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]
+def shuzi(a,low,high):
+    mid=(low+high)//2
+    if low>high:
+        print("数字不存在")
+        return
+    if num_list[mid]==a:
+        print("找到了")
+        return
+    elif num_list[mid]<a:
+        shuzi(a,mid+1,high)
+    else:
+        shuzi(a,low,mid-1)
+shuzi(20,0,9)
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