Amazon Interview On-Campus For Internship – 1
Online Round Coding Question:
Q1. Given a float number 7.64, convert it into the string WITHOUT using any inbuilt function/library.
for eg:
input
float no.: 7.64
output
string: 7.64
Answer : Click here
Q2. Given the inorder and preorder traversals of a Binary Tree, output the postorder traversal of it.
Answer : Click here
Round 1 written:
Q1. Given a string find the length of longest substring which has none of its character repeated?
for eg:
i/p string:
abcabcbb
length of longest substring with no repeating charcters: 3 (abc)
Answer : Click Here
Q2. 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 8 14 20 | | | | 11 8.5 19 22 | | | 12 13 24 | 15
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:
5->6->7->8->9->10->11->12->13->14->15->18->19->20->22->24
Answer : Click Here
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:
Q1. 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 ;).
Q2. 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:
Q1) What is the difference b/w abstract and interface class?
Q2) Write a program to create single thread and print “Hello World”, stating all the arguments of createThread function?
Q3) What is a deadlock and what are the condition necessary for the deadlock to occur?
Q4) What is a cache memory and how it is implemented?
Q5) Explain LRU, FIFO and other page replacement algorithms?
Q6) Write a code to implement LRU cache and then implement full cache memory? Answer Click Here
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