### cf_blogger's blog

By cf_blogger, history, 3 days ago,

Below is the discussion thread to discuss all doubts/alternative solutions/better explanations for Problem D of Round #704.

• -2

 » 3 days ago, # |   0 Can someone please explain the proof to-It's not difficult to prove that the answer does not exist when k>a+b−2.How to solve if the condition that $k<=a$ is not met?
•  » » 3 days ago, # ^ | ← Rev. 2 →   0 same question how to solve for k<=a???please help
•  » » 2 days ago, # ^ | ← Rev. 2 →   0 Suppose TC is 3,4,2 Make the string x as 1110000 and y as 1110001 then just change the x[a+b-1-k] to 1 and you will get the required answer link to my solution , It is very easy to understand for k<=x https://codeforces.com/contest/1492/submission/108304677
 » 3 days ago, # |   +19 Why do people downvote it? That's what cf needs, discussion threads for the problems
•  » » 3 days ago, # ^ | ← Rev. 2 →   0 perhaps they think this discussion should underAnnouncement of Codeforces Round #704 (Div. 2)？I saw that lots of coders always discuss problems under the announcement of the contest
•  » » » 3 days ago, # ^ |   +3
•  » » » » 2 days ago, # ^ |   0 Sorry,I didn't see it.I agree with you.
•  » » 2 days ago, # ^ |   +8 It's good only when it is official. I mean say a lot of people start separate discussion threads, then it will be a lot of choas.