Xilinx Senior Software Engineer Interview Questions and Answers

Q1. Reserve Binary Search Tree
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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
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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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Major questions were around problem solving, strings

Q1. Basic questions around testing.
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Here they asked lots of logical reasoning questions and checked on how you approached different situations

Q1. Explained package and other details
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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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