Freecharge Team Lead Interview Questions, Process, and Tips

Q1. Find first non-repeating character in a string
Ans. 
Find the first non-repeating character in a string
• Create a hashmap to store the frequency of each character in the string

• Iterate through the string and check the frequency of each character

• Return the first character with frequency 1
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Q2. Implement stack in a way so that I will get min at any step in 0(1)
Ans. 
Use an additional stack to keep track of the minimum value at each step.
• Create a stack to store the actual values.

• Create another stack to store the minimum value at each step.

• When pushing a new value, compare it with the top of the minimum stack and push the smaller value.

• When popping a value, also pop from the minimum stack.

• To get the minimum value at any step, simply peek at the top of the minimum stack.
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Q1. Print even odd with different threads
Ans. 
Print even and odd numbers using different threads
• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure proper ordering of output

• Example: Thread 1 prints even numbers (2, 4, 6, ...) and Thread 2 prints odd numbers (1, 3, 5, ...)
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Q2. Executor service, java 8, spring boot
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Q1. Design LRU cache
Ans. 
LRU cache is a data structure that stores the most recently used items, discarding the least recently used items when full.
• Use a doubly linked list to keep track of the order of items based on their usage.

• Use a hashmap to quickly access items in the cache.

• When an item is accessed, move it to the front of the linked list to mark it as the most recently used.
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Q2. Design flight booking system
Ans. 
Design a flight booking system for easy and efficient booking process.
• Allow users to search for flights based on destination, date, and number of passengers.

• Provide options for users to select preferred flight times, airlines, and seating preferences.

• Include secure payment processing for booking confirmation.

• Implement a user-friendly interface with clear instructions and easy navigation.

• Offer features like flight statu...read more
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Q1. Aap kaha kaam kiye hoo kitna year ka experience hai aapka
Ans. Sales team leader from Resilient innovation private limited
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Q2. Kitna year ka experience hai aapko
Ans. 5 year for sales team leader
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Q3. Aapki city konsi hai
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Q1. Aap freecharge ke bare me kya jante hoo
Ans. Freecharge ek maatra aise company hai jiska type axis Bank se hai
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Q2. Agar hamari company ka soundbox
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Coding, stack and string

Q1. Java 8, collection, multithreading
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