PrepFlow
  • PrepFlow
  • Jobs
  • ATS Checker
  • Companies
  • DSA Sheets
  • Compiler
Sign in

PrepFlow

Streamline your DSA prep with structured sheets and company-wise problems.

Quick Links

  • Jobs
  • ATS Checker
  • Companies
  • DSA Sheets
  • Compiler

Developed and Maintained By

Rayudu Bharani

Cygnuxxs

© 2026 PrepFlow. All rights reserved.

Privacy Policy | Terms of Service

Login Required!
You need to log in to access your saved progress.
  1. DSA Sheets
  3. DSA Sheet by Love Babbar
  5. Stacks and Queues

Stacks And Queues

Overall Progress0/29(0%)
Easy
0/9
Medium
0/17
Hard
0/1
Stack using two queues
Easy
Queue using two Stacks
Easy
Reverse First K elements of Queue
Easy
Evaluation of Postfix Expression
Easy
Queue Reversal
Easy
Parenthesis Checker
Easy
Reverse Using Stack
Easy
Special Stack
Easy
Insert an Element at the Bottom of a Stack
Easy
Valid Substring
Medium
Distance of nearest cell having 1
Medium
Reverse a Stack
Medium
Interleave the First Half of the Queue with Second Half
Medium
Next Greater Element
Medium
The Celebrity Problem
Medium
First non-repeating in a stream
Medium
Circular tour
Medium
First negative in every window of size k
Medium
Two Stacks in an Array
Medium
Rotten Oranges
Medium
Sort a stack
Medium
Stack Permutations
Medium
Check if all levels of two trees are anagrams or not
Medium
LeetCode icon
LRU Cache
Medium
Game with String
Medium
Expression contains redundant bracket or not
Medium
Histogram Max Rectangular Area
Hard
Queue Using Array
Unknown
Implement stack using array
Unknown
Visitors2
Compiler Status