3M Software Engineer Interview Questions and Answers

Q1. Salary expectation .
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Q2. Why should I hire you?
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Q1. Mendix Advanced questions.
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Q2. Everything which you mentioned in your resume.
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Round duration - 30. minutes
Round difficulty - Easy

It was in the evening, question were moderate

Q1. 
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array i...read more
Ans. 
Count the total number of subsequences in which all elements are equal in an integer array.
• Iterate through the array and count the frequency of each element.

• Calculate the total number of subsequences for each element using the formula (frequency * (frequency + 1) / 2).

• Sum up the total number of subsequences for all elements and return the result modulo 10^9 + 7.
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Round duration - 30 minutes
Round difficulty - Easy

It was in the night around 9:00 PM.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Ans. 
Given an array and a target sum, find all pairs of elements that add up to the target sum.
• Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.

• If the complement exists, add the pair to the result list.

• Sort the pairs based on the first element and then the second element.

• Return the list of pairs as the final result.
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2 coding questions one was greedy and 2nd one was of dp.

Q1. Electrical fundamental and AC thoery
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Q1. Tell me about yourself.
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Q2. Why are you looking for a change?
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Q3. Why should we hire you?
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Q4. What are your salary expectations?
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Q1. PLC programming, TPM, MTTR, MTBF
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Q2. How to deal with chinese counterparts
Ans. 
Understand cultural differences, build relationships, communicate clearly and respectfully.
• Research and learn about Chinese culture and customs.

• Be patient and build relationships before discussing business.

• Communicate clearly and respectfully, avoiding direct confrontation.

• Be aware of nonverbal communication and body language.

• Use a translator if necessary.

• Be prepared for negotiations and understand the importance of sa...read more
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Q3. How to deal with colleagues
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Q1. Salary discussion, Why changing
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Q1. General questions
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Q2. Related to work profile
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