1. Array reverse, Expression tree and Binary tree. Simple In-Memory cache.
2. Merge 2 sorted arrays into a single one. Find duplicates no. in an array of natural no.
3. Function to return true if array contains three elements whose sum is X
4. When do you use HashMap vs TreeMap vs LinkedHashMap?
5. ArrayList vs LinkedList. How HashMap works internally.
6. Reverse a stack using just push and pop no extra space.
7. Design LLD for Instagram/ photo-sharing app, Design A Cron Job scheduler.
8. Design HLD for Twitter system/ automated parking lot to minimize the entry and exit times.

Question

1. Array reverse, Expression tree and Binary tree. Simple In-Memory cache. 
2. Merge 2 sorted arrays into a single one. Find duplicates no. in an array of natural no. 
3. Function to return true if array contains three elements whose sum is X
4. When do you use HashMap vs TreeMap vs LinkedHashMap? 
5. ArrayList vs LinkedList. How HashMap works internally. 
6. Reverse a stack using just push and pop no extra space. 
7. Design LLD for Instagram/ photo-sharing app, Design A Cron Job scheduler. 
8. Design HLD for Twitter system/ automated parking lot to minimize the entry and exit times.

PayPal

Domanda di colloquio di PayPal

Aziende seguite

Ricerche di lavoro