----------------  SOLUTION  -------------------

solution cost   : 241.974
number of trips : 4

trip 1, 24 customers, sequence : 54 55 41 56 57 39 68 40 38 37 69 67 66 65 64 62 63 59 58 61 60 34 32 31 
   weight    : 26772
   volume    : 24
   trip cost : 63.2939

trip 2, 24 customers, sequence : 20 29 30 21 22 28 27 42 44 43 46 53 45 52 48 47 50 70 51 49 25 24 26 23 
   weight    : 28236
   volume    : 24
   trip cost : 67.7046

trip 3, 6 customers, sequence : 35 18 11 19 14 36 
   weight    : 29852
   volume    : 6
   trip cost : 31.5053

trip 4, 17 customers, sequence : 33 1 15 2 13 17 16 12 71 6 10 5 3 8 4 7 9 
   weight    : 29980
   volume    : 17
   trip cost : 79.4698