Amazon Interview | Set 70 (On-Campus For Internship)
Online Round Coding Question:
- Given a float number 7.64, convert it into the string WITHOUT using any inbuilt function/library.
float no.: 7.64
- Given the inorder and preorder traversals of a Binary Tree, output the postorder traversal of it.
Inorder: 7, 8, 4, 1, 6, 2, 5
Preorder: 1, 4, 7, 8, 2, 6, 4
Postorder: 8, 7, 4, 6, 5, 2, 1
Round 1 written:
- Given a string find the length of longest substring which has none of its character repeated?
length of longest substring with no repeating charcters: 3 (abc)
- Given a link list with right pointers and each element of the list has a down link contains another link list with down pointers as:
5 -> 7 -> 9 -> 18
| | | |
10 6 14 20
| | | |
11 8 19 22
| | |
12 13 24
each right and down list are sorted.
Write a function flatten() which flattens this link list to a single link list with all the elements in sorted order as:
PI Round 1:
The interview started with discussions and questioning about the internship project and other projects mentioned in my Resume.
After the discussions about projects interviewer asked a question on string the question was:
- A string of length n and an integer m was given, give an algo. to rotate the string counter clockwise by m. I was asked to give all the check conditions for input m.
Then the interviewer asked me to write a code for the same with a strict guideline that there should not be any mistake in the code ;).
- After this he asked me about heap, min and max heap, insertion and deletion in a heap. He asked me to prove that the time complexity of inserting n elements in a heap.
At-least he asked about the uses of heap data structure and other data structure which are implemented using heap.
PI Round 2:
- What is the difference b/w abstract and interface class?
- Write a program to create single thread and print “Hello World”, stating all the arguments of createThread function?
- What is a deadlock and what are the condition necessary for the deadlock to occur?
- What is a cache memory and how it is implemented?
- Explain LRU, FIFO and other page replacement algorithms?
- write a code to implement LRU cache and then implement full cache memory?
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