Prasadam Restaurant Interview Questions and Answers

Session is maintained through session affinity or sticky sessions.

• Session affinity ensures that a user's session is always directed to the same server.

• Sticky sessions use cookies to track the user's session and direct them to the same server.

• Load balancers can also use IP-based affinity to maintain sessions.

• Session persistence can be configured based on time or number of requests.

• Without session affinity, users may experience issues with lost data or inconsistent behavior.

To burn a wood of some size in 15 min instead of 30 min, split it into two halves and burn them simultaneously.

• Split the wood into two halves

• Burn both halves simultaneously

• Use a larger flame or accelerant to increase the burning rate

To implement critical section in Java, use synchronized keyword on the shared variable.

• Use synchronized keyword to ensure only one thread can access the shared variable at a time.

• The shared variable should be the object on which the synchronized keyword is applied.

• Example: synchronized(sharedObject) { //critical section code }

Find missing element in an array of elements from 0 to n-1 using different approaches.

• Approach 1: Sum of n natural numbers - sum of array elements

• Approach 2: XOR all array elements and XOR with n natural numbers

• Approach 3: Binary search for missing element

• Approach 4: Using a hash table to store array elements

Find the first non-repeating character in a string.

• Create a hash table to store character frequency

• Iterate through the string and check frequency in hash table

• Return the first character with frequency 1