Data-Structures-and-Algorithms-LeetCode-

Collection of my solutions to LeetCode questions in C#, Python and Javascript - Created using LeetHub

LeetCode Topics

Array

Problem Name	Difficulty
0001-two-sum	Easy
0011-container-with-most-water	Medium
0053-maximum-subarray	Medium
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium
0167-two-sum-ii-input-array-is-sorted	Medium
0200-number-of-islands	Medium
0238-product-of-array-except-self	Medium
0283-move-zeroes	Easy
0322-coin-change	Medium
0347-top-k-frequent-elements	Medium
0350-intersection-of-two-arrays-ii	Easy
0377-combination-sum-iv	Medium
0746-min-cost-climbing-stairs	Easy
0845-longest-mountain-in-array	Medium
1109-corporate-flight-bookings	Medium
1877-minimize-maximum-pair-sum-in-array	Medium
1886-determine-whether-matrix-can-be-obtained-by-rotation	Easy
3718-smallest-missing-multiple-of-k	Easy
3731-find-missing-elements	Easy

Two Pointers

Problem Name	Difficulty
0011-container-with-most-water	Medium
0167-two-sum-ii-input-array-is-sorted	Medium
0283-move-zeroes	Easy
0350-intersection-of-two-arrays-ii	Easy
0844-backspace-string-compare	Easy
0845-longest-mountain-in-array	Medium
1877-minimize-maximum-pair-sum-in-array	Medium

Greedy

Problem Name	Difficulty
0011-container-with-most-water	Medium
0122-best-time-to-buy-and-sell-stock-ii	Medium
1877-minimize-maximum-pair-sum-in-array	Medium

Sorting

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium
0350-intersection-of-two-arrays-ii	Easy
1877-minimize-maximum-pair-sum-in-array	Medium
3731-find-missing-elements	Easy

Matrix

Problem Name	Difficulty
0200-number-of-islands	Medium
1886-determine-whether-matrix-can-be-obtained-by-rotation	Easy

Dynamic Programming

Problem Name	Difficulty
0053-maximum-subarray	Medium
0121-best-time-to-buy-and-sell-stock	Easy
0122-best-time-to-buy-and-sell-stock-ii	Medium
0322-coin-change	Medium
0377-combination-sum-iv	Medium
0746-min-cost-climbing-stairs	Easy
0845-longest-mountain-in-array	Medium

Breadth-First Search

Problem Name	Difficulty
0200-number-of-islands	Medium
0322-coin-change	Medium

Divide and Conquer

Problem Name	Difficulty
0053-maximum-subarray	Medium
0347-top-k-frequent-elements	Medium

Tree

Problem Name	Difficulty
0110-balanced-binary-tree	Easy

Depth-First Search

Problem Name	Difficulty
0110-balanced-binary-tree	Easy
0200-number-of-islands	Medium

Binary Tree

Problem Name	Difficulty
0110-balanced-binary-tree	Easy

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0003-longest-substring-without-repeating-characters	Medium
0347-top-k-frequent-elements	Medium
0350-intersection-of-two-arrays-ii	Easy
3718-smallest-missing-multiple-of-k	Easy
3731-find-missing-elements	Easy

Binary Search

Problem Name	Difficulty
0167-two-sum-ii-input-array-is-sorted	Medium
0350-intersection-of-two-arrays-ii	Easy

Math

Problem Name	Difficulty
0836-rectangle-overlap	Easy
3345-smallest-divisible-digit-product-i	Easy

Enumeration

Problem Name	Difficulty
0845-longest-mountain-in-array	Medium
3345-smallest-divisible-digit-product-i	Easy

Prefix Sum

Problem Name	Difficulty
0238-product-of-array-except-self	Medium
1109-corporate-flight-bookings	Medium

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0844-backspace-string-compare	Easy

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium

Stack

Problem Name	Difficulty
0844-backspace-string-compare	Easy

Simulation

Problem Name	Difficulty
0844-backspace-string-compare	Easy

Union-Find

Problem Name	Difficulty
0200-number-of-islands	Medium

Geometry

Problem Name	Difficulty
0836-rectangle-overlap	Easy

Heap (Priority Queue)

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Bucket Sort

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Counting

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium

Quickselect

Problem Name	Difficulty
0347-top-k-frequent-elements	Medium