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
+low = 0
+high = len(num_list)-1
+a=20
+while True:
+
+    guess = (low+high)//2
+    if low<high:
+        if a == num_list[guess]:
+            print('找到了')
+            break
+        elif a>num_list[guess]:
+            low = guess+1
+        else:
+            high = guess-1
+    else:
+        print('没有')
+        break