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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+l=0
+h=len(num_list)-1
+n=9
+a=1
+while a==1:
+    m=(l+h)//2
+    s=num_list[m]
+    if s>n:
+        h=m-1
+        if l>=h:
+            print('没找到。')
+            a=0
+    elif s<n:
+        l=m+1
+        if l>=h:
+            print('没找到。')
+            a=0
+    else:
+        a=0
+        print( '第'+str(m+1)+'个。')