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]
+# 使用二分查找法，找出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
+big=len(num_list)-1
+small=0
+while small<big:
+    mid=(big+small)//2
+    guess=num_list[mid]
+    if guess==20:
+        print("找到了,索引值是",mid)
+        break
+    elif mid < big:
+        small=mid+1
+    else:
+        big=mid-1
\ No newline at end of file