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Top 25 Frequently Asked Interview Questions in Technical Rounds

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Here is the collection of the TOP 25 frequently asked questions based on the experience of interviews in multiple companies. 

1Lowest common Ancestor
2An unsorted array of integers is given; you must find the max product formed by multiplying three numbers. (You cannot sort the array, watch out when there are negative numbers)
3Left View of a tree
4Reversing of Arrays
5Cache Line, Cache internal concept, RR scheduling
6Print the middle of a given linked list
7Pair-wise swap of elements in a linked list
8HashMap internals
9Double checking Singleton
10Factory Pattern
11Print a given matrix in spiral form
12DFS on Graph and its representation
13
Object-Oriented concept
14Print nth last node in the linked list
15Delete a given node in Linked List under the given constraints
16Implement Stack using Queues
17Find if two rectangles overlap
18Multithreading concepts
19Given an array of integers, update the index with the multiplication of previous and next integers.
20Difference between creating threads in Java using Thread and Runnable
21How HashSet is implemented in Java internally.
22DeadLock example code (Producer & Consumer Problem)
23Find the number which is not repeated in an Array of integers, others are present two times. (Non-Repeating Element)
24Serialization and related concepts.
25Comparators in TreeSet

Last Updated : 12 May, 2023
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