save project

my_search.py

@@ -6,4 +6,22 @@ for i in range(1, 101):
 num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
-def binary_search(alist,num):
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+def binary_search(alist,num):
+    # 使用二分查找法，找出9和20在列表里面的索引
+
+
+    l=0
+    h=len(alist)
+
+    while l<=h:
+        m=(l+h)//2
+        gn=alist[m]
+        if gn==num:
+            return m
+        elif gn<num:
+            l=m+1
+        elif gn>num:
+            h=m-1
+r=binary_search(alist,num)
+print(num)
+print(r'索引')
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