The Xpo Logistics, Inc. Research Scientist interview guide, interview questions, salary data, and interview experiences.

Xpo Logistics, Inc. Research Scientist Interview Guide

Getting ready for an Research Scientist interview at Xpo Logistics, Inc.? The Xpo Logistics, Inc. Research Scientist interview span across 10 to 12 different question topics. In preparing for the interview:
<ul>
<li>Know what skills are necessary for Xpo Logistics, Inc. Research Scientist roles.</li>
<li>Gain insights into the Research Scientist interview process at Xpo Logistics, Inc..</li>
<li>Practice real Xpo Logistics, Inc. Research Scientist interview questions.</li>
</ul>
Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the Xpo Logistics, Inc. Research Scientist interview.


Getting ready for an Research Scientist interview at Xpo Logistics, Inc.? The Xpo Logistics, Inc. Research Scientist interview span across 10 to 12 different question topics. In preparing for the interview:

- Know what skills are necessary for Xpo Logistics, Inc. Research Scientist roles.
- Gain insights into the Research Scientist interview process at Xpo Logistics, Inc..
- Practice real Xpo Logistics, Inc. Research Scientist interview questions.

Interview Query regularly analyzes interview experience data, and we've used that data to produce this guide, with sample interview questions and an overview of the Xpo Logistics, Inc. Research Scientist interview.
        

Overview

We've gathered this data from parsing thousands of interview experiences sourced from members.

We've gathered this data from parsing thousands of interview experiences sourced from members.

Xpo Logistics, Inc. Research Scientist Interview Process

There are two lists of dictionaries representing friendship beginnings and endings: <code>friends_added</code> and <code>friends_removed</code>. Each dictionary contains the <code>user_ids</code> and <code>created_at</code> time of the friendship beginning /ending.

Write a function <code>friendship_timeline</code> to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending.

Note: There can be multiple instances over time when two people became friends and unfriended; only output lists when a corresponding friendship was removed.

Example:

Input:

<pre tabindex="0" class="chroma"><code>friends_added = [
 {&#39;user_ids&#39;: [1, 2], &#39;created_at&#39;: &#39;2020-01-01&#39;},
 {&#39;user_ids&#39;: [3, 2], &#39;created_at&#39;: &#39;2020-01-02&#39;},
 {&#39;user_ids&#39;: [2, 1], &#39;created_at&#39;: &#39;2020-02-02&#39;},
 {&#39;user_ids&#39;: [4, 1], &#39;created_at&#39;: &#39;2020-02-02&#39;}]

friends_removed = [
 {&#39;user_ids&#39;: [2, 1], &#39;created_at&#39;: &#39;2020-01-03&#39;},
 {&#39;user_ids&#39;: [2, 3], &#39;created_at&#39;: &#39;2020-01-05&#39;},
 {&#39;user_ids&#39;: [1, 2], &#39;created_at&#39;: &#39;2020-02-05&#39;}]
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>friendships = [{
 &#39;user_ids&#39;: [1, 2],
 &#39;start_date&#39;: &#39;2020-01-01&#39;,
 &#39;end_date&#39;: &#39;2020-01-03&#39;
 },
 {
 &#39;user_ids&#39;: [1, 2],
 &#39;start_date&#39;: &#39;2020-02-02&#39;,
 &#39;end_date&#39;: &#39;2020-02-05&#39;
 },
 {
 &#39;user_ids&#39;: [2, 3],
 &#39;start_date&#39;: &#39;2020-01-02&#39;,
 &#39;end_date&#39;: &#39;2020-01-05&#39;
 },
]
</code></pre>

Write a function friendship_timeline to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending. 

Friendship Timeline

Python & General Programming

The probability that it will rain tomorrow is dependent on whether or not it is raining today and whether or not it rained yesterday.

If it rained yesterday and today, there is a 20% chance it will rain tomorrow. If it rained one of the days, there is a 60% chance it will rain tomorrow. If it rained neither today nor yesterday, there is a 20% chance it will rain tomorrow.

Given that it is raining today and that it rained yesterday, write a function <code>rain_days</code> to calculate the probability that it will rain on the nth day after today.

Example:

Input:

<pre tabindex="0" class="chroma"><code>n=5
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>def rain_days(n) -&gt; 0.39968
</code></pre>

Given that it is raining today and that it rained yesterday, write a function to calculate the probability that it will rain on the nth day after today.

Rain in N Days

Probability

Design a database schema for a blogging platform. The schema should include tables for users, posts, comments, and tags. Describe the relationships between the tables, as well as any constraints you would apply.

Design a database schema for a blogging platform.

Question	Topic	Difficulty	Ask Chance
Friendship Timeline	Python & General Programming	Hard	Very High
Rain in N Days	Probability	Hard	Very High
Blogging Platform Schema	Data Modeling	Hard	High

Xpo Logistics, Inc. Research Scientist Interview Guide

Overview

Xpo Logistics, Inc. Research Scientist Interview Process

Xpo Logistics, Inc. Research Scientist Interview Questions