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Sqrt(x)
Given a non-negative integer x, return the square root of x rounded down to the nearest integer.
Given a non-negative integer x, return the square root of x rounded down to the nearest integer. The returned integer should be non-negative as well.
You must not use any built-in exponent function or operator.
Example 1
Input: x = 4
Output: 2
Explanation: The square root of 4 is 2, so we return 2.
Example 2
Input: x = 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since we round it down to the nearest integer, 2 is returned.
Constraints
- 0 <= x <= 231 - 1
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