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
+guess=9
+low=0
+high=9
+while low<=high:
+    mid=(low+high)//2
+    if guess==num_list[mid]:
+        print('找到了',guess,'的索引位置是',mid)
+        break
+    elif mid<guess:
+        low=mid+1
+    else:
+        high=low-1
+        print("没有",guess,"这个数")
+guess=20
+low=0
+high=9
+while low<=high:
+    mid=(low+high)//2
+    if guess==num_list[mid]:
+        print('找到了',guess,'的索引位置是',mid)
+        break
+    elif mid<guess:
+        low=mid+1
+    else:
+        high=low-1
+        print("没有",guess,"这个数")
\ No newline at end of file