*Last updated: Nov 27, 2022*

Difficulty | Runtime | Faster_than | Memory | Lesser_than |
---|---|---|---|---|

easy | 97 ms | 84.86 % | 42.2 mb | 13.66 % |

Difficulty : easy

Runtime : 97 ms Faster than 84.86 %

Memory : 42.2 mb Lesser than 13.66 %

# 69. Sqrt(x)

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**:
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.

**Constraints**:

- 0 <= x <= 231 - 1

## Solution:

```
/**
* @param {number} x
* @return {number}
*/
var mySqrt = function(x) {
if (x < 2) return x
var l = 1
var r = x
while (l <= r) {
m = l + ((r - l) / 2) ^ 0
if(m > x / m) {
r = m - 1
} else if ((m + 1) > x / (m + 1)) {
return m
} else l = m + 1
}
};
```