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
-bilibili = 5
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-low = 0
-high = len(num_list)-1
+import random
+num_list = []
+for i in range(1,101):
+    num_list.append(i)
+bilibili = random.choice(num_list)
 
 
-while low <= high:
-    mid = (high + low) // 2
-    guess = num_list[mid]
-    if guess == bilibili:
-        print("OK,索引是"+str(mid))
-        break
-    elif guess < bilibili:
-        low = mid + 1
-    elif guess > bilibili:
-        high = mid - 1
-if bilibili not in num_list:
-    print("NO")
+def a(num_list,bilibili):
+    low = 0
+    high = len(num_list)-1
+    while low <= high:
+        mid = (high + low) // 2
+        guess = num_list[mid]
+        if guess == bilibili:
+            return mid
+        elif guess < bilibili:
+            low = mid + 1
+        elif guess > bilibili:
+            high = mid - 1
\ No newline at end of file
+    return None
+
+b = a(num_list,bilibili)
+print("teacher:",bilibili)
+print("list",b)
\ No newline at end of file