Answer / Shivanshu

In many programming languages, the built-in data structures like sets or hash maps can be used to efficiently find duplicates in an array. Here is an example using Python:
```
numbers = [1, 2, 3, 4, 4, 5, 6]
duplicates = set()
for num in numbers:
if num in duplicates:
print(num)
else:
duplicates.add(num)
```

explain how to make a control visible and invisible during runtime

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Given a Binary Search Tree, write a program to print the kth smallest element without using any static/global variable. You can?t pass the value k to any function also.

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