save project

binary_search.py

-# 使用二分查找法，找出9和20在列表里面的索引
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
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+q=20# 使用二分查找法，找出9和20在列表里面的索引
+w = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=len(w)-1
+while low  <=high:
+    mid = (low+high)//2
+    e=w[mid]
+    if e==q:
+        print('OK它是',mid)
+        break
+    elif e<q:
+        low=mid+1
+    elif e<q:
+        low=mid-1
+    
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