On polynomial solvability of some problems of a vector subset choice in a Euclidean space of fixed dimension

The problems under study are connected with the choice of a vector subset from a given finite set of vectors in the Euclidean space ℝk. The sum norm and averaged square of the sumnorm are considered as the target functions (to be maximized). The optimal combinatorial algorithms with time complexity O(k2n2k) are developed for these problems. Thus, the polynomial solvability of these problems is proved for k fixed.