Qualcomm Senior Business Analyst Interview Questions and Answers

Major questions were around problem solving, strings

Q1. Add two linked list
Ans. 
To add two linked lists, iterate through both lists simultaneously and add corresponding nodes, considering carry from previous addition.
• Create a dummy node to hold the result.

• Initialize current node to dummy node.

• Iterate through both lists, adding values and carry from previous addition.

• Move to next nodes in both lists.

• Handle cases where one list is longer than the other.

• Handle final carry if present.
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Q2. Find shortest path in graph
Ans. 
Use Dijkstra's algorithm to find the shortest path in a graph
• Implement Dijkstra's algorithm to find the shortest path between two nodes in a graph

• Maintain a priority queue to keep track of the shortest distance to each node

• Update the shortest distance to each node as you traverse the graph

• Track the path by storing the previous node for each node visited
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Q1. Check tree is BST
Ans. 
Check if a binary tree is a Binary Search Tree (BST)
• Perform an in-order traversal of the tree and check if the resulting array is sorted

• Keep track of the previous node value during traversal to compare with the current node value

• Ensure that each node's value is greater than the previous node's value in the in-order traversal
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Q2. Check substring palindrome or not
Ans. 
Check if a substring in an array of strings is a palindrome or not.
• Iterate through each string in the array

• For each string, check if any of its substrings are palindromes

• Return true if a palindrome substring is found, false otherwise
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Q1. Reverse linked list recursively
Ans. 
Reverse a linked list recursively
• Create a recursive function to reverse the linked list

• Pass the current node and its next node as parameters

• Update the next pointer of the current node to point to the previous node
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Q2. Check if two stacks are equal
Ans. 
Check if two stacks are equal by comparing each element in the stacks
• Pop elements from both stacks and compare them one by one

• If the sizes of the stacks are different, they are not equal

• If any element in the stacks is different, they are not equal
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Q1. Dsa questions , angular , .net core and SQL
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OOPS Principle.
SQL
Java Coding Round - with easy level of questions

Q1. Write your own stack?
Ans. 
A stack is a linear data structure that follows the Last In First Out (LIFO) principle.
• Implement using an array or linked list

• Push operation adds element to top of stack

• Pop operation removes element from top of stack

• Peek operation returns top element without removing it
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Q2. How to find intersection happened between two linked list?
Ans. 
To find intersection of two linked lists, traverse both lists and compare each node.
• Traverse both linked lists and compare each node

• Use two pointers, one for each linked list

• If a node is common, return the node

• If both pointers reach the end, return null
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