Author: Tim Foden
Date: 11:10:10 02/22/05
Go up one level in this thread
On February 22, 2005 at 08:35:07, Andrew Wagner wrote:
>Hi all.
>I got sidetracked this morning by an interesting chess programming problem. It
>took me a couple hours, but I think I have a working algorithm -- haven't tested
>yet though. Anyway, I got to wondering if others would approach it the same way.
>So I thought I'd make a little competition of it. Post your code here, and I'll
>pick the program I like best and shower praise and adulation on its author. If
>people like this challenge, maybe I'll do one each month or something. Anyway,
>here's the one I did this morning:
>There are 64 x 63 = 4032 ways to put a black knight and white knoght both on a
>chess board. Write a program -- from scratch -- to generate FENs for each of
>these positions. The FENs should look something like: Nn6/8/8/8/8/8/8/8 w - - 0
>1.
>
>I think my code will wind up weighing in at around 60-70 lines of C. Can you do
>better?
Here's my attempt, although I did squidge the lines together a bit (20 lines) :)
#include <stdio.h>
int main( int, char** ) {
for( int i = 0; i < 64; i++ ) {
for( int j = 0; j < 64; j++ ) {
if( i == j ) continue;
for( int cnt = 0, k = 0; k < 64; k++ ) {
if( k && (k & 7) == 0 ) printf( "/" );
if( k == i || k == j ) {
if( cnt != 0 ) { printf( "%d", cnt ); cnt = 0; }
printf( k == i ? "N" : "n" );
} else {
cnt++;
if( (k & 7) == 7 ) { printf( "%d", cnt ); cnt = 0; }
}
}
printf( " - - 0 1\n" );
}
}
return 0;
}
Cheers, Tim.
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