preflow demo (LEDA)... elapsed time: 0.385217 sec flow value: 6068 preflow demo (BOOST)... elapsed time: 0.869221 sec flow value: 6068 edmonds karp demo... elapsed time: 69.4014 sec flow value: 6068 edmonds karp demo (BOOST)... elapsed time: 188.151 sec flow value: 6068