Implement int sqrt(int x).
Compute and return the square root of x, where x is guaranteed to be a non-negative integer.
Since the return type is an integer, the decimal digits are truncated and only the integer part of the result is returned.
Example 1:
Input: 4
Output: 2
Example 2:
Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since 
             the decimal part is truncated, 2 is returned.
class Solution:
     def mySqrt(self, x):
         """
         :type x: int
         :rtype: int
         """
         a = x**0.5
 
         return math.floor(a)
class Solution:
     def mySqrt(self, x):
         """
         :type x: int
         :rtype: int
         """
         a = x**0.5
 
         return math.floor(a)