improve problem list UI#12

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Const1nt wants to merge 2 commits intoicpc:masterfrom

Const1nt:feature

Commits on Dec 16, 2025

add required balloons counter
Const1nt
committed

Commits on Dec 18, 2025

Sort carrying balloons in the order of team places instead of by time

nsychev
authored and
Const1nt
committed