  The Chow group of zero cycles in the moduli space of stable pointed curves of
genus zero is isomorphic to the integer additive group. Let $M$ be monomial in
this Chow group. If no two factors of $M$ fulfill a particular quadratic
relation, then the monomial can be represented equivalently by a specific tree;
otherwise, $M$ is mapped to zero under the stated isomorphism. Starting from
this tree representation, we introduce a graphical algorithm for computing the
corresponding integer for $M$ under the aforementioned isomorphism. The
algorithm is linear with respect to the size of the tree.
