auto save

diy.py

+num_list = [1,3,5,8,11,15,17,18,20,21]
+mid = (low+high)//2
+guess = num_list[mid]
+if guess == 17:
+    print('找到了！')
+elif guess < 17:
+    low = mid+1
+else:
+    high = mid-1
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