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user@intervues:~/$
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.
For example, do not use pow(x, 0.5) in C++ or x ** 0.5 in Python.
The square root of 8 is 2.82842..., and since we round it down to the nearest integer, 2 is returned.