My Leetcode & Geeksforgeeks Solutions

ℹ️ All solutions are in C++ & are organized topic-wise.

Leetcode Questions

Arrays 🔝

SNo	Name	Difficulty	Question	Solution
1	Two Sum	Easy	view	view
2	Pascal's Triangle	Easy	view	view
3	Pascal's Triangle II	Easy	view	view
4	Best Time to Buy and Sell Stock	Easy	view	view
5	Best Time to Buy and Sell Stock II	Medium	view	view
6	Longest Consecutive Sequence	Medium	view	view
7	Majority Element	Easy	view	view
8	Majority Element II	Medium	view	view
9	Remove Element	Easy	view	view
10	4Sum	Medium	view	view
11	Maximum Ascending Subarray Sum	Medium	view	view
12	Find the Duplicate Number	Medium	view	view
13	Next Permutation	Medium	view	view
14	Search in Rotated Sorted Array	Medium	view	view
15	Combination Sum	Medium	view	view
16	Combination Sum II	Medium	view	view
17	Permutations II	Medium	view	view
18	Rotate Image	Medium	view	view
19	Pow(x, n)	Medium	view	view
20	Maximum Subarray	Medium	view	view
21	Merge Intervals	Medium	view	view
22	Set Mismatch	Easy	view	view
23	Set Matrix Zeroes	Medium	view	view
24	Palindrome Number	Easy	view	view
25	Ugly Number	Easy	view	view
26	Ugly Number II	Medium	view	view
27	Maximum Length of Pair Chain	Medium	view	view
28	Happy Number	Easy	view	view

Strings 🔝

SNo	Name	Difficulty	Question	Solution
1	Integer to Roman	Medium	view	view
2	Roman to Integer	Easy	view	view
3	Longest Common Subsequence	Medium	view	view
4	Longest Palindromic Subsequence	Medium	view	view
5	Minimum Insertion Steps to Make a String Palindrome	Hard	view	view
6	Shortest Common Supersequence	Hard	view	view
7	Delete Operation for Two Strings	Medium	view	view
8	Edit Distance	Hard	view	view
9	Wildcard Matching	Hard	view	view
23	Distinct Subsequences	Hard	view	view

Graph 🔝

SNo	Name	Difficulty	Question	Solution
1	Number of Enclaves	Medium	view	view
2	Critical Connections in a Network	Hard	view	view
3	Word Ladder	Hard	view	view
4	Surrounded Regions DFS	Medium	view	view
5	Number of Ways to Arrive at Destination	Medium	view	view
6	Number of Islands BFS	Medium	view	view
7	Number of Islands DFS	Medium	view	view
8	Course Schedule	Medium	view	view
9	Course Schedule II	Medium	view	view
10	Island Perimeter	Easy	view	view
11	01 Matrix	Medium	view	view
12	Flood Fill	Easy	view	view
13	Is Graph Bipartite BFS	Medium	view	view
14	Is Graph Bipartite DFS	Medium	view	view
15	Rotting Oranges	Medium	view	view
16	Cheapest Flights Within K Stops	Medium	view	view
17	Network Delay Time using Bellman Ford	Medium	view	view
18	Network Delay Time using Dijkstra	Medium	view	view
19	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	view	view
20	Most Stones Removed with Same Row or Column	Medium	view	view
21	Path With Minimum Effort	Medium	view	view
22	Shortest Path in Binary Matrix	Medium	view	view
23	Max Area of Island	Medium	view	view

Dynamic Programming 🔝

SNo	Name	Difficulty	Question	Solution
1	Fibonacci Number	Easy	view	view
2	N-th Tribonacci Number	Easy	view	view
3	Climbing Stairs	Easy	view	view
4	House Robber	Medium	view	view
5	House Robber II	Medium	view	view
6	Unique Paths	Medium	view	view
7	Unique Paths II	Medium	view	view
8	Minimum Path Sum	Medium	view	view
9	Minimum Falling Path Sum	Medium	view	view
10	Triangle	Medium	view	view
11	Cherry Pickup II	Hard	view	view
12	Target Sum	Medium	view	view
13	Partition Equal Subset Sum	Medium	view	view
14	Coin Change	Medium	view	view
15	Coin Change II	Medium	view	view
16	Longest Common Subsequence	Medium	view	view
17	Longest Palindromic Subsequence	Medium	view	view
18	Minimum Insertion Steps to Make a String Palindrome	Hard	view	view
19	Shortest Common Supersequence	Hard	view	view
20	Delete Operation for Two Strings	Medium	view	view
21	Edit Distance	Hard	view	view
22	Wildcard Matching	Hard	view	view
23	Distinct Subsequences	Hard	view	view
24	Best Time to Buy and Sell Stock II	Medium	view	view
25	Best Time to Buy and Sell Stock III	Hard	view	view
26	Best Time to Buy and Sell Stock IV	Hard	view	view
27	Best Time to Buy and Sell Stock with Cooldown	Medium	view	view
28	Best Time to Buy and Sell Stock with Transaction Fee	Medium	view	view
29	Longest Increasing Subsequence	Medium	view	view
30	Longest String Chain	Medium	view	view
31	Burst Balloons	Hard	view	view
31	Min Cost Climbing Stairs	Easy	view	view
32	Number of Longest Increasing Subsequence	Medium	view	view
33	Minimum Cost to Cut a Stick	Hard	view	view
34	Partition Array for Maximum Sum	Medium	view	view
35	Largest Divisible Subset	Medium	view	view
36	Palindrome Partitioning II	Hard	view	view
37	Count Square Submatrices with All Ones	Medium	view	view

Geeksforgeeks Questions

Graph 🔝

SNo	Name	Difficulty	Question	Solution
1	BFS of Graph	Easy	view	view
2	DFS of Graph	Easy	view	view
3	Print adjacency list	Easy	view	view
4	Flood fill Algorithm	Medium	view	view
5	Rotten Oranges	Medium	view	view
6	Number of Distinct Islands	Medium	view	view
7	Bipartite Graph	Medium	view	view
8	Detect cycle in a directed graph	Medium	view	view
9	Detect cycle in an undirected graph BFS	Medium	view	view
10	Detect cycle in an undirected graph DFS	Medium	view	view
11	Distance of nearest cell having 1	Medium	view	view
12	Number of Enclaves	Medium	view	view
13	Number of Provinces	Medium	view	view
14	Replace O's with X's	Medium	view	view
15	Word Ladder I	Hard	view	view
16	Word Ladder II	Hard	view	view
17	Topological sort	Medium	view	view
18	Eventual Safe States	Medium	view	view
19	Course Schedule	Medium	view	view
20	Alien Dictionary	Hard	view	view
21	Shortest Distance in a Binary Maze	Medium	view	view
22	Path With Minimum Effort	Medium	view	view
23	Number of Ways to Arrive at Destination	Medium	view	view
24	Minimum Multiplications to reach End	Medium	view	view
25	Implementing Dijkstra Algorithm using set	Medium	view	view
26	Implementing Dijkstra Algorithm using priority queue	Medium	view	view
27	Cheapest Flights Within K Stops	Medium	view	view
28	Floyd Warshall	Medium	view	view
29	Minimum Spanning Tree using Prims Algorithm	Medium	view	view
30	Distance from the Source (Bellman-Ford Algorithm)	Medium	view	view
31	Find the number of islands using DFS	Medium	view	view
32	Alex Travelling using Bellman Ford	Medium	view	view
33	Alex Travelling using Dijkstra	Medium	view	view
34	Disjoint set (Union-Find)	Easy	view	view
35	Strongly Connected Components (Kosaraju's Algo)	Medium	view	view
36	Connecting the graph	Medium	view	view
37	Number of Provinces using Disjoint Set	Medium	view	view
38	Minimum Spanning Tree using Kruskal Algorithm	Medium	view	view
39	City With the Smallest Number of Neighbors at a Threshold Distance	Medium	view	view

Dynamic Programming 🔝

SNo	Name	Difficulty	Question	Solution
1	Subset Sum Problem	Medium	view	view
2	Perfect Sum Problem	Medium	view	view
3	0 - 1 Knapsack Problem	Medium	view	view
4	Knapsack with Duplicate Items	Easy	view	view
5	Rod Cutting	Medium	view	view
6	Longest Common Subsequence	Medium	view	view
7	Longest Common Substring	Medium	view	view
8	Longest Palindromic Subsequence	Medium	view	view
9	Shortest Common Supersequence	Medium	view	view
10	Form a palindrome	Medium	view	view
11	Minimum number of deletions and insertions	Easy	view	view
12	Edit Distance	Medium	view	view
13	Wildcard Pattern Matching	Medium	view	view
14	Longest Bitonic subsequence	Medium	view	view
15	Burst Balloons	Hard	view	view
16	Matrix Chain Multiplication	Hard	view	view
17	Boolean Parenthesization	Hard	view	view
18	Palindromic Partitioning	Hard	view	view
19	Partition Array for Maximum Sum	Medium	view	view

Strings 🔝

SNo	Name	Difficulty	Question	Solution
1	Longest Common Subsequence	Medium	view	view
2	Longest Common Substring	Medium	view	view
3	Longest Palindromic Subsequence	Medium	view	view
4	Shortest Common Supersequence	Medium	view	view
5	Form a palindrome	Medium	view	view
6	Minimum number of deletions and insertions	Easy	view	view
7	Edit Distance	Medium	view	view
8	Wildcard Pattern Matching	Medium	view	view

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