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<lang c>#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#define N 100
#define D 6
typedef float flt;
typedef struct { flt p1, p2; int32_t hold; } strat;
strat ** prob;
#define P(op, sc, h) (prob[(op) * N + (sc)][h])
inline flt better(strat * p) {
return p->hold ? p->p1 : p->p2;
}
inline flt p_better(int op, int sc, int h) {
return better(&P(op, sc, h));
}
#define FOR(x, n) for (x = 0; x < n; x++)
void mkarray()
{
int i, j;
prob = malloc(sizeof(*prob) * N * N);
strat * pp = calloc(sizeof(*pp), N * N * (N + 1) / 2);
FOR(i, N) FOR(j, N)
prob[i * N + j] = pp, pp += N - j;
}
int step_array()
{
int converged = 1;
int i, j, k, r;
FOR(i, N) FOR(j, N) FOR(k, N - j) {
strat *p = &P(i, j, k);
flt p_current = p_better(i, j, k), chance1, chance2;
chance1 = 1 - p_better(j + k, i, 0); // if holding
chance2 = 1 - p_better(j, i, 0); // if rolling
for (r = 2; r <= D; r++)
chance2 += (j + k + r >= N) ? 1 : p_better(i, j, k + r);
chance2 /= D;
p->p1 = chance1;
p->p2 = chance2;
p->hold = k && chance1 > chance2;
if (converged && fabs(p_better(i, j, k) - p_current) > 1e-4)
converged = 0;
}
return converged;
}
void write_array()
{
int i, j, k;
FOR(i, N) {
FOR(j, N - i) {
printf("%2d %2d: ", i, j);
FOR(k, N) {
strat *p = &P(k,i,j);
putchar(p->hold ? '.' : 'R');
printf("(%.3f %.3f) ", p->p1, p->p2);
}
putchar('\n');
}
putchar('\n');
}
}
int main(void)
{
int i = 0;
mkarray();
while (!step_array())
fprintf(stderr, "iter %d\n", ++i);
write_array();
return 0;
}</lang>
<lang c>#include <ucontext.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
struct hist_t {
ucontext_t caller, callee;
void **in, *out;
int first;
struct hist_t *prev;
} *hist;
void backtrack() {
if (!hist) {
puts("backtracking exhausted");
abort();
}
setcontext(&hist->callee);
}
ucontext_t* hpush()
{
struct hist_t *h = malloc(sizeof(*h));
h->out = 0;
h->prev = hist;
hist = h;
return &hist->caller;
}
void hpop() {
struct hist_t *s = hist;
hist = hist->prev;
if (s->in) free(s->in);
free(s->callee.uc_stack.ss_sp);
free(s);
backtrack();
}
void yield(void *p)
{
hist->out = p;
swapcontext(&hist->callee, &hist->caller);
}
void hinit(void **in, void (*func)())
{
if (!hist->in) {
hist->in = in;
getcontext(&hist->callee);
hist->callee.uc_stack.ss_sp = malloc(4096);
hist->callee.uc_stack.ss_size = 4096;
hist->callee.uc_link = &hist->caller;
makecontext(&hist->callee, func, 0);
setcontext(&hist->callee);
}
}
#define amb (getcontext(hpush())+_amb)
void *_amb(int n, ...)
{
int i;
for (i = 0; hist->in[i]; i++)
yield(hist->in[i]);
hpop();
}
int i;
va_list ap;
void **buf = calloc((1 + n), sizeof(buf[0]));
va_start(ap, n);
for (i = 0; i < n; i++)
buf[i] = va_arg(ap, void*);
va_end(ap);
hinit(buf, iter);
return hist->out;
}
int main(void)
{
int join(char *a, char *b) {
return a[strlen(a) - 1] == b[0];
}
char *a = amb(3, "the", "that", "a"),
*b = amb(3, "frog", "elephant", "thing"),
*c = amb(3, "walked", "treaded", "grows"),
*d = amb(3, "slowly", "quickly", "deathly");
if (join(a, b) && join(b, c) && join(c, d))
printf("%s %s %s %s\n", a, b, c, d);
else
amb(0);
// should put a backtrack barrier here
int s[] = {1, 2, 3, 4};
int x = *(int*)amb(4, s, s+1, s+2, s+3);
int y = *(int*)amb(3, s, s+1, s+2);
int z = *(int*)amb(3, s, s+1, s+2);
//if (! (x > y && y < z && z < x && (x > 4))) // make "thing grows slowly"
if (! (x > y && y < z && z < x && !(x & 1)))
backtrack();
printf("%d %d %d\n", x, y, z);
return 0;
}</lang>
<lang lisp>(defmacro or= (x y) `(setf ,x (logior ,x ,y)))
(defmacro and= (x y) `(setf ,x (logand ,x ,y)))
(defconstant +N+ 1)
(defconstant +S+ 2)
(defconstant +W+ 4)
(defconstant +E+ 8)
(defconstant +V+ 16)
(defun show-maze (a)
(let ((h (1- (array-dimension a 0)))
(w (1- (array-dimension a 1)))
(g " │││─┘┐┤─└┌├─┴┬┼"))
(write-line "")
(loop for y from 0 to h do
(loop for x from 0 to w do
(format t "~c" (char g (logand (aref a y x) (lognot +V+)))))
(format t "~%"))))
(defun make-maze (w h)
(let* (xs (size (* (1- w) (1- h)))
(w2 (* 2 w)) (h2 (* 2 h))
(walls (make-array (list (1+ h2) (1+ w2))
:element-type 'integer :initial-element 0)))
(flet ((visit (y x) (or= (aref walls y x) +V+))
(rand-element (list r)
(loop for x in list with c = 1 with sel do
(if (zerop (random c)) (setf sel x))
(incf c r)
finally (return sel)))
(connect (c1 c2)
(let ((y1 (car c1)) (y2 (car c2))
(x1 (cdr c1)) (x2 (cdr c2)))
(if (= x1 x2)
(progn (or= (aref walls (min y1 y2) x1) +S+)
(or= (aref walls (1+ (min y1 y2)) x1) +S+)
(or= (aref walls (1+ (min y1 y2)) x1) +N+)
(or= (aref walls (max y1 y2) x1) +N+))
(progn (or= (aref walls y1 (min x1 x2)) +E+)
(or= (aref walls y1 (1+ (min x1 x2))) +E+)
(or= (aref walls y1 (1+ (min x1 x2))) +W+)
(or= (aref walls y1 (max x1 x2)) +W+)))))
(neighbor (cell)
(loop with cnt = 0 with next-cell
for (dy dx) in '((-2 0) (2 0) (0 2) (0 -2)) do
(let ((y (+ (car cell) dy)) (x (+ (cdr cell) dx)))
(if (and (array-in-bounds-p walls y x)
(not (logtest (aref walls y x) +V+))
(zerop (random (incf cnt))))
(setf next-cell (cons y x))))
finally (return next-cell))))
(setf xs (append
(loop for y from 0 to h
collect (cons (* 2 y) 0) collect (cons (* 2 y) w2)
do (let ((y2 (* 2 y)))
(visit y2 0) (visit y2 w2)
(when (< y2 h2)
(connect (cons y2 0) (cons (+ 2 y2) 0))
(connect (cons y2 w2) (cons (+ 2 y2) w2)))))
(loop for x from 0 to w
collect (cons 0 (* 2 x)) collect (cons h2 (* 2 x))
do (let ((x2 (* 2 x)))
(visit 0 x2) (visit h2 x2)
(when (< x2 w2)
(connect (cons 0 x2) (cons 0 (+ 2 x2)))
(connect (cons h2 x2) (cons h2 (+ 2 x2))))))))
(loop while xs do
;(let* ((c (elt xs (random (length xs)))) (c2 (neighbor c)))
(let* ((c (rand-element xs 100)) (c2 (neighbor c)))
;(let* ((c (first xs)) (c2 (neighbor c)))
(cond ((not c2) (setf xs (remove c xs :test #'equal)))
(t (connect c c2)
(visit (car c2) (cdr c2))
(decf size)
(push c2 xs)
))))
(show-maze walls))))
(print (make-maze 42 25))</lang>
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