beginner_boy's blog

By beginner_boy, history, 7 months ago, In English,

Hello everyone, i am stuck with the problem 1279 — Graph Coloring which can be solved computing the value $$$K ^ {(n - r)}$$$, where $$$r$$$ is the rank of matrix $$$a$$$, according with this blog, but i cant understand how it works, specifically what's the sense of the matrix $$$a$$$ builded in this code bellow:

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