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
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+a = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=len(a)-1
+num=int(input("请输入要猜的数："))
+while high>low:
+    mid=(low+high)//2
+    if num==a[mid]:
+        print("找到了在",mid)
+        break
+    elif a[mid]>num:
+        high=mid-1
+    else:
+        low=mid+1
\ No newline at end of file