Leetcode

Collection of LeetCode questions to ace the coding interview! - Created using LeetHub v3

LeetCode Topics

Stack

Problem Name	Difficulty
0020-valid-parentheses	Easy
0042-trapping-rain-water	Hard
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy
0150-evaluate-reverse-polish-notation	Medium
0155-min-stack	Medium
0739-daily-temperatures	Medium

Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy

Depth-First Search

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy

Binary Tree

Problem Name	Difficulty
0094-binary-tree-inorder-traversal	Easy
0144-binary-tree-preorder-traversal	Easy
0145-binary-tree-postorder-traversal	Easy

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0049-group-anagrams	Medium
0205-isomorphic-strings	Easy
0242-valid-anagram	Easy

String

Problem Name	Difficulty
0020-valid-parentheses	Easy
0049-group-anagrams	Medium
0125-valid-palindrome	Easy
0205-isomorphic-strings	Easy
0242-valid-anagram	Easy
2938-separate-black-and-white-balls	Medium
3517-smallest-palindromic-rearrangement-i	Medium

Two Pointers

Problem Name	Difficulty
0011-container-with-most-water	Medium
0015-3sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0042-trapping-rain-water	Hard
0125-valid-palindrome	Easy
0167-two-sum-ii-input-array-is-sorted	Medium
0977-squares-of-a-sorted-array	Easy
2938-separate-black-and-white-balls	Medium
3867-sum-of-gcd-of-formed-pairs	Medium

Greedy

Problem Name	Difficulty
0011-container-with-most-water	Medium
2938-separate-black-and-white-balls	Medium

Array

Problem Name	Difficulty
0001-two-sum	Easy
0011-container-with-most-water	Medium
0015-3sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0042-trapping-rain-water	Hard
0049-group-anagrams	Medium
0150-evaluate-reverse-polish-notation	Medium
0167-two-sum-ii-input-array-is-sorted	Medium
0238-product-of-array-except-self	Medium
0739-daily-temperatures	Medium
0977-squares-of-a-sorted-array	Easy
1260-shift-2d-grid	Easy
1464-maximum-product-of-two-elements-in-an-array	Easy
1979-find-greatest-common-divisor-of-array	Easy
3867-sum-of-gcd-of-formed-pairs	Medium

Binary Search

Problem Name	Difficulty
0167-two-sum-ii-input-array-is-sorted	Medium

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0049-group-anagrams	Medium
0242-valid-anagram	Easy
0977-squares-of-a-sorted-array	Easy
1464-maximum-product-of-two-elements-in-an-array	Easy
3517-smallest-palindromic-rearrangement-i	Medium
3867-sum-of-gcd-of-formed-pairs	Medium

Prefix Sum

Problem Name	Difficulty
0238-product-of-array-except-self	Medium

Dynamic Programming

Problem Name	Difficulty
0042-trapping-rain-water	Hard

Monotonic Stack

Problem Name	Difficulty
0042-trapping-rain-water	Hard
0739-daily-temperatures	Medium

Design

Problem Name	Difficulty
0155-min-stack	Medium

Math

Problem Name	Difficulty
0150-evaluate-reverse-polish-notation	Medium
1979-find-greatest-common-divisor-of-array	Easy
3658-gcd-of-odd-and-even-sums	Easy
3867-sum-of-gcd-of-formed-pairs	Medium

Number Theory

Problem Name	Difficulty
1979-find-greatest-common-divisor-of-array	Easy
3658-gcd-of-odd-and-even-sums	Easy
3867-sum-of-gcd-of-formed-pairs	Medium

Simulation

Problem Name	Difficulty
1260-shift-2d-grid	Easy
3867-sum-of-gcd-of-formed-pairs	Medium

Matrix

Problem Name	Difficulty
1260-shift-2d-grid	Easy

Heap (Priority Queue)

Problem Name	Difficulty
1464-maximum-product-of-two-elements-in-an-array	Easy

Counting Sort

Problem Name	Difficulty
3517-smallest-palindromic-rearrangement-i	Medium