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)
+a = int(input('number'))
+while True:
+    if not high<low:
+        mid = (low + high)//2
+        x = num_list[mid]
+        if x == a:
+            print(str(a) + '在num_list中的索引是'+str(mid))
+            break
+        elif x > a:
+            high = mid-1
+        else:
+            low = mid+1
+    else:
+        print(str(a) + '不在num_list中')
+        break
+