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
 # 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]
+def erfen(num,low,high):
\ No newline at end of file
+    while(True):
+        mid=(low+high)//2
+        guess=num_list[mid]
+        if guess==num:
+            return mid
+        elif low>high:
+            return 0
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+if erfen(9,0,len(num_list)-1)==0:
+    print("没找到")
+else:
+    print(erfen(9,0,len(num_list)-1))
+if erfen(20,0,len(num_list)-1)==0:
+    print("没找到")
+else:
+    print(erfen(20,0,len(num_list)-1))
\ No newline at end of file