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
+num = 20
+while high>=low:
+    mid = (high+low)//2
+    guess = num_list[mid]
+    if guess == num:
+        print("OK啦,索引是：",mid)
+        exit()
+    elif  guess < num:
+        low = mid + 1
+    else:
+        high = mid - 1
+print("没用的东西。")        
\ No newline at end of file