formats/tsplib/cases/euc-2d-five/input.txt [tsplib]
  name: string "handmade-euc-2d-five"
  type: string "TSP"
  n: int 5
  edge_weight_type: string "EUC_2D"
  node_coord_type: string "TWOD_COORDS"
  node: int array 5
  x: float array 5
  y: float array 5