······@Uz.nthu.edu.tw (Zeno Zee-Yi Yang) writes:
> I am learning lisp now, common lisp.
> I try to write a lisp program to solve the
> cryptarithmetic problem:
>
> SEND
> +) MORE No two letters have the same value.
> ---------- The sums of the digits must be as shown in the problem.
> MONEY
>
> I don't know how to do.
> Could you give some suggestion to me?
Isn't it a pity that such old challenging problems are now degraded to
homework exercises?
References:
[1] A. Newell: Studies in Problem Solving - Subject 3 on the Crypt-
arithmetic Task DONALD+GERALD=ROBERT. Computer Science Dept.,
Carnegie Mellon University, 1967
[2] H. Stoyan: Programmiermethoden der kuenstlichen Intelligenz, Band 1.
Springer 1988
Bruno Haible
<······@ma2s2.mathematik.uni-karlsruhe.de>