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Ola Interview Questions (24)

Practice real interview problems from Ola

All24 Easy5 Medium14 Hard5

Status	Title	Solution	Practice	Difficulty	Companies	Topics
	1. Two Sum	Solution	Solve	Easy	Accenture+126	Array Hash Table
	2. Add Two Numbers	Solution	Solve	Medium	Accenture+36	Linked List Math+1
	3. Longest Substring Without Repeating Characters	Solution	Solve	Medium	Accenture+104	Hash Table Sliding Window+1
	5. Longest Palindromic Substring	Solution	Solve	Medium	Accenture+81	Dynamic Programming String+1
	11. Container With Most Water	Solution	Solve	Medium	Accenture+57	Array Greedy+1
	15. 3Sum	Solution	Solve	Medium	Accenture+56	Array Sorting+1
	41. First Missing Positive	Solution	Solve	Hard	Amazon+32	Array Hash Table
	42. Trapping Rain Water	Solution	Solve	Hard	Accenture+72	Array Dynamic Programming+3
	49. Group Anagrams	Solution	Solve	Medium	Accolite+86	Array Hash Table+2
	62. Unique Paths	Solution	Solve	Medium	Accenture+20	Combinatorics Dynamic Programming+1
	70. Climbing Stairs	Solution	Solve	Easy	Accenture+36	Dynamic Programming Math+1
	98. Validate Binary Search Tree	Solution	Solve	Medium	Amazon+17	Binary Search Tree Binary Tree+2
	121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	Accenture+91	Array Dynamic Programming
	124. Binary Tree Maximum Path Sum	Solution	Solve	Hard	Adobe+24	Binary Tree Depth-First Search+2
	127. Word Ladder	Solution	Solve	Hard	Adobe+40	Breadth-First Search Hash Table+1
	153. Find Minimum in Rotated Sorted Array	Solution	Solve	Medium	Amazon+17	Array Binary Search
	168. Excel Sheet Column Title	Solution	Solve	Easy	Accenture+9	Math String
	198. House Robber	Solution	Solve	Medium	Accenture+39	Array Dynamic Programming
	200. Number of Islands	Solution	Solve	Medium	Accenture+85	Array Breadth-First Search+3
	237. Delete Node in a Linked List	Solution	Solve	Medium	Adobe+9	Linked List
	269. Alien Dictionary	Solution	Solve	Hard	Airbnb+17	Array Breadth-First Search+4
	394. Decode String	Solution	Solve	Medium	Activision+39	Recursion Stack+1
	724. Find Pivot Index	Solution	Solve	Easy	Accenture+17	Array Prefix Sum
	863. All Nodes Distance K in Binary Tree	Solution	Solve	Medium	Amazon+15	Binary Tree Breadth-First Search+3

Two Sum

Easy✓ Solution📹 Video

Accenture+126

Array Hash Table

Add Two Numbers

Medium✓ Solution📹 Video

Accenture+36

Linked List Math Recursion

Longest Substring Without Repeating Characters

Medium✓ Solution📹 Video

Accenture+104

Hash Table Sliding Window String

Longest Palindromic Substring

Medium✓ Solution📹 Video

Accenture+81

Dynamic Programming String Two Pointers

Container With Most Water

Medium✓ Solution📹 Video

Accenture+57

Array Greedy Two Pointers

3Sum

Medium✓ Solution📹 Video

Accenture+56

Array Sorting Two Pointers

First Missing Positive

Hard✓ Solution📹 Video

Amazon+32

Array Hash Table

Trapping Rain Water

Hard✓ Solution

Accenture+72

Array Dynamic Programming Monotonic Stack+2

Group Anagrams

Medium✓ Solution📹 Video

Accolite+86

Array Hash Table Sorting+1

Unique Paths

Medium✓ Solution

Accenture+20

Combinatorics Dynamic Programming Math

Climbing Stairs

Easy✓ Solution📹 Video

Accenture+36

Dynamic Programming Math Memoization

Validate Binary Search Tree

Medium✓ Solution📹 Video

Amazon+17

Binary Search Tree Binary Tree Depth-First Search+1

Best Time to Buy and Sell Stock

Easy✓ Solution📹 Video

Accenture+91

Array Dynamic Programming

Binary Tree Maximum Path Sum

Hard✓ Solution

Adobe+24

Binary Tree Depth-First Search Dynamic Programming+1

Word Ladder

Hard✓ Solution📹 Video

Adobe+40

Breadth-First Search Hash Table String

Find Minimum in Rotated Sorted Array

Medium✓ Solution

Amazon+17

Array Binary Search

Excel Sheet Column Title

Easy✓ Solution

Accenture+9

House Robber

Medium✓ Solution

Accenture+39

Array Dynamic Programming

Number of Islands

Medium✓ Solution📹 Video

Accenture+85

Array Breadth-First Search Depth-First Search+2

Delete Node in a Linked List

Medium✓ Solution

Adobe+9

Alien Dictionary

Hard✓ Solution📹 Video

Airbnb+17

Array Breadth-First Search Depth-First Search+3

Decode String

Medium✓ Solution

Activision+39

Recursion Stack String

Find Pivot Index

Easy✓ Solution

Accenture+17

Array Prefix Sum

All Nodes Distance K in Binary Tree

Medium✓ Solution

Amazon+15

Binary Tree Breadth-First Search Depth-First Search+2