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]
+low=0
+high=9
+numa=9
+numb=20
+
+while high>=low:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess==numa:
+        print("找到了！索引是",mid)
+        break
+    elif guess<numa:
+        low=mid+1
+    else:
+        high=mid-1
+if high<low:
+    print("没找到")
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