#69 - Sqrt(x)

Medium • View on LeetCode • View on GitHub

Problem Description

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.

Solution

/**
 * @param {number} x
 * @return {number}
 */
var mySqrt = function(x) {
  let result = 1;

  while (result * result <= x) {
    result++;
  }

  return result - 1;
};