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First of all, I didn't even come to know when this editorial came.

In D, there was the constraint "Each person needs S or M, M or L, L or XL" and so on.

I was wondering how to solve D

if this constraint is removed. I was trying to maintain what all people are left with just a SINGLE choice, so I have no option but to give them the t-shirt of their choice, and on doing so, find new people that are left with single choice.Ofcourse, this can stop mid-way, and we would be left with people having exactly two choices. But I couldn't analyse how to proceed ahead. My failed attempt

You can just build a network and run max flow on it and it will pass since the graph is special.

That's cool. Then I guess this problem from last contest is also basically the same but with cost assigned to each edge.(MinCostMaxFLow) I am new to the concept of max flow, but let me know whether I am thinking correct or not. Also can you share some AC codes on CF/CC where you used MaxFlow and MinCostMaxFlow because I am not able to find a good template for them.

Try this.My solution 17710740.

Your implementation is not the fastest right? So instead of adjacency matrix, i should implement it with vectors and that would be the best code in terms of time complexity?

Can you please explain what do u mean by the graph is special and how will it pass using max flow algorithms?