# Amazon Interview Questions Python

### Reverse Words in a Sentence

Reverse the order of words in a given sentence (an array of characters). %0 node_1 “Hello World” node_2 “World Hello” node_1->node_2

Runtime Complexity: Linear, O(n)O(n)O(n)

Memory Complexity: Constant, O(1)O(1)O(1)

The steps to solve this problem are simpler than they seem:

• Reverse the string.
• Traverse the string and reverse each word in place.
• ### How many ways can you make change with coins and a total amount

Suppose we have coin denominations of [1, 2, 5] and the total amount is 7. We can make changes in the following 6 ways:

Memory Complexity: Linear, O(n)O(n)O(n)

To solve this problem, we’ll keep an array of size `amount + 1`. One additional space is reserved because we also want to store the solution for the `0` amount.

There is only one way you can make a change of `0`, i.e., select no coin so we’ll initialize `solution[0] = 1`. We’ll solve the problem for each amount, denomination to amount, using coins up to a denomination, `den`.

The results of different denominations should be stored in the array solution. The solution for amount `x` using a denomination `den` will then be:

We’ll repeat this process for all the denominations, and at the last element of the `solution` array, we will have the solution.

Given a set of ‘n’ elements, find their Kth permutation. Consider the following set of elements: %0 node_1 1 node_2 2 node_3 3

All permutations of the above elements are (with ordering):

Here we need to find the Kth permutation.

Runtime Complexity: Linear, O(n)O(n)O(n)

Memory Complexity: Linear, O(n)O(n)O(n)

Here is the algorithm that we will follow:

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Do you know that only about 2% of those who apply at Amazon get through? The tech giant has a pretty rigorous hiring process. The recruiters carefully select all the Amazon coding interview questions to test the overall abilities of the applicants.Â

To face the Amazon coding challenge questions, youâll need a lot of practice, guidance, and the correct strategy. As the company receives thousands of resumes every year, youâll need to ace your tech interview to get through.

If you intend to acing Amazonâs coding interview, you must adopt the right strategy. Without that, beating the stiff competition is an uphill climb.Â

In this article, weâll look at the type of Amazon coding interview questions you can expect. These are the things we will discuss:

• The Complete Amazon Interview Process
• Different Levels at Amazon
• Amazon Coding Interview Questions
• Scoring and Evaluating System at Amazon Interviews
• FAQs on Amazon Coding Interview Questions
• Before we get to Amazon coding interview questions, weâll begin with everything you need to know about how Amazon conducts its interviews and what theyâre looking for. Letâs jump right in!

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