Lead Product Engineer
Lead Product Engineer Interview Questions and Answers
Q1. What is hash map, how its works internally, what its complexity for put and get data and their implementation areas
A hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
Hash map works by using a hash function to determine the index of the key-value pair in an array.
Complexity for putting data is O(1) on average, but can be O(n) in worst case scenarios.
Complexity for getting data is also O(1) on average, but can be O(n) in worst case scenarios.
Hash maps are commonly used in programming for fast lookups and data storage...read more
Q2. Find pairs with given sum in list of integers? arr = [8,7,2,5,3,1] and target = 10 result= [8,2,7,3]
Use a hashmap to store elements and their corresponding complements to find pairs with given sum in list of integers.
Iterate through the list of integers and store each element in a hashmap.
For each element, check if its complement (target - element) exists in the hashmap.
If the complement exists, add the pair to the result array.
Q3. What is linked hash map and its works internally and their complexity.
LinkedHashMap is a data structure that combines features of a linked list and a hash map.
Combines features of linked list and hash map
Maintains insertion order
Allows null keys and values
Access order can be maintained using constructor parameter
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