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You work as a data engineer at Agoda, a global travel booking platform. Agoda maintains two independent hotel inventory databases one for Asia-Pacific and one for Europe, each with different schemas but storing similar hotel and room availability data. Both databases are updated continuously by regional services.

How would you design a system to continuously synchronize hotel and room availability data between these two databases, ensuring consistency in the presence of ongoing updates?

Design a system to synchronize two continuously updated, schema-different hotel inventory databases at Agoda.

Cross-Region Inventory Sync

Batch & Stream Processing

You have a function that outputs a random integer between a minimum value, \(N\), and a maximum value, \(M\). Call this function \(X\).

Take the output from the random integer function and place it into another random function as the max value with the same min value \(N\). This second function you can call \(Y\).

<ol>
<li>What would the distribution of the samples look like?</li>

<li>What would be the expected value?</li>
</ol>

Given a function that outputs a random integer between a min value N and a max value M, and then uses the output as the max value for a second function with the same min N, what is the expected value?

Given a function that outputs a random integer between a min value N and a max value M, and then uses the output as the max value for a second function with the same min N, what is the expected value?

Random Seed Function I

What does the Law of Iterated Expectation state for two random variables X and Y?

What does the Law of Iterated Expectation state for two random variables X and Y?

Random Seed Function II

Random Seed Function

“Suppose you are given a matrix of integers. Your task is to write a function that returns the sum of the elements in the matrix.

Example 1:

Input:

<pre tabindex="0" class="chroma"><code>matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>matrix_sum(matrix) -&gt; 45
</code></pre>

Example 2:

Input:

<pre tabindex="0" class="chroma"><code>matrix = [[-1, -2, -3], [-4, -5, -6], [-7, -8, -9]]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>matrix_sum(matrix) -&gt; -45
</code></pre>

The function should be able to handle both positive and negative integers and should return the sum as an integer.

The task is to find the sum of all elements in a given matrix of integers.

Question	Topic	Difficulty	Ask Chance
Cross-Region Inventory Sync	Batch & Stream Processing	Hard	Very High
Random Seed Function	Probability	Medium	Medium
Sum of Matrix Elements	Data Structures & Algorithms	Easy	Low

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