Flannel
Flannel contains solutions with explanations to selected solved problems.
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number-theory
1062B. Math
736B. Taxes
combinatorics
131C. The World is a Theatre
584B. Kolya and Tanya
610A. Pasha and Stick
987B. High School - Become Human
implementation
976A. Minimum Binary Number
990A. Commentary Boxes
991A. If at first you don't succeed...
992A. Nastya and an Array
dynamic-programming
987C. Three displays