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
+num=int(input(''))
+mina=0
+maxa=len(num_list)-1
+while mina<=maxa:
+    mid=(mina+maxa)//2
+    g=num_list[mid] 
+    if g==num:
+        print('索引为：',mid)
+        break
+    elif g<num:
+        mina=mid+1
+    else g>num:
+        maxa=mid-1
+if mina>maxa:
+    print('不存在这个数')      
\ No newline at end of file