Problem from LeetCode
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.
E.g - 1
Input : 4
Output: : 2
E.g - 2
Input : 8
Output: : 2
Explanation : The square root of 8 is 2.82842..., and since the decimal part is truncated, 2 is returned.