greg@uwvax.ARPA (Greg Johnson) (08/17/83)
Here's a cute problem I just saw in a magazine called APL Market News. For any positive integer N, compute the sum of 1 through N-1. The problem is to find a short APL expression to do this. Believe it or not, this can be done using three characters, one of which is 'N'! (That was a hint.) The solution follows (after some space to give you time to stop this so you can think about it.) | | | | | | | | | | | | v The solution: 2!N The problem and solution were submitted to the magazine by Kevin Farrell of Long Beach, Ca. Greg Johnson U. of Wisconsin - Madison ...seismo!uwvax!greg greg@uwisc