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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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+high=len(num_list)-1
+low=0
+a=20
+while low<=high:
+    mid=(high+low)//2
+    guess=num_list[mid]
+    if a == guess:
+        print(mid)
+        break
+    elif mid>guess:
+        high=mid-1
+    elif mid<guess:
+        low=mid+1
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