Implement int sqrt(int x)
.
Compute and return the square root of x.
x is guaranteed to be a non-negative integer.
Example 1:
Input: 4
Output: 2
Example 2:
Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842…, and since we want to return an integer, the decimal part will be truncated.
In numerical analysis, a branch of mathematics, there are several square root algorithms or methods of computing the principal square root of a non-negative real number. For the square roots of a negative or complex number, see below.
Solution:
var mySqrt = function(x) { var i=x; while (i*i > x) { i = (i+x/i)/2; } return i; };