二分算法查找排序数组中元素下标

```python # 读取输入 n, m = map(int, input().split()) arr = [0] + list(map(int, input().split())) # 二分查找 left, right = 1, n while left <= right: mid = (left + right) // 2 if arr[mid] == m: print(mid) break elif arr[mid] < m: left = mid + 1 else: right = mid - 1 ``` ######[AI问答 | 132点数解答 | 2026-06-13 19:21:43]