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Top 20 Problems on Dynamic programming

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Top 25 Problems on Trees

Top 10 Problems on Bits Manipulation

Top 15 Problems in LinkedList

All Problems

# Status Problem video Level Completes Likes
373

Longest substring with at most two unique characters

Medium % 0
372

Monotone Increasing Digits

Medium % 1
371

Convert Infix to Prefix Expression

Medium % 0
370

Find third largest element in a given array

Beginner % 0
369

Find duplicates Characters in the given String

Beginner % 0
368

Max Flow Problem - Ford-Fulkerson Algorithm

Hard % 0
367

Sum of all Unique elements in a given array

Beginner % 0
366

Java program to find the largest element in array

Beginner % 0
365

Convert Infix to Postfix Expression

Medium % 0
364

Find three smallest elements in a given array

Beginner % 0
363

Evaluation of Infix expressions

Medium % 0
362

Stack Java Class - Explained

Beginner % 0
361

Convert Prefix to Infix Expression

Medium % 0
360

Least Recently Used (LRU) Cache – Using LinkedHashSet and Deque | Set 2

Hard % 0
359

Merge K sorted Linked List - Using Priority Queue

Hard % 0
358

Infix, Postfix and Prefix Notations/Expressions

Beginner % 0
357

Count Set bits in a given Number

Beginner % 1
356

Check if array contains all unique or distinct numbers

Beginner % 0
355

Product of all Unique elements in a given array

Beginner % 0
354

Valid Multiple Parentheses

Medium % 1
353

Reverse a given number

Beginner % 1
352

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

Beginner % 0
351

Least Recently Used (LRU) Cache – Using HashMap and Doubly Linked List | Set 1

Hard % 1
350

Find first three largest elements in a given array

Beginner % 0
349

Selection Sort

Beginner % 0
347

Find the nearest building which has bike | Find nearest specific vertex from source in a graph.

Hard % 0
346

Valid Brackets – Part 2 | Stack Method

Beginner % 0
345

Find the roots of Quadratic Equation – Java Program

Beginner % 0
344

Given two strings validate the output string

Beginner % 0
343

Generate all the strings of length n from 0 to k-1

Medium % 0
342

Find two smallest elements in a given array

Beginner % 0
341

Front and Back Search in an Array

Beginner % 0
339

Multiply with power of 2 without using pow() or * operator

Beginner % 1

Longest substring with at most two unique characters

Monotone Increasing Digits

Convert Infix to Prefix Expression

Find third largest element in a given array

Find duplicates Characters in the given String

Max Flow Problem - Ford-Fulkerson Algorithm

Sum of all Unique elements in a given array

Java program to find the largest element in array

Convert Infix to Postfix Expression

Find three smallest elements in a given array

Evaluation of Infix expressions

Stack Java Class - Explained

Convert Prefix to Infix Expression

Least Recently Used (LRU) Cache – Using LinkedHashSet and Deque | Set 2

Merge K sorted Linked List - Using Priority Queue

Infix, Postfix and Prefix Notations/Expressions

Count Set bits in a given Number

Check if array contains all unique or distinct numbers

Product of all Unique elements in a given array

Valid Multiple Parentheses

Reverse a given number

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

Least Recently Used (LRU) Cache – Using HashMap and Doubly Linked List | Set 1

Find first three largest elements in a given array

Selection Sort

Find the nearest building which has bike | Find nearest specific vertex from source in a graph.

Valid Brackets – Part 2 | Stack Method

Find the roots of Quadratic Equation – Java Program

Given two strings validate the output string

Generate all the strings of length n from 0 to k-1

Find two smallest elements in a given array

Front and Back Search in an Array

Multiply with power of 2 without using pow() or * operator