mirror of
https://github.com/halfrost/LeetCode-Go.git
synced 2026-03-13 10:02:05 +08:00
添加 problem 704
This commit is contained in:
16
Algorithms/0704. Binary Search/704. Binary Search.go
Normal file
16
Algorithms/0704. Binary Search/704. Binary Search.go
Normal file
@@ -0,0 +1,16 @@
|
||||
package leetcode
|
||||
|
||||
func search704(nums []int, target int) int {
|
||||
low, high := 0, len(nums)-1
|
||||
for low <= high {
|
||||
mid := low + (high-low)>>1
|
||||
if nums[mid] == target {
|
||||
return mid
|
||||
} else if nums[mid] > target {
|
||||
high = mid - 1
|
||||
} else {
|
||||
low = mid + 1
|
||||
}
|
||||
}
|
||||
return -1
|
||||
}
|
||||
48
Algorithms/0704. Binary Search/704. Binary Search_test.go
Normal file
48
Algorithms/0704. Binary Search/704. Binary Search_test.go
Normal file
@@ -0,0 +1,48 @@
|
||||
package leetcode
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"testing"
|
||||
)
|
||||
|
||||
type question704 struct {
|
||||
para704
|
||||
ans704
|
||||
}
|
||||
|
||||
// para 是参数
|
||||
// one 代表第一个参数
|
||||
type para704 struct {
|
||||
nums []int
|
||||
target int
|
||||
}
|
||||
|
||||
// ans 是答案
|
||||
// one 代表第一个答案
|
||||
type ans704 struct {
|
||||
one int
|
||||
}
|
||||
|
||||
func Test_Problem704(t *testing.T) {
|
||||
|
||||
qs := []question704{
|
||||
|
||||
question704{
|
||||
para704{[]int{-1, 0, 3, 5, 9, 12}, 9},
|
||||
ans704{4},
|
||||
},
|
||||
|
||||
question704{
|
||||
para704{[]int{-1, 0, 3, 5, 9, 12}, 2},
|
||||
ans704{-1},
|
||||
},
|
||||
}
|
||||
|
||||
fmt.Printf("------------------------Leetcode Problem 704------------------------\n")
|
||||
|
||||
for _, q := range qs {
|
||||
_, p := q.ans704, q.para704
|
||||
fmt.Printf("【input】:%v 【output】:%v\n", p, search704(p.nums, p.target))
|
||||
}
|
||||
fmt.Printf("\n\n\n")
|
||||
}
|
||||
43
Algorithms/0704. Binary Search/README.md
Executable file
43
Algorithms/0704. Binary Search/README.md
Executable file
@@ -0,0 +1,43 @@
|
||||
# [704. Binary Search](https://leetcode.com/problems/binary-search/)
|
||||
|
||||
|
||||
## 题目:
|
||||
|
||||
Given a **sorted** (in ascending order) integer array `nums` of `n` elements and a `target` value, write a function to search `target` in `nums`. If `target` exists, then return its index, otherwise return `-1`.
|
||||
|
||||
**Example 1:**
|
||||
|
||||
Input: nums = [-1,0,3,5,9,12], target = 9
|
||||
Output: 4
|
||||
Explanation: 9 exists in nums and its index is 4
|
||||
|
||||
**Example 2:**
|
||||
|
||||
Input: nums = [-1,0,3,5,9,12], target = 2
|
||||
Output: -1
|
||||
Explanation: 2 does not exist in nums so return -1
|
||||
|
||||
**Note:**
|
||||
|
||||
1. You may assume that all elements in `nums` are unique.
|
||||
2. `n` will be in the range `[1, 10000]`.
|
||||
3. The value of each element in `nums` will be in the range `[-9999, 9999]`.
|
||||
|
||||
|
||||
## 题目大意
|
||||
|
||||
|
||||
给定一个 n 个元素有序的(升序)整型数组 nums 和一个目标值 target ,写一个函数搜索 nums 中的 target,如果目标值存在返回下标,否则返回 -1。
|
||||
|
||||
提示:
|
||||
|
||||
- 你可以假设 nums 中的所有元素是不重复的。
|
||||
- n 将在 [1, 10000]之间。
|
||||
- nums 的每个元素都将在 [-9999, 9999]之间。
|
||||
|
||||
|
||||
## 解题思路
|
||||
|
||||
|
||||
- 给出一个数组,要求在数组中搜索等于 target 的元素的下标。如果找到就输出下标,如果找不到输出 -1 。
|
||||
- 简单题,二分搜索的裸题。
|
||||
Reference in New Issue
Block a user