For those who strugled to solve div2 A problem this video may help you to understand it↵
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https://www.youtube.com/watch?v=8rhnRzicPlc↵
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You can write your thoughts on other problems in the comments↵
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UPD: For those who strugled to solve div2 B problem this video can be useful:↵
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https://www.youtube.com/watch?v=4Q2VH6VHuSk
↵
↵
https://www.youtube.com/watch?v=8rhnRzicPlc↵
↵
You can write your thoughts on other problems in the comments↵
↵
UPD: For those who strugled to solve div2 B problem this video can be useful:↵
↵
https://www.youtube.com/watch?v=4Q2VH6VHuSk