auto save

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]
+
\ No newline at end of file
+
+
+def search(num):
+    num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+    high=len(num_list)-1
+    low=0
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if low<high:
+        if guess==num:
+            return guess
+        elif guess<num:
+            low=mid+1
+            search(num)
+        else:
+            high=mid-1
+            search(num)
+    else:
+        break
+
+search(9)