In message <[EMAIL PROTECTED]
one.net>,
user who writes:
: >This general problem can be solved using RPN style algebra,
: >which is a postfix algebra.
:
: Then permutations of these 4 numbers are also needed here.
Enumerating the possible operator layouts:
- # # o # o # o
- # # o # # o o
- # # # o o # o
- # # # # o o o
where '#' represents a number and 'o' an operator.
A little combinatorics:
4! # positions for numbers
4 # number of operations
x 4 # number of operator layouts
---
384 # size of search space
Greg
