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- a = list(map(int, input().strip().split()))
- k = int(input())
- left, right, flag = 0, len(a) - 1, False
- while left <= right:
- mid = (left + right) // 2
- if k == a[mid]:
- print(mid)
- flag = True
- break
- elif k < a[mid]:
- right = mid - 1
- else:
- left = mid + 1
- if not flag:
- print('Not exist!')
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