link to the problem is here https://cses.fi/problemset/task/2187
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link to the problem is here https://cses.fi/problemset/task/2187
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A blog on catalan convolution
acraider has explained both the versions (Bracket Sequence I and Bracket Sequence II) on his youtube channel. I am linking to the part of the video from where he started explaining the first version. Link: https://youtu.be/M5PbeUrOsDw?t=2967. I recommend you go through his explanation and insights for both parts.