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Given two given numbers **a** and **b** where 1<=a<=b, find the number of perfect squares between a and b (a and b inclusive).

**Example 1:**

Input:a =9,b =25Output:3Explanation:There are 3 perfect squares between 9 and 25. They are 9, 16, and 25.

**Example 2:**

Input:a =1,b =7Output:2Explanation:There are 2 perfect squares between 1 and 7. They are 1, and 4.

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **numOfPerfectSquares()** which takes 2 Integers a and b as input and returns the number of perfect squares between a and b.

**Expected Time Complexity:** O(1)

**Expected Auxiliary Space:** O(1)

**Constraints:**

1 <= a <= b <= 10^{5}

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Perfect Squares in a Range

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