1. Write a method take a array and rotate number, to shift the elements in array to certain rotate number.
2. Write a method to keep count of number in a array, and output that.
3. Given a FileNode definition, write a method to traverse the whole file tree.
4. How to deal with the loop in file tree.

Question

1. Write a method take a array and rotate number, to shift the elements in array to certain rotate number.
2. Write a method to keep count of number in a array, and output that.
3. Given a FileNode definition, write a method to traverse the whole file tree.
4. How to deal with the loop in file tree.

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