s-t Min-Cuts
l Recall: if G has min-cut c, then in G(r/c)
all cuts approximate their expected
values to within e.
l Applications:
Min-cut in
O*(mc) time [G]
Approximate/exact in
O*((m/c) c) =O*(m)
s-t min-cut of
value v in O*(mv)
Approximate in
O*(mv/c) time
l Trouble if c is small and v large.