Sqrt(x)

08 Aug 2025 in Dev / Codingtest on CodingTest

• LeetCode Find the Index of the First Occurrence in a String
  • 문제
  • 예시
• 풀이

LeetCode Find the Index of the First Occurrence in a String

문제

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.

For example, do not use pow(x, 0.5) in c++ or x ** 0.5 in python.

예시

Example 1: Input: x = 4 Output: 2 Explanation: The square root of 4 is 2, so we return 2.

Example 2: Input: x = 8 Output: 2 Explanation: The square root of 8 is 2.82842…, and since we round it down to the nearest integer, 2 is returned.

풀이

class Solution:
    def mySqrt(self, x: int) -> int:
        return int(sqrt(x))