# Status Problem video Level Completes Likes
337

Find first two largest elements in a given array

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336

Calculate Logn base r – Java Implementation

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334

Dijkstra Algorithm Implementation – TreeSet

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330

Check if Given Number is power of 2

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329

Rotate the given array in cycles

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328

Heap Sort

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325

Find no of reverse pairs in an array which is sorted in two parts in O(N)

Medium % 1
319

Get the Sum of Digits in a number till it become a single digit

Medium % 0
317

Check if given number is Prime - O(√N) Solution

Medium % 0
302

Fizz Buzz Challenge

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274

Graph – Detect Cycle in an Undirected Graph using DFS

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273

Graph – Detect Cycle in a Directed Graph

Medium % 1
272

Graph – Software Installation Problem

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268

Topological Sort

Medium % 1
261

Sliding Window Algorithm (Track the maximum of each subarray of size k)

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248

Remove Duplicates from a string | 4 Approaches

Medium % 0
246

Dynamic programming – Minimum Jumps to reach to end

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236

Find three elements in an array that sum to a given value

Beginner % 1
235

Majority Element- Boyer–Moore majority vote algorithm

Medium % 0
232

Check whether the given number is a perfect square

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230

Find the Index from which 0 starts

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228

Find the only element in array which appears only once

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227

Algorithm to calculate power(k,n).

Beginner % 1
219

Find the two repeating elements in a given array | 6 Approaches

Medium % 1
217

Find two elements whose sum is closest to zero

Medium % 1
215

Find duplicates in an given array in O(n) time and O(1) space

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214

Find the last non repeating character in a given string.

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213

Find the last repeating character in a given string

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212

Find the first non repeating character in a given string

Beginner % 0
211

Find the first repeating character in a given string

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198

Kadane's Algorithm - Maximum Subarray Problem

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193

Implement Stack Using Linked List

Beginner % 0
186

Reverse a Linked List in groups of given size 'K'

Medium % 0

Find first two largest elements in a given array

Calculate Logn base r – Java Implementation

Dijkstra Algorithm Implementation – TreeSet

Check if Given Number is power of 2

Rotate the given array in cycles

Heap Sort

Find no of reverse pairs in an array which is sorted in two parts in O(N)

Get the Sum of Digits in a number till it become a single digit

Check if given number is Prime - O(√N) Solution

Fizz Buzz Challenge

Graph – Detect Cycle in an Undirected Graph using DFS

Graph – Detect Cycle in a Directed Graph

Graph – Software Installation Problem

Topological Sort

Sliding Window Algorithm (Track the maximum of each subarray of size k)

Remove Duplicates from a string | 4 Approaches

Dynamic programming – Minimum Jumps to reach to end

Find three elements in an array that sum to a given value

Majority Element- Boyer–Moore majority vote algorithm

Check whether the given number is a perfect square

Find the Index from which 0 starts

Find the only element in array which appears only once

Algorithm to calculate power(k,n).

Find the two repeating elements in a given array | 6 Approaches

Find two elements whose sum is closest to zero

Find duplicates in an given array in O(n) time and O(1) space

Find the last non repeating character in a given string.

Find the last repeating character in a given string

Find the first non repeating character in a given string

Find the first repeating character in a given string

Kadane's Algorithm - Maximum Subarray Problem

Implement Stack Using Linked List

Reverse a Linked List in groups of given size 'K'