I'm not having an easy time finding a hard dataset. The set I sent around earlier has no solution. When I corrected the transcription error (see the fourth set below) my program found a solution in short order.
- jeff parker Number of integers 27 {1, 6, 15} {1, 5, 10} {1, 3, 9} {1, 11, 18} {1, 9, 19} {1, 6, 10} {1, 9, 13} {1, 9, 14} {1, 10, 19} Try to solve Found a solution! .... Tics 19878, Calls 1851