ESSENCE' 1.0

letting r be 4
letting n be 5

letting demand be 
        [[0,1,0,1,0],
         [1,0,1,0,0],
         [0,1,0,0,1],
         [1,0,0,0,0],
         [0,0,1,0,0]]

letting capacity_nodes be [3,2,2,1]