FICO Software Developer Interview Questions, Process, and Tips

Q1. Hashmap working
Ans. 
Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hashmap uses a hashing function to map keys to indices in an array.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• In Java, HashMap is a commonly used implementation of the Map interface.
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Q1. Where are you from
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Q1. What is a red black tree
Ans. 
A red-black tree is a self-balancing binary search tree with additional properties to ensure balance and efficient operations.
• Red-black trees have nodes colored red or black, with rules to maintain balance during insertion and deletion.

• Each node has an extra bit for color, and the tree must satisfy properties like no two red nodes in a row.

• Operations like insertion and deletion involve rotations and color changes to ma...read more
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1 Hour, Basic Java, Array, DSA Questions

Q1. Valid Indian Mobile no.
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Q2. Binary Search on Linked List
Ans. 
Binary search on a linked list involves dividing the list into halves and searching for the target value.
• Linked list must be sorted before binary search can be performed.

• Binary search on linked list has a time complexity of O(log n).

• The middle element of the linked list is found using slow and fast pointers.

• If the target value is less than the middle element, search the left half of the list. If it's greater, search th...read more
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Q3. Palindrome string by all Efficient methods
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A palindrome string is a string that reads the same backward as forward. Efficient methods include using two pointers and reversing the string.
• Use two pointers, one starting from the beginning and the other from the end, and compare the characters at each position until they meet in the middle.

• Reverse the string and compare it to the original string. If they are the same, it is a palindrome.

• Use recursion to check if th...read more
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