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Problem E. Cosmic Rays from last Div1 + Div2 Round had an interesting application of stack. So, I created a video editorial to help you visualize stack problems using graph modelling.
https://youtu.be/l2LTxerp2KE?si=FQzjaNj1Y-QiMH1V
I also created a practice contest https://mirror.codeforces.com/group/7Dn3ObOpau/contest/542909
Can you recommend some graph modelling problem and also what is graph modelling.