parent
d3cc149c5a
commit
d95c628eef
@ -0,0 +1,24 @@
|
|||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
def binary_search_rotation(nums: list[int]) -> int:
|
||||||
|
"""二分查找左边界(双闭区间)"""
|
||||||
|
# 初始化双闭区间 [0, n-1] ,即 i, j 分别指向数组首元素、尾元素
|
||||||
|
i, j = 0, len(nums) - 1
|
||||||
|
while True:
|
||||||
|
m = (i + j) // 2 # 计算中点索引 m
|
||||||
|
if nums[m] < nums[j]:
|
||||||
|
j = m # 此情况说明 target 在区间 [m+1, j] 中
|
||||||
|
elif nums[m] > nums[j]:
|
||||||
|
i = m + 1 # 此情况说明 target 在区间 [i, m-1] 中
|
||||||
|
else:
|
||||||
|
return i # 此情况说明 i == j == m ,找到旋转点
|
||||||
|
|
||||||
|
|
||||||
|
"""Driver Code"""
|
||||||
|
if __name__ == "__main__":
|
||||||
|
nums: list[int] = [23, 67, 70, 92, 1, 3, 6, 8, 12, 15]
|
||||||
|
|
||||||
|
# 二分查找左边界
|
||||||
|
index_left = binary_search_rotation(nums)
|
||||||
|
print("数组旋转点的索引 = ", index_left)
|
Loading…
Reference in new issue