My friend, I still don’t know how many numbers 1 I wrote until 199. Now let the editor of Source Code Network introduce to you how many numbers 1 has been written by the master of imagination 1 to 199.
Question: From 1 to 199, how many numbers 1 are written in total?
Answer: 140
Analysis: You can take a pen and count how many numbers "1" there are from 1 to 199. Note that as long as there is 1 in a number, it counts as one. For example, 11 counts as two 1's.