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
+
+di = 0
+gao = len(num_list) - 1
+num1 = 0
+num = int(input("值："))
+
+while True:
+    num1 = (di + gao) // 2
+    if num_list[num1] == num:
+        print(num1)
+        break
+    elif num > num_list[num1]:
+        di = num1 + 1
+    elif num < num_list[num1]:
+        gao = num1 - 1
+    if di > gao:
+        print("列表中无此元素！")
+        break
+
+