What should I learn first data structures or algorithms?
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Which is better hashmap or arraylist?
Is quicksort faster than merge sort?
Which sort is best for linked list?
Can we extend an array after initialization?
How are elements stored in hashset?
Is hashset thread safe?
Tell me real world example of polymorphism and encapsulation .
Why is data structure needed?
What is array define its types?
Define a queue?
How many sorting techniques are there?
What are the 3 types of variables?