数组查找扫描器整数的索引

def linear_search(arr, target):
    for i in range(len(arr)):
        if arr[i] == target:
            return i
    return -1

# 示例
arr = [1, 2, 3, 4, 5]
target = 3
index = linear_search(arr, target)
print(f"目标值 {target} 的索引是: {index}")

def binary_search(arr, target):
    left, right = 0, len(arr) - 1
    while left <= right:
        mid = (left + right) // 2
        if arr[mid] == target:
            return mid
        elif arr[mid] < target:
            left = mid + 1
        else:
            right = mid - 1
    return -1

# 示例
arr = [1, 2, 3, 4, 5]
target = 3
index = binary_search(arr, target)
print(f"目标值 {target} 的索引是: {index}")

if index >= 0 and index < len(arr):
    print(arr[index])
else:
    print("索引越界")

arr.sort()
index = binary_search(arr, target)