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248 problems total

Array (1905)Sorting (440)Depth First Search (316)Database (301)Breadth First Search (241)Tree (240)Stack (172)Graph Theory (169)Linked List (81)Monotonic Stack (67)Queue (50)Recursion (48)Shortest Path (33)

All Topics(4301)Database(305)Networking(0)Object Oriented Design(31)Programming Languages(5)System Design(0)Algorithms(3944)

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Title	Difficulty	Videos	Companies
Calculate the number of valid stack permutations	medium	-
Check if number sequence can be generated using stack push and pop operations	medium	-
Convert an infix expression to postfix	medium	-
Count Non-Decreasing Subarrays After K Operations	hard	-
Double Stacks	easy	-
Find Mirror Score of a String	medium	-
Implement 3 stacks in 1 array	medium	-
Implement insertion sort on stack	medium	-
Implement queue using deque	easy	-
Implement queue using linked list	easy	-
Implement selection sort on stack	medium	-
Implement stack using an array	easy	-
Implement stack using deque	easy	-
Implement stack using linked list	easy	-
Implement stack using priority queue	easy	-	adobe microsoft amazon
Implement stack using resizing of array	easy	-
Interleave the first half of the stack with second half using one queue	medium	-
Valid Parentheses	easy		adobe airbnb akuna-capital
Make Array Non-decreasing	medium	-
Maximum and Minimum Sums of at Most Size K Subarrays	hard	-
Maximum Number of Matching Indices After Right Shifts	easy	-
Min Queue	easy	-
Minimum Cost Tree From Leaf Values	medium	-
Minimum Operations to Convert All Elements to Zero	medium	-
Redundant Braces	easy	-	amazon
Reverse a stack in place using recursion	medium	-
Reverse the given Array without using built in function	easy	-
Reverse words in a string keep delimiters in order	hard	-
Sorting a Stack using push,pop,isEmpty and peek	medium	-
Stack of plates	medium	-	microsoft amazon
Longest Valid Parentheses	hard	-	adobe amazon apple
Trapping Rain Water	hard	-	adobe affirm airbnb
Tower of Hanoi	medium
Simplify Path	medium	-	adobe amazon bloomberg
Largest Rectangle in Histogram	hard	-	adobe amazon bloomberg
Maximal Rectangle	hard	-	adobe amazon bloomberg
Binary Tree Inorder Traversal	easy	-	alibaba amazon apple
Flatten binary tree to linked list in order of preorder traversal	medium	-	adobe amazon apple
Reorder List such that i-th element points to n-i-th element	medium		adobe amazon apple
Binary Tree Preorder Traversal	easy	-	amazon bloomberg cisco
Binary Tree Postorder Traversal	easy	-	adobe amazon facebook
Evaluate Reverse Polish Notation	medium	-	amazon atlassian facebook
Min Stack	medium	-	adobe amazon apple
Binary Search Tree BST Inorder Iterator	medium	-	alibaba amazon apple
Basic Calculator 1	hard	-	adobe amazon bloomberg
Implement stack using queues	easy	-	amazon bloomberg citadel
Basic Calculator 2 Problem	medium	-	airbnb amazon apple
Implement Queue using Stacks	easy	-	amazon apple bloomberg
Palindrome Linked List	easy	-	adobe amazon apple
Verify Preorder Sequence in Binary Search Tree	medium	-	mathworks uber zenefits

Showing 1 to 50 of 248 results