I have recently smashed the html file for HW #1, which makes the page unreadable. I've sent a note to Rich ask him to fix it.
Please let me know if you need a copy of one or more of the problems or datasets in the meantime: the updated challenge and an impossible dataset for 1.5 are included below. - jeff parker (impossible) 12 {1, 4, 7, 10} {1, 4, 7, 10} {1, 4, 8, 10} New Problem set #9 (Hard!) 21 {1, 6, 12} {8, 10, 18} {8, 9, 13} {6, 13, 16} {12, 13, 14} { 8, 16, 17} {11, 15, 20}