I am trying to solve this problem. The editorial for this problem uses the following approach
Can anyone explain me the Inclusion-Exclusion formula shown here?
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Let me suggest a good tutorial for this topic.
https://codeforces.me/blog/entry/64625
Once you understand the tutorial, the problem should become easier :)
lol, that is the exact same problem as https://dmoj.ca/problem/acc7p4. I copy pasted my code and passed.