3. Multithreading and Concurrency
a. What is the difference between synchronized method and synchronized block?
b. How does the volatile keyword work in Java?
c. What is the difference between wait() and sleep() methods?
d. What is a CountDownLatch in Java? How is it different from a CyclicBarrier?
e. What is the Java Memory Model (JMM)?
f. Explain ThreadLocal class and its use cases.
g. How do you prevent deadlocks in Java multithreading?

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Find the number whose square value is nearest to the given number
Given Number --> 47
Expected number--> 7
Explanation: 7*7=49, which is the nearest square value to 47

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Best Explanation of 2 pointers


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Problem Statement
Given an integer array nums sorted in non-decreasing order, remove the duplicates in place such that each unique element appears only once. The relative order of the elements should be kept the same. Return the new length of the array after duplicates are removed.

Note: You must modify the input array in place with O(1) extra memory.

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