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By Bovmelo, history, 6 weeks ago, In English

As known, 1720D1 - Xor-Subsequence (easy version) has an ambiguous descriptioin. I'm the one of those who got misled during the contest. However, the misunderstood problem is solutable. Let's have a look.

It is the misunderstood version of the problem. The only difference is that in this version $$$b_i$$$ do be the subsequence of $$$a$$$, where any $$$b_i$$$ is an element of $$$a$$$. Note that $$$a_i<200$$$ remains true.

Hint 1
Hint 2
Hint 3
solution

However, I had no idea how to solve the misunderstood D2. Could anyone help me?

 
 
 
 
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As I promised in my previous comments, I made this blog.