1. What is @SpringBootApplication?

2. Can you give a real-life example of a tree data structure?

3. Write code for quick sort

4. Can you provide examples of OOP concepts using code, including coding for all the principles of Object-Oriented Programming?

5. Find Duplicates in an Array Given an array ARR of size 'N', where each integer is in the range from 0 to N - 1, identify all elements that appear more than once. Return the duplicate elements in any order. If no duplicates are found, return an empty array. Example: Input: T = 2N = 5, ARR = [0, 3, 1, 2, 3]N = 3, ARR = [0, 1, 2] Output: 3 Explanation: For the first test case, 3 is repeated. In the second test case, no duplicates are present. Constraints: 1 <= T <= 10^2 1 <= N <= 10^4 0 <= ARR[i] <= N - 1 Time Limit: 1 sec