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]
+for i in range(int(input("有几个数字"))):
+    a=int(input("数字："))
+    low=0
+    high=len(num_list)-1
+    for i in range(30):
+        mid=(low+high)//2
+        if a==num_list[mid]:
+            print("找到了!索引是"+str(mid))
+            break
+        elif a<num_list[mid]:
+            high=mid-1
+        elif a>num_list[mid]:
+            low=mid+1
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