---
title: "69. Sqrt(x)"
created: 2025-12-22
---
# 69. Sqrt(x)

## 题目 [**69. Sqrt(x)**](https://leetcode.com/problems/sqrtx/)

![[image-85e2e79c.png]]

## 思路分析

![[image-dff06c09.png]]

## 代码实现

```java
class Solution {
    public int mySqrt(int x) {
        if (x < 2) return x;
        int l=1,r=x/2;
        while(l<r){
            int mid=(l+r+1)>>>1;
            if ((long)mid*mid <= x) {
                l=mid;
            } else {
                r = mid - 1;
            }
        }
        return r;
    }
}
```

## 同类题型

## 视频讲解