When input is 201, the answer is 141.
However, if you use a brute-force method to count, you will find it should be 120.
Is that answer wrong?
0~99 there 20 ones;
100~199 there 100+20 ones;
200~201 there 1 one.
So the answer is 141
Thanks for your reply!
I thought it was counting the numbers containing 1 rather than how many "1"s.
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