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]
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+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+def lll(n):
+    low=0
+    high=len(num_list)-1
+    while True:
+        mid=(low+high)//2
+        guess=num_list[mid]
+        if guess==n:
+            print("找到了，索引为：")
+            print(mid)
+            break
+        elif guess<n:
+            low=mid+1
+        else:
+            high=mid-1
+        if low>high:
+            print("找不到")
+            break
+lll(3)
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