param { number } x return { number } function Sqrt ( x ) { let left = 0 ; let right = Math . ceil ( x / 2 ) ; while ( left < right ) { let mid = Math . ceil ( left + ( right - left ) / 2 ) ; let num = mid * mid ; if ( num > x ) { right = mid - 1 ; } else { left = mid ; } } return left ; } export { Sqrt } ;