《Practical Set Reconciliation》
Yaron Minsky Cornell University https://blog.janestreet.com/author/yminsky/
Ari Trachtenberg Boston University
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.456.7200&rep=rep1&type=pdf
def set_reconcile(src_seq, dst_seq):
"Return required operations to mutate src_seq into dst_seq"
src_set= set(src_seq) # no-op if already of type set
dst_set= set(dst_seq) # ditto
for item in src_set - dst_set:
yield 'delete', item
for item in dst_set - src_set:
yield 'create', item
for i in set_reconcile([1,2,3,4], [2,3,4,5]):
print i
$ python set_reconcile.py
('delete', 1)
('create', 5)
