319.js

/** ------------------------------------------------------------------------------
 * 
 * 2023-04-27
 * 319. Bulb Switcher
 * https://leetcode.com/problems/bulb-switcher/
 * 
 ------------------------------------------------------------------------------ */
/**
 * @param {number} n
 * @return {number}
 */
var bulbSwitch = function (n) {
  return Math.floor(Math.sqrt(n));
};

var bulbSwitch = function (n) {
  let count = 0;

  for (let i = 1; i * i <= n; i++) {
    count++;
  }
  return count;
};