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binary search in recursive [o(logn)]
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| def binary_search(a:list,target:int)->str: ##found, notfound | |
| if len(a)==0:return "NOT FOUND" | |
| a.sort() | |
| mid = len(a)//2 | |
| if a[mid]== target:return "FOUND" | |
| else: | |
| if a[mid] < target:return binary_search_re(a[mid+1:],target) | |
| if a[mid] > target:return binary_search_re(a[:mid],target) |
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