LeetCode 算法题【Easy】：69. Sqrt(x)

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链接：https://leetcode.com/problems/sqrtx/

Question

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.

Example 1:

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

Example 2:

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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.

My Answer

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var mySqrt = function(x) {
    return Math.floor(Math.sqrt(x))
};

My Answer’s Performance

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