final-prices-with-a-special-discount-in-a-shop	Easy
1848-minimum-distance-to-the-target-element	Easy
2078-two-furthest-houses-with-different-colors	Easy
2133-check-if-every-row-and-column-contains-all-numbers	Easy
2515-shortest-distance-to-target-string-in-a-circular-array	Easy
2529-maximum-count-of-positive-integer-and-negative-integer	Easy

Stack

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0225-implement-stack-using-queues	Easy
0682-baseball-game	Easy
0901-online-stock-span	Medium
1475-final-prices-with-a-special-discount-in-a-shop	Easy

Monotonic Stack

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0901-online-stock-span	Medium
1475-final-prices-with-a-special-discount-in-a-shop	Easy

Design

Problem Name	Difficulty
0225-implement-stack-using-queues	Easy
0901-online-stock-span	Medium

Data Stream

Problem Name	Difficulty
0901-online-stock-span	Medium

Hash Table

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0036-valid-sudoku	Medium
0049-group-anagrams	Medium
0128-longest-consecutive-sequence	Medium
0141-linked-list-cycle	Easy
0219-contains-duplicate-ii	Easy
0229-majority-element-ii	Medium
0424-longest-repeating-character-replacement	Medium
0525-contiguous-array	Medium
0567-permutation-in-string	Medium
2133-check-if-every-row-and-column-contains-all-numbers	Easy

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0049-group-anagrams	Medium
0125-valid-palindrome	Easy
0424-longest-repeating-character-replacement	Medium
0567-permutation-in-string	Medium
0657-robot-return-to-origin	Easy
2515-shortest-distance-to-target-string-in-a-circular-array	Easy
2839-check-if-strings-can-be-made-equal-with-operations-i	Easy

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0049-group-anagrams	Medium
0088-merge-sorted-array	Easy
0229-majority-element-ii	Medium

Dynamic Programming

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium

Matrix

Problem Name	Difficulty
0036-valid-sudoku	Medium
0074-search-a-2d-matrix	Medium
2133-check-if-every-row-and-column-contains-all-numbers	Easy

Union-Find

Problem Name	Difficulty
0128-longest-consecutive-sequence	Medium

Two Pointers

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0042-trapping-rain-water	Hard
0088-merge-sorted-array	Easy
0125-valid-palindrome	Easy
0141-linked-list-cycle	Easy
0167-two-sum-ii-input-array-is-sorted	Medium
0567-permutation-in-string	Medium

Binary Search

Problem Name	Difficulty
0033-search-in-rotated-sorted-array	Medium
0035-search-insert-position	Easy
0069-sqrtx	Easy
0074-search-a-2d-matrix	Medium
0153-find-minimum-in-rotated-sorted-array	Medium
0167-two-sum-ii-input-array-is-sorted	Medium
0209-minimum-size-subarray-sum	Medium
0367-valid-perfect-square	Easy
0374-guess-number-higher-or-lower	Easy
0704-binary-search	Easy
0875-koko-eating-bananas	Medium
2529-maximum-count-of-positive-integer-and-negative-integer	Easy

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0209-minimum-size-subarray-sum	Medium
0219-contains-duplicate-ii	Easy
0424-longest-repeating-character-replacement	Medium
0567-permutation-in-string	Medium

Greedy

Problem Name	Difficulty
0122-best-time-to-buy-and-sell-stock-ii	Medium
2078-two-furthest-houses-with-different-colors	Easy

Math

Problem Name	Difficulty
0069-sqrtx	Easy
0367-valid-perfect-square	Easy
3783-mirror-distance-of-an-integer	Easy
3870-count-commas-in-range	Easy
3871-count-commas-in-range-ii	Medium

Prefix Sum

Problem Name	Difficulty
0209-minimum-size-subarray-sum	Medium
0525-contiguous-array	Medium

Counting

Problem Name	Difficulty
0229-majority-element-ii	Medium
2529-maximum-count-of-positive-integer-and-negative-integer	Easy

Interactive

Problem Name	Difficulty
0374-guess-number-higher-or-lower	Easy

Simulation

Problem Name	Difficulty
0657-robot-return-to-origin	Easy
0682-baseball-game	Easy

Queue

Problem Name	Difficulty
0225-implement-stack-using-queues	Easy

Backtracking

Problem Name	Difficulty
0078-subsets	Medium

Bit Manipulation

Problem Name	Difficulty
0078-subsets	Medium

Linked List

Problem Name	Difficulty
0021-merge-two-sorted-lists	Easy
0083-remove-duplicates-from-sorted-list	Easy
0141-linked-list-cycle	Easy
0206-reverse-linked-list	Easy

Recursion

Problem Name	Difficulty
0021-merge-two-sorted-lists	Easy
0206-reverse-linked-list	Easy