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Update0704.二分查找 Go示例代码

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添加注释、计算区间中点mid时使用位运算代替除法运算
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cherrypicker
2023-12-21 15:29:18 +08:00
parent 3d26c1e313
commit 25a330fcdb
1 changed files with 46 additions and 26 deletions
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problems/0704.二分查找.md
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@ -251,40 +251,60 @@ class Solution:
（版本一）左闭右闭区间
```go
// 时间复杂度 O(logn)
func search(nums []int, target int) int {
high := len(nums)-1
low := 0
for low <= high {
mid := low + (high-low)/2
if nums[mid] == target {
return mid
} else if nums[mid] > target {
high = mid-1
} else {
low = mid+1
}
}
return -1
// 初始化左右边界
left := 0
right := len(nums) - 1
// 循环逐步缩小区间范围
for left <= right {
// 求区间中点
mid := left + (right-left)>>1
// 根据 nums[mid] 和 target 的大小关系
// 调整区间范围
if nums[mid] == target {
return mid
} else if nums[mid] < target {
left = mid + 1
} else {
right = mid - 1
}
}
// 在输入数组内没有找到值等于 target 的元素
return -1
}
```
（版本二）左闭右开区间
```go
// 时间复杂度 O(logn)
func search(nums []int, target int) int {
high := len(nums)
low := 0
for low < high {
mid := low + (high-low)/2
if nums[mid] == target {
return mid
} else if nums[mid] > target {
high = mid
} else {
low = mid+1
}
}
return -1
// 初始化左右边界
left := 0
right := len(nums)
// 循环逐步缩小区间范围
for left < right {
// 求区间中点
mid := left + (right-left)>>1
// 根据 nums[mid] 和 target 的大小关系
// 调整区间范围
if nums[mid] == target {
return mid
} else if nums[mid] < target {
left = mid + 1
} else {
right = mid
}
}
// 在输入数组内没有找到值等于 target 的元素
return -1
}
```