nextPerfectSquare that returns the first perfect square that is greater than its integer argument

Write a function named nextPerfectSquare that returns the first perfect square that is greater than its integer argument. A perfect square is an integer that is equal to some integer squared. For example 16 is a perfect square because 16 = 4 * 4. However 15 is not a perfect square because there is no integer n such that 15 = n*n.

The signature of the function is

 int nextPerfectSquare(int n)

Examples

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