  We give an explicit and computable description, in terms of the parabolic
quantum Bruhat graph, of the degree function defined for quantum
Lakshmibai-Seshadri paths, or equivalently, for "projected" (affine) level-zero
Lakshmibai-Seshadri paths. This, in turn, gives an explicit and computable
description of the global energy function on tensor products of
Kirillov-Reshetikhin crystals of one-column type, and also of (classically
restricted) one-dimensional sums.
