test-1.js

const distances = [
  [1, 42, 33, 49],
  [11, 33, [[1, 13, 4], [4, 13, 3]], 91],
  [23, 42, 17, 19],
  [42, [[32, 11], [12, 9]], 41, 51, 3],
  [4, [[13, 3, 1, 4], [19]], 1],
  [99, 14, 59]
]

// Distances it’s an array of routes in the case of [a, b, [[c][d]]] 
// the traveller can choose between route c or d as he prefers shortest route or longest

// @todo: Find min and max distance possible for variable distances above.