Round 113 Div 2E Help

Правка en1, от chari407, 2018-05-14 16:16:25

Can someone explain the meaning of "symmetry" and how is that equality assumed in the comment for the editorial of Div2E Tetrahedron

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en1 Английский chari407 2018-05-14 16:16:25 260 Initial revision (published)