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]
+a=len(num_list)-1
+s=0
+for i in range(10):
+    c=(a+s)//2
+    f=num_list[c]
+    if f==17:
+        print('找到了')
+        break
+    elif f<17:
+        s=c+1
+    else: a=c-1
+        
+   
+        
+
+    
+