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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+# 使用二分查找法，找出9和20在列表里面的索
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num=int(input("请"))
+low=0
+high=len(num_list)-1
+while True:
+    mid=(low+high)//2
+    if num_list[mid]==num:
+        print("找到了")
+        print(num,"的位置",mid)
+        break
+    elif num>num_list[mid]:
+        low=mid+1
+    elif num<num_list[mid]:
+        high=mid-1
+    if low>high:
+        print("没有找到")
+        break
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