Add alt code to 1989/ovdluhe + update README.md

The alt code is based on the author's remarks. It allows one to more
easily redefine the macro they refer to (P) in a way that lets them try
it out without having to modify the code.

Updated .gitignore.

Format fixes in README.md.

1989/ovdluhe/.gitignore

@@ -1 +1,2 @@
 ovdluhe
+ovdluhe.alt

1989/ovdluhe/Makefile

@@ -115,8 +115,8 @@ OBJ= ${PROG}.o
 DATA=
 TARGET= ${PROG}
 #
-ALT_OBJ=
+ALT_OBJ= ${PROG}.alt.o
-ALT_TARGET=
+ALT_TARGET= ${PROG}.alt
 
 
 #################
@@ -138,6 +138,9 @@ ${PROG}: ${PROG}.c
 alt: data ${ALT_TARGET}
 	@${TRUE}
 
+${PROG}.alt: ${PROG}.alt.c
+	${CC} ${CFLAGS} $< -o $@ ${LIBS}
+
 # data files
 #
 data: ${DATA}

1989/ovdluhe/README.md

@@ -8,7 +8,9 @@
 
 ## To build:
 
+```sh
 make all
+```
 
 To get this to compile with a modern CPP, we had to replace `#D` with `#define`.
 
@@ -16,19 +18,34 @@ To get this to compile with a modern CPP, we had to replace `#D` with `#define`.
 
 Run the program this way:
 
+```sh
 ./ovdluhe < textfile
+```
 
 The program stops when it reaches the end of the template buffer 
 by chance or is killed.
 
 ## Try:
 
+```sh
 ./ovdluhe < ./ovdluhe.c
 ./ovdluhe < ./ovdluhe.c
 
 ./ovdluhe < README.md
 ./ovdluhe < README.md
+```
 
+### Alternate code:
+
+The author suggested that one varies the definition of `P` from 2 through 10. As
+it's a `#define` it's easy to set up which [Cody Boone
+Ferguson](/winners.html#Cody_Boone_Ferguson) did for us. To use try:
+
+```sh
+make CFLAGS="-DP=9" clobber alt
+```
+
+Use `ovdluhe.alt` as you would `ovdluhe`.
 
 ## Judges' remarks:
 
@@ -38,7 +55,7 @@ recommended.  You will get different output each time you run it.
 
 
 
-## Selected notes from the author:
+## Author's remarks:
 
 This program implements an "Eddington ape" - it generates
 random text from a supplied template.  The template text file

1989/ovdluhe/ovdluhe.alt.c

@@ -0,0 +1,26 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+typedef char ape;
+#define EA register
+#define EP unsigned
+#define A 1
+#define AP (A<<A)
+#ifndef P
+#define P (A<<AP)
+#endif
+#define AE ((P<<P)<<A)
+#define PE (((A<<P)<<P)<<P)
+#define E ((EP)A>>A)
+#define APE {EA EP ape,ea=AE;while(ea--) e[ea]=E;}
+PA();
+;ape a[PE+A],ap,*ae,p[P+A],e[AE];
+main(){ape pe,*ep=a;srand((EP)time((long)E));
+while(((*(ep++)=getchar())!=-A)&&((ep-a)<PE));
+*(ae= --ep)=E;for(ap=E;ap<=P;){APE;if(pe=PA())
+{putchar(pe);if(ap<P){p[ap]=pe;ap++;}else{
+ep=p+A;while(*ep) *(ep-A)= *(ep++); *(ep-A)=pe;}}else break;}}
+PA(){EA ape pe,*ep=a,pa,Ap=E;for(ep=a;ep<ae-P;ep++)
+if(!strncmp(ep,p,ap)){e[*(ep+ap)]++;Ap++;}if(!Ap)return(Ap);
+pa=rand()%Ap+A;pe=~E,Ap=!Ap;while((Ap+=e[++pe])<pa);return(pe);}