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SAP Developer Associate Interview Questions and Answers

Updated 17 Feb 2024

Q1. Reverse a Linked List Iteratively

You are given a singly linked list of integers. The task is to return the head of the reversed linked list.

Example:

Input:
The given linked list is 1 -> 2 -> 3 -> 4 -> NULL.
O...read more
Ans.

Reverse a singly linked list iteratively and return the head of the reversed linked list.

  • Iterate through the linked list and reverse the pointers to point to the previous node instead of the next node.

  • Keep track of the previous, current, and next nodes while traversing the linked list.

  • Update the head of the reversed linked list to be the last node encountered.

  • Time complexity: O(N), Space complexity: O(1).

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Q2. Uncommon Characters Problem Statement

Given two strings str1 and str2 containing only lowercase alphabets, find the characters that are unique to each string, i.e., characters that occur in only one of the stri...read more

Ans.

Find uncommon characters in two strings and return them in lexicographically sorted order.

  • Iterate through each character in both strings and keep track of their frequency using a hashmap.

  • Iterate through the hashmap and add characters with frequency 1 to the result array.

  • Sort the result array in lexicographical order and return it.

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Q3. Inorder Successor in a Binary Tree

Given a node in an arbitrary binary tree, find its inorder successor. The successor is defined as the node that appears immediately after the given node in the in-order traver...read more

Ans.

Given a node in a binary tree, find its inorder successor in the tree.

  • Traverse the tree in in-order fashion to find the successor node.

  • If the given node has a right child, the successor will be the leftmost node in the right subtree.

  • If the given node does not have a right child, backtrack to the parent nodes to find the successor.

  • Handle the case where the given node is the last node in the in-order traversal.

  • Return the value of the successor node or 'NULL' if no successor exi...read more

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Q4. How to reverse a linked list and write program to get right view of a binary tree.

Ans.

To reverse a linked list, we need to traverse the list and change the direction of the pointers. To get the right view of a binary tree, we need to traverse the tree and keep track of the rightmost node at each level.

  • To reverse a linked list, we can use three pointers to keep track of the current, previous, and next nodes.

  • To get the right view of a binary tree, we can use a queue to traverse the tree level by level and keep track of the rightmost node at each level.

  • Both opera...read more

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Discover SAP interview dos and don'ts from real experiences

Q5. design a calculator that does operations on 128 bit integers.

Ans.

Design a calculator that performs operations on 128 bit integers.

  • Use a data structure like an array to store the 128 bit integers.

  • Implement functions for addition, subtraction, multiplication, and division.

  • Consider handling overflow and underflow cases.

  • Use bitwise operations for efficient calculations.

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Q6. Subjects you are comfortable with

Ans.

I am comfortable with various subjects related to software development.

  • Programming languages (e.g. Java, Python, C++)

  • Web development (e.g. HTML, CSS, JavaScript)

  • Database management (e.g. SQL, MongoDB)

  • Software testing and debugging

  • Version control systems (e.g. Git)

  • Object-oriented programming concepts

  • Algorithms and data structures

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Q7. what are binary trees?

Ans.

Binary trees are hierarchical data structures composed of nodes, where each node has at most two children.

  • Consists of nodes with at most two children - left and right

  • Each node can have zero, one, or two children

  • Used in various applications like binary search trees, expression trees, etc.

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Interview Process at SAP Developer Associate

based on 8 interviews
4 Interview rounds
Coding Test Round
Technical Round - 1
Technical Round - 2
Personal Interview1 Round
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