2 * towers.c: the puzzle also known as 'Skyscrapers'.
4 * Possible future work:
6 * - Relax the upper bound on grid size at 9?
7 * + I'd need TOCHAR and FROMCHAR macros a bit like group's, to
8 * be used wherever this code has +'0' or -'0'
9 * + the pencil marks in the drawstate would need a separate
11 * + the clues outside the grid would have to cope with being
12 * multi-digit, meaning in particular that the text formatting
13 * would become more unpleasant
14 * + most importantly, though, the solver just isn't fast
15 * enough. Even at size 9 it can't really do the solver_hard
16 * factorial-time enumeration at a sensible rate. Easy puzzles
17 * higher than that would be possible, but more latin-squarey
18 * than skyscrapery, as it were.
21 * + Allow the user to mark a clue as 'spent' in some way once
22 * it's no longer interesting (typically because no
23 * arrangement of the remaining possibilities _can_ violate
38 * Difficulty levels. I do some macro ickery here to ensure that my
39 * enum and the various forms of my name list always match up.
42 A(EASY,Easy,solver_easy,e) \
43 A(HARD,Hard,solver_hard,h) \
44 A(EXTREME,Extreme,NULL,x) \
45 A(UNREASONABLE,Unreasonable,NULL,u)
46 #define ENUM(upper,title,func,lower) DIFF_ ## upper,
47 #define TITLE(upper,title,func,lower) #title,
48 #define ENCODE(upper,title,func,lower) #lower
49 #define CONFIG(upper,title,func,lower) ":" #title
50 enum { DIFFLIST(ENUM
) DIFFCOUNT
};
51 static char const *const towers_diffnames
[] = { DIFFLIST(TITLE
) };
52 static char const towers_diffchars
[] = DIFFLIST(ENCODE
);
53 #define DIFFCONFIG DIFFLIST(CONFIG)
73 * An array of 4w integers, of which:
74 * - the first w run across the top
75 * - the next w across the bottom
76 * - the third w down the left
77 * - the last w down the right.
82 * An array of w*w digits.
88 * Macros to compute clue indices and coordinates.
90 #define STARTSTEP(start, step, index, w) do { \
92 start = index, step = w; \
93 else if (index < 2*w) \
94 start = (w-1)*w+(index-w), step = -w; \
95 else if (index < 3*w) \
96 start = w*(index-2*w), step = 1; \
98 start = w*(index-3*w)+(w-1), step = -1; \
100 #define CSTARTSTEP(start, step, index, w) \
101 STARTSTEP(start, step, (((index)+2*w)%(4*w)), w)
102 #define CLUEPOS(x, y, index, w) do { \
105 else if (index < 2*w) \
106 x = index-w, y = w; \
107 else if (index < 3*w) \
108 x = -1, y = index-2*w; \
110 x = w, y = index-3*w; \
113 #ifdef STANDALONE_SOLVER
114 static const char *const cluepos
[] = {
115 "above column", "below column", "left of row", "right of row"
123 int *pencil
; /* bitmaps using bits 1<<1..1<<n */
124 int completed
, cheated
;
127 static game_params
*default_params(void)
129 game_params
*ret
= snew(game_params
);
132 ret
->diff
= DIFF_EASY
;
137 const static struct game_params towers_presets
[] = {
144 { 6, DIFF_UNREASONABLE
},
147 static int game_fetch_preset(int i
, char **name
, game_params
**params
)
152 if (i
< 0 || i
>= lenof(towers_presets
))
155 ret
= snew(game_params
);
156 *ret
= towers_presets
[i
]; /* structure copy */
158 sprintf(buf
, "%dx%d %s", ret
->w
, ret
->w
, towers_diffnames
[ret
->diff
]);
165 static void free_params(game_params
*params
)
170 static game_params
*dup_params(game_params
*params
)
172 game_params
*ret
= snew(game_params
);
173 *ret
= *params
; /* structure copy */
177 static void decode_params(game_params
*params
, char const *string
)
179 char const *p
= string
;
182 while (*p
&& isdigit((unsigned char)*p
)) p
++;
187 params
->diff
= DIFFCOUNT
+1; /* ...which is invalid */
189 for (i
= 0; i
< DIFFCOUNT
; i
++) {
190 if (*p
== towers_diffchars
[i
])
198 static char *encode_params(game_params
*params
, int full
)
202 sprintf(ret
, "%d", params
->w
);
204 sprintf(ret
+ strlen(ret
), "d%c", towers_diffchars
[params
->diff
]);
209 static config_item
*game_configure(game_params
*params
)
214 ret
= snewn(3, config_item
);
216 ret
[0].name
= "Grid size";
217 ret
[0].type
= C_STRING
;
218 sprintf(buf
, "%d", params
->w
);
219 ret
[0].sval
= dupstr(buf
);
222 ret
[1].name
= "Difficulty";
223 ret
[1].type
= C_CHOICES
;
224 ret
[1].sval
= DIFFCONFIG
;
225 ret
[1].ival
= params
->diff
;
235 static game_params
*custom_params(config_item
*cfg
)
237 game_params
*ret
= snew(game_params
);
239 ret
->w
= atoi(cfg
[0].sval
);
240 ret
->diff
= cfg
[1].ival
;
245 static char *validate_params(game_params
*params
, int full
)
247 if (params
->w
< 3 || params
->w
> 9)
248 return "Grid size must be between 3 and 9";
249 if (params
->diff
>= DIFFCOUNT
)
250 return "Unknown difficulty rating";
254 /* ----------------------------------------------------------------------
266 static int solver_easy(struct latin_solver
*solver
, void *vctx
)
268 struct solver_ctx
*ctx
= (struct solver_ctx
*)vctx
;
270 int c
, i
, j
, n
, m
, furthest
;
271 int start
, step
, cstart
, cstep
, clue
, pos
, cpos
;
273 #ifdef STANDALONE_SOLVER
280 * One-off loop to help get started: when a pair of facing
281 * clues sum to w+1, it must mean that the row consists of
282 * two increasing sequences back to back, so we can
283 * immediately place the highest digit by knowing the
284 * lengths of those two sequences.
286 for (c
= 0; c
< 3*w
; c
= (c
== w
-1 ?
2*w
: c
+1)) {
289 if (ctx
->clues
[c
] && ctx
->clues
[c2
] &&
290 ctx
->clues
[c
] + ctx
->clues
[c2
] == w
+1) {
291 STARTSTEP(start
, step
, c
, w
);
292 CSTARTSTEP(cstart
, cstep
, c
, w
);
293 pos
= start
+ (ctx
->clues
[c
]-1)*step
;
294 cpos
= cstart
+ (ctx
->clues
[c
]-1)*cstep
;
295 if (solver
->cube
[cpos
*w
+w
-1]) {
296 #ifdef STANDALONE_SOLVER
297 if (solver_show_working
) {
298 printf("%*sfacing clues on %s %d are maximal:\n",
299 solver_recurse_depth
*4, "",
300 c
>=2*w ?
"row" : "column", c
% w
+ 1);
301 printf("%*s placing %d at (%d,%d)\n",
302 solver_recurse_depth
*4, "",
303 w
, pos
%w
+1, pos
/w
+1);
306 latin_solver_place(solver
, pos
%w
, pos
/w
, w
);
319 * Go over every clue doing reasonably simple heuristic
322 for (c
= 0; c
< 4*w
; c
++) {
323 clue
= ctx
->clues
[c
];
326 STARTSTEP(start
, step
, c
, w
);
327 CSTARTSTEP(cstart
, cstep
, c
, w
);
329 /* Find the location of each number in the row. */
330 for (i
= 0; i
< w
; i
++)
331 ctx
->dscratch
[i
] = w
;
332 for (i
= 0; i
< w
; i
++)
333 if (solver
->grid
[start
+i
*step
])
334 ctx
->dscratch
[solver
->grid
[start
+i
*step
]-1] = i
;
338 for (i
= w
; i
>= 1; i
--) {
339 if (ctx
->dscratch
[i
-1] == w
) {
341 } else if (ctx
->dscratch
[i
-1] < furthest
) {
342 furthest
= ctx
->dscratch
[i
-1];
347 if (clue
== n
+1 && furthest
> 1) {
348 #ifdef STANDALONE_SOLVER
349 if (solver_show_working
)
350 sprintf(prefix
, "%*sclue %s %d is nearly filled:\n",
351 solver_recurse_depth
*4, "",
352 cluepos
[c
/w
], c
%w
+1);
354 prefix
[0] = '\0'; /* placate optimiser */
357 * We can already see an increasing sequence of the very
358 * highest numbers, of length one less than that
359 * specified in the clue. All of those numbers _must_ be
360 * part of the clue sequence, so the number right next
361 * to the clue must be the final one - i.e. it must be
362 * bigger than any of the numbers between it and m. This
363 * allows us to rule out small numbers in that square.
365 * (This is a generalisation of the obvious deduction
366 * that when you see a clue saying 1, it must be right
367 * next to the largest possible number; and similarly,
368 * when you see a clue saying 2 opposite that, it must
369 * be right next to the second-largest.)
371 j
= furthest
-1; /* number of small numbers we can rule out */
372 for (i
= 1; i
<= w
&& j
> 0; i
++) {
373 if (ctx
->dscratch
[i
-1] < w
&& ctx
->dscratch
[i
-1] >= furthest
)
374 continue; /* skip this number, it's elsewhere */
376 if (solver
->cube
[cstart
*w
+i
-1]) {
377 #ifdef STANDALONE_SOLVER
378 if (solver_show_working
) {
379 printf("%s%*s ruling out %d at (%d,%d)\n",
380 prefix
, solver_recurse_depth
*4, "",
381 i
, start
%w
+1, start
/w
+1);
385 solver
->cube
[cstart
*w
+i
-1] = 0;
394 #ifdef STANDALONE_SOLVER
395 if (solver_show_working
)
396 sprintf(prefix
, "%*slower bounds for clue %s %d:\n",
397 solver_recurse_depth
*4, "",
398 cluepos
[c
/w
], c
%w
+1);
400 prefix
[0] = '\0'; /* placate optimiser */
404 for (n
= w
; n
> 0; n
--) {
406 * The largest number cannot occur in the first (clue-1)
407 * squares of the row, or else there wouldn't be space
408 * for a sufficiently long increasing sequence which it
409 * terminated. The second-largest number (not counting
410 * any that are known to be on the far side of a larger
411 * number and hence excluded from this sequence) cannot
412 * occur in the first (clue-2) squares, similarly, and
416 if (ctx
->dscratch
[n
-1] < w
) {
417 for (m
= n
+1; m
< w
; m
++)
418 if (ctx
->dscratch
[m
] < ctx
->dscratch
[n
-1])
421 continue; /* this number doesn't count */
424 for (j
= 0; j
< clue
- i
- 1; j
++)
425 if (solver
->cube
[(cstart
+ j
*cstep
)*w
+n
-1]) {
426 #ifdef STANDALONE_SOLVER
427 if (solver_show_working
) {
428 int pos
= start
+j
*step
;
429 printf("%s%*s ruling out %d at (%d,%d)\n",
430 prefix
, solver_recurse_depth
*4, "",
431 n
, pos
%w
+1, pos
/w
+1);
435 solver
->cube
[(cstart
+ j
*cstep
)*w
+n
-1] = 0;
448 static int solver_hard(struct latin_solver
*solver
, void *vctx
)
450 struct solver_ctx
*ctx
= (struct solver_ctx
*)vctx
;
452 int c
, i
, j
, n
, best
, clue
, start
, step
, ret
;
454 #ifdef STANDALONE_SOLVER
459 * Go over every clue analysing all possibilities.
461 for (c
= 0; c
< 4*w
; c
++) {
462 clue
= ctx
->clues
[c
];
465 CSTARTSTEP(start
, step
, c
, w
);
467 for (i
= 0; i
< w
; i
++)
468 ctx
->iscratch
[i
] = 0;
471 * Instead of a tedious physical recursion, I iterate in the
472 * scratch array through all possibilities. At any given
473 * moment, i indexes the element of the box that will next
477 ctx
->dscratch
[i
] = 0;
484 * Find the next valid value for cell i.
486 int limit
= (n
== clue ? best
: w
);
487 int pos
= start
+ step
* i
;
488 for (j
= ctx
->dscratch
[i
] + 1; j
<= limit
; j
++) {
489 if (bitmap
& (1L << j
))
490 continue; /* used this one already */
491 if (!solver
->cube
[pos
*w
+j
-1])
492 continue; /* ruled out already */
499 /* No valid values left; drop back. */
502 break; /* overall iteration is finished */
503 bitmap
&= ~(1L << ctx
->dscratch
[i
]);
504 if (ctx
->dscratch
[i
] == best
) {
507 for (j
= 0; j
< i
; j
++)
508 if (best
< ctx
->dscratch
[j
])
509 best
= ctx
->dscratch
[j
];
512 /* Got a valid value; store it and move on. */
514 ctx
->dscratch
[i
++] = j
;
519 ctx
->dscratch
[i
] = 0;
523 for (j
= 0; j
< w
; j
++)
524 ctx
->iscratch
[j
] |= 1L << ctx
->dscratch
[j
];
527 bitmap
&= ~(1L << ctx
->dscratch
[i
]);
528 if (ctx
->dscratch
[i
] == best
) {
531 for (j
= 0; j
< i
; j
++)
532 if (best
< ctx
->dscratch
[j
])
533 best
= ctx
->dscratch
[j
];
538 #ifdef STANDALONE_SOLVER
539 if (solver_show_working
)
540 sprintf(prefix
, "%*sexhaustive analysis of clue %s %d:\n",
541 solver_recurse_depth
*4, "",
542 cluepos
[c
/w
], c
%w
+1);
544 prefix
[0] = '\0'; /* placate optimiser */
549 for (i
= 0; i
< w
; i
++) {
550 int pos
= start
+ step
* i
;
551 for (j
= 1; j
<= w
; j
++) {
552 if (solver
->cube
[pos
*w
+j
-1] &&
553 !(ctx
->iscratch
[i
] & (1L << j
))) {
554 #ifdef STANDALONE_SOLVER
555 if (solver_show_working
) {
556 printf("%s%*s ruling out %d at (%d,%d)\n",
557 prefix
, solver_recurse_depth
*4, "",
558 j
, pos
/w
+1, pos
%w
+1);
562 solver
->cube
[pos
*w
+j
-1] = 0;
568 * Once we find one clue we can do something with in
569 * this way, revert to trying easier deductions, so as
570 * not to generate solver diagnostics that make the
571 * problem look harder than it is.
581 #define SOLVER(upper,title,func,lower) func,
582 static usersolver_t
const towers_solvers
[] = { DIFFLIST(SOLVER
) };
584 static int solver(int w
, int *clues
, digit
*soln
, int maxdiff
)
587 struct solver_ctx ctx
;
593 ctx
.iscratch
= snewn(w
, long);
594 ctx
.dscratch
= snewn(w
+1, int);
596 ret
= latin_solver(soln
, w
, maxdiff
,
597 DIFF_EASY
, DIFF_HARD
, DIFF_EXTREME
,
598 DIFF_EXTREME
, DIFF_UNREASONABLE
,
599 towers_solvers
, &ctx
, NULL
, NULL
);
607 /* ----------------------------------------------------------------------
611 static char *new_game_desc(game_params
*params
, random_state
*rs
,
612 char **aux
, int interactive
)
614 int w
= params
->w
, a
= w
*w
;
615 digit
*grid
, *soln
, *soln2
;
618 int diff
= params
->diff
;
622 * Difficulty exceptions: some combinations of size and
623 * difficulty cannot be satisfied, because all puzzles of at
624 * most that difficulty are actually even easier.
626 * Remember to re-test this whenever a change is made to the
629 * I tested it using the following shell command:
633 echo -n "./towers --generate 1 ${i}d${d}: "
634 perl -e 'alarm 30; exec @ARGV' ./towers --generate 1 ${i}d${d} >/dev/null \
639 * Of course, it's better to do that after taking the exceptions
640 * _out_, so as to detect exceptions that should be removed as
641 * well as those which should be added.
643 if (diff
> DIFF_HARD
&& w
<= 3)
647 clues
= snewn(4*w
, int);
648 soln
= snewn(a
, digit
);
649 soln2
= snewn(a
, digit
);
650 order
= snewn(max(4*w
,a
), int);
654 * Construct a latin square to be the solution.
657 grid
= latin_generate(w
, rs
);
662 for (i
= 0; i
< 4*w
; i
++) {
663 int start
, step
, j
, k
, best
;
664 STARTSTEP(start
, step
, i
, w
);
666 for (j
= 0; j
< w
; j
++) {
667 if (grid
[start
+j
*step
] > best
) {
668 best
= grid
[start
+j
*step
];
676 * Remove the grid numbers and then the clues, one by one,
677 * for as long as the game remains soluble at the given
680 memcpy(soln
, grid
, a
);
682 if (diff
== DIFF_EASY
&& w
<= 5) {
684 * Special case: for Easy-mode grids that are small
685 * enough, it's nice to be able to find completely empty
689 ret
= solver(w
, clues
, soln2
, diff
);
694 for (i
= 0; i
< a
; i
++)
696 shuffle(order
, a
, sizeof(*order
), rs
);
697 for (i
= 0; i
< a
; i
++) {
700 memcpy(soln2
, grid
, a
);
702 ret
= solver(w
, clues
, soln2
, diff
);
707 if (diff
> DIFF_EASY
) { /* leave all clues on Easy mode */
708 for (i
= 0; i
< 4*w
; i
++)
710 shuffle(order
, 4*w
, sizeof(*order
), rs
);
711 for (i
= 0; i
< 4*w
; i
++) {
715 memcpy(soln2
, grid
, a
);
717 ret
= solver(w
, clues
, soln2
, diff
);
724 * See if the game can be solved at the specified difficulty
725 * level, but not at the one below.
727 memcpy(soln2
, grid
, a
);
728 ret
= solver(w
, clues
, soln2
, diff
);
730 continue; /* go round again */
733 * We've got a usable puzzle!
739 * Encode the puzzle description.
741 desc
= snewn(40*a
, char);
743 for (i
= 0; i
< 4*w
; i
++) {
744 p
+= sprintf(p
, "%s%.0d", i?
"/":"", clues
[i
]);
746 for (i
= 0; i
< a
; i
++)
754 for (i
= 0; i
<= a
; i
++) {
755 int n
= (i
< a ? grid
[i
] : -1);
762 int thisrun
= min(run
, 26);
763 *p
++ = thisrun
- 1 + 'a';
768 * If there's a number in the very top left or
769 * bottom right, there's no point putting an
770 * unnecessary _ before or after it.
776 p
+= sprintf(p
, "%d", n
);
782 desc
= sresize(desc
, p
- desc
, char);
785 * Encode the solution.
787 *aux
= snewn(a
+2, char);
789 for (i
= 0; i
< a
; i
++)
790 (*aux
)[i
+1] = '0' + soln
[i
];
802 /* ----------------------------------------------------------------------
806 static char *validate_desc(game_params
*params
, char *desc
)
808 int w
= params
->w
, a
= w
*w
;
809 const char *p
= desc
;
813 * Verify that the right number of clues are given, and that
816 for (i
= 0; i
< 4*w
; i
++) {
818 return "Too few clues for grid size";
822 return "Expected commas between clues";
826 if (isdigit((unsigned char)*p
)) {
828 while (*p
&& isdigit((unsigned char)*p
)) p
++;
830 if (clue
<= 0 || clue
> w
)
831 return "Clue number out of range";
835 return "Too many clues for grid size";
839 * Verify that the right amount of grid data is given, and
840 * that any grid elements provided are in range.
847 if (c
>= 'a' && c
<= 'z') {
848 squares
+= c
- 'a' + 1;
849 } else if (c
== '_') {
851 } else if (c
> '0' && c
<= '9') {
853 if (val
< 1 || val
> w
)
854 return "Out-of-range number in grid description";
856 while (*p
&& isdigit((unsigned char)*p
)) p
++;
858 return "Invalid character in game description";
862 return "Not enough data to fill grid";
865 return "Too much data to fit in grid";
871 static game_state
*new_game(midend
*me
, game_params
*params
, char *desc
)
873 int w
= params
->w
, a
= w
*w
;
874 game_state
*state
= snew(game_state
);
875 const char *p
= desc
;
878 state
->par
= *params
; /* structure copy */
879 state
->clues
= snew(struct clues
);
880 state
->clues
->refcount
= 1;
882 state
->clues
->clues
= snewn(4*w
, int);
883 state
->clues
->immutable
= snewn(a
, digit
);
884 state
->grid
= snewn(a
, digit
);
885 state
->pencil
= snewn(a
, int);
887 for (i
= 0; i
< a
; i
++) {
889 state
->pencil
[i
] = 0;
892 memset(state
->clues
->immutable
, 0, a
);
894 for (i
= 0; i
< 4*w
; i
++) {
899 if (*p
&& isdigit((unsigned char)*p
)) {
900 state
->clues
->clues
[i
] = atoi(p
);
901 while (*p
&& isdigit((unsigned char)*p
)) p
++;
903 state
->clues
->clues
[i
] = 0;
911 if (c
>= 'a' && c
<= 'z') {
913 } else if (c
== '_') {
915 } else if (c
> '0' && c
<= '9') {
917 assert(val
>= 1 && val
<= w
);
919 state
->grid
[pos
] = state
->clues
->immutable
[pos
] = val
;
921 while (*p
&& isdigit((unsigned char)*p
)) p
++;
923 assert(!"Corrupt game description");
929 state
->completed
= state
->cheated
= FALSE
;
934 static game_state
*dup_game(game_state
*state
)
936 int w
= state
->par
.w
, a
= w
*w
;
937 game_state
*ret
= snew(game_state
);
939 ret
->par
= state
->par
; /* structure copy */
941 ret
->clues
= state
->clues
;
942 ret
->clues
->refcount
++;
944 ret
->grid
= snewn(a
, digit
);
945 ret
->pencil
= snewn(a
, int);
946 memcpy(ret
->grid
, state
->grid
, a
*sizeof(digit
));
947 memcpy(ret
->pencil
, state
->pencil
, a
*sizeof(int));
949 ret
->completed
= state
->completed
;
950 ret
->cheated
= state
->cheated
;
955 static void free_game(game_state
*state
)
958 sfree(state
->pencil
);
959 if (--state
->clues
->refcount
<= 0) {
960 sfree(state
->clues
->immutable
);
961 sfree(state
->clues
->clues
);
967 static char *solve_game(game_state
*state
, game_state
*currstate
,
968 char *aux
, char **error
)
970 int w
= state
->par
.w
, a
= w
*w
;
978 soln
= snewn(a
, digit
);
979 memcpy(soln
, state
->clues
->immutable
, a
);
981 ret
= solver(w
, state
->clues
->clues
, soln
, DIFFCOUNT
-1);
983 if (ret
== diff_impossible
) {
984 *error
= "No solution exists for this puzzle";
986 } else if (ret
== diff_ambiguous
) {
987 *error
= "Multiple solutions exist for this puzzle";
990 out
= snewn(a
+2, char);
992 for (i
= 0; i
< a
; i
++)
993 out
[i
+1] = '0' + soln
[i
];
1001 static int game_can_format_as_text_now(game_params
*params
)
1006 static char *game_text_format(game_state
*state
)
1008 int w
= state
->par
.w
/* , a = w*w */;
1016 * - a top clue row, consisting of three spaces, then w clue
1017 * digits with spaces between (total 2*w+3 chars including
1019 * - a blank line (one newline)
1020 * - w main rows, consisting of a left clue digit, two spaces,
1021 * w grid digits with spaces between, two spaces and a right
1022 * clue digit (total 2*w+6 chars each including newline)
1023 * - a blank line (one newline)
1024 * - a bottom clue row (same as top clue row)
1025 * - terminating NUL.
1027 * Total size is therefore 2*(2*w+3) + 2 + w*(2*w+6) + 1
1030 total
= 2*w
*w
+ 10*w
+ 9;
1031 ret
= snewn(total
, char);
1035 *p
++ = ' '; *p
++ = ' ';
1036 for (x
= 0; x
< w
; x
++) {
1038 *p
++ = (state
->clues
->clues
[x
] ?
'0' + state
->clues
->clues
[x
] : ' ');
1046 for (y
= 0; y
< w
; y
++) {
1047 *p
++ = (state
->clues
->clues
[y
+2*w
] ?
'0' + state
->clues
->clues
[y
+2*w
] :
1050 for (x
= 0; x
< w
; x
++) {
1052 *p
++ = (state
->grid
[y
*w
+x
] ?
'0' + state
->grid
[y
*w
+x
] : ' ');
1054 *p
++ = ' '; *p
++ = ' ';
1055 *p
++ = (state
->clues
->clues
[y
+3*w
] ?
'0' + state
->clues
->clues
[y
+3*w
] :
1063 /* Bottom clue row. */
1064 *p
++ = ' '; *p
++ = ' ';
1065 for (x
= 0; x
< w
; x
++) {
1067 *p
++ = (state
->clues
->clues
[x
+w
] ?
'0' + state
->clues
->clues
[x
+w
] :
1073 assert(p
== ret
+ total
);
1080 * These are the coordinates of the currently highlighted
1081 * square on the grid, if hshow = 1.
1085 * This indicates whether the current highlight is a
1086 * pencil-mark one or a real one.
1090 * This indicates whether or not we're showing the highlight
1091 * (used to be hx = hy = -1); important so that when we're
1092 * using the cursor keys it doesn't keep coming back at a
1093 * fixed position. When hshow = 1, pressing a valid number
1094 * or letter key or Space will enter that number or letter in the grid.
1098 * This indicates whether we're using the highlight as a cursor;
1099 * it means that it doesn't vanish on a keypress, and that it is
1100 * allowed on immutable squares.
1105 static game_ui
*new_ui(game_state
*state
)
1107 game_ui
*ui
= snew(game_ui
);
1109 ui
->hx
= ui
->hy
= 0;
1110 ui
->hpencil
= ui
->hshow
= ui
->hcursor
= 0;
1115 static void free_ui(game_ui
*ui
)
1120 static char *encode_ui(game_ui
*ui
)
1125 static void decode_ui(game_ui
*ui
, char *encoding
)
1129 static void game_changed_state(game_ui
*ui
, game_state
*oldstate
,
1130 game_state
*newstate
)
1132 int w
= newstate
->par
.w
;
1134 * We prevent pencil-mode highlighting of a filled square, unless
1135 * we're using the cursor keys. So if the user has just filled in
1136 * a square which we had a pencil-mode highlight in (by Undo, or
1137 * by Redo, or by Solve), then we cancel the highlight.
1139 if (ui
->hshow
&& ui
->hpencil
&& !ui
->hcursor
&&
1140 newstate
->grid
[ui
->hy
* w
+ ui
->hx
] != 0) {
1145 #define PREFERRED_TILESIZE 48
1146 #define TILESIZE (ds->tilesize)
1147 #define BORDER (TILESIZE * 9 / 8)
1148 #define COORD(x) ((x)*TILESIZE + BORDER)
1149 #define FROMCOORD(x) (((x)+(TILESIZE-BORDER)) / TILESIZE - 1)
1151 #define FLASH_TIME 0.4F
1153 #define DF_PENCIL_SHIFT 16
1154 #define DF_ERROR 0x8000
1155 #define DF_HIGHLIGHT 0x4000
1156 #define DF_HIGHLIGHT_PENCIL 0x2000
1157 #define DF_IMMUTABLE 0x1000
1158 #define DF_PLAYAREA 0x0800
1159 #define DF_DIGIT_MASK 0x00FF
1161 struct game_drawstate
{
1168 static int check_errors(game_state
*state
, int *errors
)
1170 int w
= state
->par
.w
/*, a = w*w */;
1171 int W
= w
+2, A
= W
*W
; /* the errors array is (w+2) square */
1172 int *clues
= state
->clues
->clues
;
1173 digit
*grid
= state
->grid
;
1174 int i
, x
, y
, errs
= FALSE
;
1177 assert(w
< lenof(tmp
));
1180 for (i
= 0; i
< A
; i
++)
1183 for (y
= 0; y
< w
; y
++) {
1184 unsigned long mask
= 0, errmask
= 0;
1185 for (x
= 0; x
< w
; x
++) {
1186 unsigned long bit
= 1UL << grid
[y
*w
+x
];
1187 errmask
|= (mask
& bit
);
1191 if (mask
!= (1L << (w
+1)) - (1L << 1)) {
1195 for (x
= 0; x
< w
; x
++)
1196 if (errmask
& (1UL << grid
[y
*w
+x
]))
1197 errors
[(y
+1)*W
+(x
+1)] = TRUE
;
1202 for (x
= 0; x
< w
; x
++) {
1203 unsigned long mask
= 0, errmask
= 0;
1204 for (y
= 0; y
< w
; y
++) {
1205 unsigned long bit
= 1UL << grid
[y
*w
+x
];
1206 errmask
|= (mask
& bit
);
1210 if (mask
!= (1 << (w
+1)) - (1 << 1)) {
1214 for (y
= 0; y
< w
; y
++)
1215 if (errmask
& (1UL << grid
[y
*w
+x
]))
1216 errors
[(y
+1)*W
+(x
+1)] = TRUE
;
1221 for (i
= 0; i
< 4*w
; i
++) {
1222 int start
, step
, j
, k
, n
, best
;
1223 STARTSTEP(start
, step
, i
, w
);
1230 for (j
= 0; j
< w
; j
++) {
1231 int number
= grid
[start
+j
*step
];
1233 break; /* can't tell what happens next */
1234 if (number
> best
) {
1240 if (n
> clues
[i
] || (j
== w
&& n
< clues
[i
])) {
1243 CLUEPOS(x
, y
, i
, w
);
1244 errors
[(y
+1)*W
+(x
+1)] = TRUE
;
1253 static char *interpret_move(game_state
*state
, game_ui
*ui
, game_drawstate
*ds
,
1254 int x
, int y
, int button
)
1256 int w
= state
->par
.w
;
1260 button
&= ~MOD_MASK
;
1265 if (tx
>= 0 && tx
< w
&& ty
>= 0 && ty
< w
) {
1266 if (button
== LEFT_BUTTON
) {
1267 if (tx
== ui
->hx
&& ty
== ui
->hy
&&
1268 ui
->hshow
&& ui
->hpencil
== 0) {
1273 ui
->hshow
= !state
->clues
->immutable
[ty
*w
+tx
];
1277 return ""; /* UI activity occurred */
1279 if (button
== RIGHT_BUTTON
) {
1281 * Pencil-mode highlighting for non filled squares.
1283 if (state
->grid
[ty
*w
+tx
] == 0) {
1284 if (tx
== ui
->hx
&& ty
== ui
->hy
&&
1285 ui
->hshow
&& ui
->hpencil
) {
1297 return ""; /* UI activity occurred */
1300 if (IS_CURSOR_MOVE(button
)) {
1301 move_cursor(button
, &ui
->hx
, &ui
->hy
, w
, w
, 0);
1302 ui
->hshow
= ui
->hcursor
= 1;
1306 (button
== CURSOR_SELECT
)) {
1307 ui
->hpencil
= 1 - ui
->hpencil
;
1313 ((button
>= '0' && button
<= '9' && button
- '0' <= w
) ||
1314 button
== CURSOR_SELECT2
|| button
== '\b')) {
1315 int n
= button
- '0';
1316 if (button
== CURSOR_SELECT2
|| button
== '\b')
1320 * Can't make pencil marks in a filled square. This can only
1321 * become highlighted if we're using cursor keys.
1323 if (ui
->hpencil
&& state
->grid
[ui
->hy
*w
+ui
->hx
])
1327 * Can't do anything to an immutable square.
1329 if (state
->clues
->immutable
[ui
->hy
*w
+ui
->hx
])
1332 sprintf(buf
, "%c%d,%d,%d",
1333 (char)(ui
->hpencil
&& n
> 0 ?
'P' : 'R'), ui
->hx
, ui
->hy
, n
);
1335 if (!ui
->hcursor
) ui
->hshow
= 0;
1340 if (button
== 'M' || button
== 'm')
1346 static game_state
*execute_move(game_state
*from
, char *move
)
1348 int w
= from
->par
.w
, a
= w
*w
;
1352 if (move
[0] == 'S') {
1353 ret
= dup_game(from
);
1354 ret
->completed
= ret
->cheated
= TRUE
;
1356 for (i
= 0; i
< a
; i
++) {
1357 if (move
[i
+1] < '1' || move
[i
+1] > '0'+w
) {
1361 ret
->grid
[i
] = move
[i
+1] - '0';
1365 if (move
[a
+1] != '\0') {
1371 } else if ((move
[0] == 'P' || move
[0] == 'R') &&
1372 sscanf(move
+1, "%d,%d,%d", &x
, &y
, &n
) == 3 &&
1373 x
>= 0 && x
< w
&& y
>= 0 && y
< w
&& n
>= 0 && n
<= w
) {
1374 if (from
->clues
->immutable
[y
*w
+x
])
1377 ret
= dup_game(from
);
1378 if (move
[0] == 'P' && n
> 0) {
1379 ret
->pencil
[y
*w
+x
] ^= 1L << n
;
1381 ret
->grid
[y
*w
+x
] = n
;
1382 ret
->pencil
[y
*w
+x
] = 0;
1384 if (!ret
->completed
&& !check_errors(ret
, NULL
))
1385 ret
->completed
= TRUE
;
1388 } else if (move
[0] == 'M') {
1390 * Fill in absolutely all pencil marks everywhere. (I
1391 * wouldn't use this for actual play, but it's a handy
1392 * starting point when following through a set of
1393 * diagnostics output by the standalone solver.)
1395 ret
= dup_game(from
);
1396 for (i
= 0; i
< a
; i
++) {
1398 ret
->pencil
[i
] = (1L << (w
+1)) - (1L << 1);
1402 return NULL
; /* couldn't parse move string */
1405 /* ----------------------------------------------------------------------
1409 #define SIZE(w) ((w) * TILESIZE + 2*BORDER)
1411 static void game_compute_size(game_params
*params
, int tilesize
,
1414 /* Ick: fake up `ds->tilesize' for macro expansion purposes */
1415 struct { int tilesize
; } ads
, *ds
= &ads
;
1416 ads
.tilesize
= tilesize
;
1418 *x
= *y
= SIZE(params
->w
);
1421 static void game_set_size(drawing
*dr
, game_drawstate
*ds
,
1422 game_params
*params
, int tilesize
)
1424 ds
->tilesize
= tilesize
;
1427 static float *game_colours(frontend
*fe
, int *ncolours
)
1429 float *ret
= snewn(3 * NCOLOURS
, float);
1431 frontend_default_colour(fe
, &ret
[COL_BACKGROUND
* 3]);
1433 ret
[COL_GRID
* 3 + 0] = 0.0F
;
1434 ret
[COL_GRID
* 3 + 1] = 0.0F
;
1435 ret
[COL_GRID
* 3 + 2] = 0.0F
;
1437 ret
[COL_USER
* 3 + 0] = 0.0F
;
1438 ret
[COL_USER
* 3 + 1] = 0.6F
* ret
[COL_BACKGROUND
* 3 + 1];
1439 ret
[COL_USER
* 3 + 2] = 0.0F
;
1441 ret
[COL_HIGHLIGHT
* 3 + 0] = 0.78F
* ret
[COL_BACKGROUND
* 3 + 0];
1442 ret
[COL_HIGHLIGHT
* 3 + 1] = 0.78F
* ret
[COL_BACKGROUND
* 3 + 1];
1443 ret
[COL_HIGHLIGHT
* 3 + 2] = 0.78F
* ret
[COL_BACKGROUND
* 3 + 2];
1445 ret
[COL_ERROR
* 3 + 0] = 1.0F
;
1446 ret
[COL_ERROR
* 3 + 1] = 0.0F
;
1447 ret
[COL_ERROR
* 3 + 2] = 0.0F
;
1449 ret
[COL_PENCIL
* 3 + 0] = 0.5F
* ret
[COL_BACKGROUND
* 3 + 0];
1450 ret
[COL_PENCIL
* 3 + 1] = 0.5F
* ret
[COL_BACKGROUND
* 3 + 1];
1451 ret
[COL_PENCIL
* 3 + 2] = ret
[COL_BACKGROUND
* 3 + 2];
1453 *ncolours
= NCOLOURS
;
1457 static const char *const minus_signs
[] = { "\xE2\x88\x92", "-" };
1458 static const char *const times_signs
[] = { "\xC3\x97", "*" };
1459 static const char *const divide_signs
[] = { "\xC3\xB7", "/" };
1461 static game_drawstate
*game_new_drawstate(drawing
*dr
, game_state
*state
)
1463 int w
= state
->par
.w
/*, a = w*w */;
1464 struct game_drawstate
*ds
= snew(struct game_drawstate
);
1468 ds
->started
= FALSE
;
1469 ds
->tiles
= snewn((w
+2)*(w
+2), long);
1470 for (i
= 0; i
< (w
+2)*(w
+2); i
++)
1472 ds
->errtmp
= snewn((w
+2)*(w
+2), int);
1477 static void game_free_drawstate(drawing
*dr
, game_drawstate
*ds
)
1484 static void draw_tile(drawing
*dr
, game_drawstate
*ds
, struct clues
*clues
,
1485 int x
, int y
, long tile
)
1487 int w
= clues
->w
/* , a = w*w */;
1492 tx
= BORDER
+ x
* TILESIZE
+ 1;
1493 ty
= BORDER
+ y
* TILESIZE
+ 1;
1497 cw
= tw
= TILESIZE
-1;
1498 ch
= th
= TILESIZE
-1;
1500 clip(dr
, cx
, cy
, cw
, ch
);
1502 /* background needs erasing */
1503 draw_rect(dr
, cx
, cy
, cw
, ch
,
1504 (tile
& DF_HIGHLIGHT
) ? COL_HIGHLIGHT
: COL_BACKGROUND
);
1506 /* pencil-mode highlight */
1507 if (tile
& DF_HIGHLIGHT_PENCIL
) {
1511 coords
[2] = cx
+cw
/2;
1514 coords
[5] = cy
+ch
/2;
1515 draw_polygon(dr
, coords
, 3, COL_HIGHLIGHT
, COL_HIGHLIGHT
);
1518 /* new number needs drawing? */
1519 if (tile
& DF_DIGIT_MASK
) {
1521 str
[0] = (tile
& DF_DIGIT_MASK
) + '0';
1522 draw_text(dr
, tx
+ TILESIZE
/2, ty
+ TILESIZE
/2, FONT_VARIABLE
,
1523 (tile
& DF_PLAYAREA ? TILESIZE
/2 : TILESIZE
*2/5),
1524 ALIGN_VCENTRE
| ALIGN_HCENTRE
,
1525 (tile
& DF_ERROR
) ? COL_ERROR
:
1526 (x
< 0 || y
< 0 || x
>= w
|| y
>= w
) ? COL_GRID
:
1527 (tile
& DF_IMMUTABLE
) ? COL_GRID
: COL_USER
, str
);
1532 int pw
, ph
, minph
, pbest
, fontsize
;
1534 /* Count the pencil marks required. */
1535 for (i
= 1, npencil
= 0; i
<= w
; i
++)
1536 if (tile
& (1L << (i
+ DF_PENCIL_SHIFT
)))
1543 * Determine the bounding rectangle within which we're going
1544 * to put the pencil marks.
1546 /* Start with the whole square */
1553 * We arrange our pencil marks in a grid layout, with
1554 * the number of rows and columns adjusted to allow the
1555 * maximum font size.
1557 * So now we work out what the grid size ought to be.
1562 for (pw
= 3; pw
< max(npencil
,4); pw
++) {
1565 ph
= (npencil
+ pw
- 1) / pw
;
1566 ph
= max(ph
, minph
);
1567 fw
= (pr
- pl
) / (float)pw
;
1568 fh
= (pb
- pt
) / (float)ph
;
1570 if (fs
> bestsize
) {
1577 ph
= (npencil
+ pw
- 1) / pw
;
1578 ph
= max(ph
, minph
);
1581 * Now we've got our grid dimensions, work out the pixel
1582 * size of a grid element, and round it to the nearest
1583 * pixel. (We don't want rounding errors to make the
1584 * grid look uneven at low pixel sizes.)
1586 fontsize
= min((pr
- pl
) / pw
, (pb
- pt
) / ph
);
1589 * Centre the resulting figure in the square.
1591 pl
= tx
+ (TILESIZE
- fontsize
* pw
) / 2;
1592 pt
= ty
+ (TILESIZE
- fontsize
* ph
) / 2;
1595 * Now actually draw the pencil marks.
1597 for (i
= 1, j
= 0; i
<= w
; i
++)
1598 if (tile
& (1L << (i
+ DF_PENCIL_SHIFT
))) {
1599 int dx
= j
% pw
, dy
= j
/ pw
;
1603 draw_text(dr
, pl
+ fontsize
* (2*dx
+1) / 2,
1604 pt
+ fontsize
* (2*dy
+1) / 2,
1605 FONT_VARIABLE
, fontsize
,
1606 ALIGN_VCENTRE
| ALIGN_HCENTRE
, COL_PENCIL
, str
);
1614 draw_update(dr
, cx
, cy
, cw
, ch
);
1617 static void game_redraw(drawing
*dr
, game_drawstate
*ds
, game_state
*oldstate
,
1618 game_state
*state
, int dir
, game_ui
*ui
,
1619 float animtime
, float flashtime
)
1621 int w
= state
->par
.w
/*, a = w*w */;
1626 * The initial contents of the window are not guaranteed and
1627 * can vary with front ends. To be on the safe side, all
1628 * games should start by drawing a big background-colour
1629 * rectangle covering the whole window.
1631 draw_rect(dr
, 0, 0, SIZE(w
), SIZE(w
), COL_BACKGROUND
);
1634 * Big containing rectangle.
1636 draw_rect(dr
, COORD(0), COORD(0),
1637 w
*TILESIZE
+1, w
*TILESIZE
+1,
1640 draw_update(dr
, 0, 0, SIZE(w
), SIZE(w
));
1645 check_errors(state
, ds
->errtmp
);
1650 for (i
= 0; i
< 4*w
; i
++) {
1651 long tile
= state
->clues
->clues
[i
];
1656 CLUEPOS(x
, y
, i
, w
);
1658 if (ds
->errtmp
[(y
+1)*(w
+2)+(x
+1)])
1661 if (ds
->tiles
[(y
+1)*(w
+2)+(x
+1)] != tile
) {
1662 ds
->tiles
[(y
+1)*(w
+2)+(x
+1)] = tile
;
1663 draw_tile(dr
, ds
, state
->clues
, x
, y
, tile
);
1668 * Draw the main grid.
1670 for (y
= 0; y
< w
; y
++) {
1671 for (x
= 0; x
< w
; x
++) {
1672 long tile
= DF_PLAYAREA
;
1674 if (state
->grid
[y
*w
+x
])
1675 tile
|= state
->grid
[y
*w
+x
];
1677 tile
|= (long)state
->pencil
[y
*w
+x
] << DF_PENCIL_SHIFT
;
1679 if (ui
->hshow
&& ui
->hx
== x
&& ui
->hy
== y
)
1680 tile
|= (ui
->hpencil ? DF_HIGHLIGHT_PENCIL
: DF_HIGHLIGHT
);
1682 if (state
->clues
->immutable
[y
*w
+x
])
1683 tile
|= DF_IMMUTABLE
;
1685 if (flashtime
> 0 &&
1686 (flashtime
<= FLASH_TIME
/3 ||
1687 flashtime
>= FLASH_TIME
*2/3))
1688 tile
|= DF_HIGHLIGHT
; /* completion flash */
1690 if (ds
->errtmp
[(y
+1)*(w
+2)+(x
+1)])
1693 if (ds
->tiles
[(y
+1)*(w
+2)+(x
+1)] != tile
) {
1694 ds
->tiles
[(y
+1)*(w
+2)+(x
+1)] = tile
;
1695 draw_tile(dr
, ds
, state
->clues
, x
, y
, tile
);
1701 static float game_anim_length(game_state
*oldstate
, game_state
*newstate
,
1702 int dir
, game_ui
*ui
)
1707 static float game_flash_length(game_state
*oldstate
, game_state
*newstate
,
1708 int dir
, game_ui
*ui
)
1710 if (!oldstate
->completed
&& newstate
->completed
&&
1711 !oldstate
->cheated
&& !newstate
->cheated
)
1716 static int game_timing_state(game_state
*state
, game_ui
*ui
)
1718 if (state
->completed
)
1723 static void game_print_size(game_params
*params
, float *x
, float *y
)
1728 * We use 9mm squares by default, like Solo.
1730 game_compute_size(params
, 900, &pw
, &ph
);
1735 static void game_print(drawing
*dr
, game_state
*state
, int tilesize
)
1737 int w
= state
->par
.w
;
1738 int ink
= print_mono_colour(dr
, 0);
1741 /* Ick: fake up `ds->tilesize' for macro expansion purposes */
1742 game_drawstate ads
, *ds
= &ads
;
1743 game_set_size(dr
, ds
, NULL
, tilesize
);
1748 print_line_width(dr
, 3 * TILESIZE
/ 40);
1749 draw_rect_outline(dr
, BORDER
, BORDER
, w
*TILESIZE
, w
*TILESIZE
, ink
);
1754 for (x
= 1; x
< w
; x
++) {
1755 print_line_width(dr
, TILESIZE
/ 40);
1756 draw_line(dr
, BORDER
+x
*TILESIZE
, BORDER
,
1757 BORDER
+x
*TILESIZE
, BORDER
+w
*TILESIZE
, ink
);
1759 for (y
= 1; y
< w
; y
++) {
1760 print_line_width(dr
, TILESIZE
/ 40);
1761 draw_line(dr
, BORDER
, BORDER
+y
*TILESIZE
,
1762 BORDER
+w
*TILESIZE
, BORDER
+y
*TILESIZE
, ink
);
1768 for (i
= 0; i
< 4*w
; i
++) {
1771 if (!state
->clues
->clues
[i
])
1774 CLUEPOS(x
, y
, i
, w
);
1776 sprintf (str
, "%d", state
->clues
->clues
[i
]);
1778 draw_text(dr
, BORDER
+ x
*TILESIZE
+ TILESIZE
/2,
1779 BORDER
+ y
*TILESIZE
+ TILESIZE
/2,
1780 FONT_VARIABLE
, TILESIZE
/2,
1781 ALIGN_VCENTRE
| ALIGN_HCENTRE
, ink
, str
);
1785 * Numbers for the solution, if any.
1787 for (y
= 0; y
< w
; y
++)
1788 for (x
= 0; x
< w
; x
++)
1789 if (state
->grid
[y
*w
+x
]) {
1792 str
[0] = state
->grid
[y
*w
+x
] + '0';
1793 draw_text(dr
, BORDER
+ x
*TILESIZE
+ TILESIZE
/2,
1794 BORDER
+ y
*TILESIZE
+ TILESIZE
/2,
1795 FONT_VARIABLE
, TILESIZE
/2,
1796 ALIGN_VCENTRE
| ALIGN_HCENTRE
, ink
, str
);
1801 #define thegame towers
1804 const struct game thegame
= {
1805 "Towers", "games.towers", "towers",
1812 TRUE
, game_configure
, custom_params
,
1820 TRUE
, game_can_format_as_text_now
, game_text_format
,
1828 PREFERRED_TILESIZE
, game_compute_size
, game_set_size
,
1831 game_free_drawstate
,
1835 TRUE
, FALSE
, game_print_size
, game_print
,
1836 FALSE
, /* wants_statusbar */
1837 FALSE
, game_timing_state
,
1838 REQUIRE_RBUTTON
| REQUIRE_NUMPAD
, /* flags */
1841 #ifdef STANDALONE_SOLVER
1845 int main(int argc
, char **argv
)
1849 char *id
= NULL
, *desc
, *err
;
1851 int ret
, diff
, really_show_working
= FALSE
;
1853 while (--argc
> 0) {
1855 if (!strcmp(p
, "-v")) {
1856 really_show_working
= TRUE
;
1857 } else if (!strcmp(p
, "-g")) {
1859 } else if (*p
== '-') {
1860 fprintf(stderr
, "%s: unrecognised option `%s'\n", argv
[0], p
);
1868 fprintf(stderr
, "usage: %s [-g | -v] <game_id>\n", argv
[0]);
1872 desc
= strchr(id
, ':');
1874 fprintf(stderr
, "%s: game id expects a colon in it\n", argv
[0]);
1879 p
= default_params();
1880 decode_params(p
, id
);
1881 err
= validate_desc(p
, desc
);
1883 fprintf(stderr
, "%s: %s\n", argv
[0], err
);
1886 s
= new_game(NULL
, p
, desc
);
1889 * When solving an Easy puzzle, we don't want to bother the
1890 * user with Hard-level deductions. For this reason, we grade
1891 * the puzzle internally before doing anything else.
1893 ret
= -1; /* placate optimiser */
1894 solver_show_working
= FALSE
;
1895 for (diff
= 0; diff
< DIFFCOUNT
; diff
++) {
1896 memcpy(s
->grid
, s
->clues
->immutable
, p
->w
* p
->w
);
1897 ret
= solver(p
->w
, s
->clues
->clues
, s
->grid
, diff
);
1902 if (diff
== DIFFCOUNT
) {
1904 printf("Difficulty rating: ambiguous\n");
1906 printf("Unable to find a unique solution\n");
1909 if (ret
== diff_impossible
)
1910 printf("Difficulty rating: impossible (no solution exists)\n");
1912 printf("Difficulty rating: %s\n", towers_diffnames
[ret
]);
1914 solver_show_working
= really_show_working
;
1915 memcpy(s
->grid
, s
->clues
->immutable
, p
->w
* p
->w
);
1916 ret
= solver(p
->w
, s
->clues
->clues
, s
->grid
, diff
);
1918 printf("Puzzle is inconsistent\n");
1920 fputs(game_text_format(s
), stdout
);
1929 /* vim: set shiftwidth=4 tabstop=8: */