Deutsche Bank Software Developer Interview Questions, Process, and Tips

It was data structures and algorithm

Q1. What is friend function
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Q2. Basic definitions of oops
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Q1. Objects in java 8
Ans. 
Java 8 introduced the concept of functional programming with the addition of lambda expressions and streams.
• Lambda expressions allow for concise code and easier parallel programming.

• Streams provide a way to work with collections of objects in a functional style.

• Functional interfaces like Predicate, Function, and Consumer are commonly used with lambda expressions.
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Q2. Spring boot basic concepts
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Q1. Coding challenge in java 8
Ans. 
Implement a coding challenge in Java 8
• Use lambda expressions and functional interfaces to write concise and readable code

• Utilize streams to process collections efficiently

• Leverage method references for cleaner code
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Q2. Personal project architecture questions
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Round duration - 90 minutes
Round difficulty - Medium

The coding round consisted of 3 coding questions. 1st question was of 20 marks, 2nd and 3rd of 50 marks.

Q1. 
Minimum Number of Operations Problem Statement
Given an array 'ARR' consisting of 'N' positive integers, determine the minimum number of operations needed to make all elements of the array equal. You may ...read more
Ans. Brute Force
For making all elements equal you can select a target value and then you can make all elements equal to that. Now, for converting a single element to a target value you can perform a single operation only once. In this manner, you can achieve your task in the maximum of  ‘N’ operations but you have to minimize this number of operations and for this, your selection of target is very important because if ...read more
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Q2. 
Avoiding Traps Problem Statement
Given an array of obstacles' coordinates, determine the minimal jump length to reach beyond all obstacles starting from coordinate 0 while avoiding landing on any obstacle...read more
Ans. 
I first made an array in the main function that will contain the number of prime numbers less than or equal to the index value of the array and passed into my called function. This will give me the a value for each test case. Then, int the called function I applied dynamic programming. I created a dp array and initialized all values to max integer (dp[0] = 0). For each index i, i put dp[i+1] if (i=(r1/r2)) equal to min...read more
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Q3. 
Longest Consecutive Sequence Problem Statement
You are given an unsorted array/list ‘ARR’ of ‘N’ integers. Your task is to return the length of the longest consecutive sequence.
The consecutive sequence ...read more
Ans. Brute Force
As we only need the consecutive elements in the form ['NUM', 'NUM' + 1, 'NUM' + 2,...,'NUM' + 'L']. The brute force approach is to traverse each element in the array ('NUM' = ‘ARR[i]’) and then keep finding ('NUM' + 1) in the array until we don't find the next consecutive element in the array.
 
Keep a track of the current length of the sequence. If the current length of the consecutive subsequence is gre...read more
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Round duration - 45 minutes
Round difficulty - Easy

Timing: 10:15 - 11:00 am.
The interview was online from home.

Round duration - 45 minutes
Round difficulty - Medium

Timing: 2:15 - 3:00 PM
The interview was online from home.
There were a few audio cuts in the video call but we were able to manage regardless.

Q1. 
Reverse a String Problem Statement
Given a string STR containing characters from [a-z], [A-Z], [0-9], and special characters, determine the reverse of the string.
Input:
The input starts with a single i...read more
Ans. 
He asked me to write a function to reverse a string of size n. In this question I defined my string ans="" , then iterated i from n-1 to 0 and concatenated Character.toString(s.charAt(i)) to my ans and then returned ans. He followed up the question. He said “If I remove ' ”="" ' in string ans line then what will happen. I answered that it will give me a compilation error that the variable "ans" is not initialized. Then...read more
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