Sqrt(x)

Feb 09, 2018

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;
};