1 /* rrsolve - Simple RR solver and librr client.
3 * Copyright © 2003 Carl Worth
5 * Permission to use, copy, modify, distribute, and sell this software
6 * and its documentation for any purpose is hereby granted without
7 * fee, provided that the above copyright notice appear in all copies
8 * and that both that copyright notice and this permission notice
9 * appear in supporting documentation, and that the name of Carl Worth
10 * not be used in advertising or publicity pertaining to distribution
11 * of the software without specific, written prior permission.
12 * Carl Worth makes no representations about the suitability of this
13 * software for any purpose. It is provided "as is" without express
14 * or implied warranty.
16 * CARL WORTH DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
18 * NO EVENT SHALL CARL WORTH BE LIABLE FOR ANY SPECIAL, INDIRECT OR
19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
20 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
21 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
22 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 * Author: Carl Worth <carl@theworths.org>
35 #define HOST "localhost"
37 #define USER "rrsolve"
40 /* Tuning this can reduce excess reallocs */
41 #define RRS_BRANCHING_FACTOR_ESTIMATE 10
43 #define RRS_STATE_SET_ROBOT(s, ri, x, y) ((s) |= (((y) << ((ri)<<3)) | ((x) << (((ri)<<3) + 4))))
44 #define RRS_STATE_GET_ROBOT(s, ri, x, y) { (y) = ((s) >> ((ri)<<3)) & 0xf; (x) = ((s) >> (((ri)<<3) + 4)) & 0xf; }
47 handle_events (rr_client_t *client);
50 rrs_state_get_from_board (rr_board_t *board);
53 rrs_solution_print (rrs_solution_t *solution);
56 solve_board (rr_board_t *board, rrs_solution_t *solution);
59 find_solution_states (rr_board_t *board,
60 rrs_state_buf_t ***solution_states,
62 rrs_state_t *final_state);
65 rrs_find_new_states (rr_board_t *board,
66 rrs_state_buf_t **previous,
69 rrs_state_t *solution_state);
72 trace_solution (rr_board_t *board,
73 rrs_state_buf_t **states, int moves,
74 rrs_state_t solution_state,
75 rrs_solution_t *solution);
78 " === === === === === === === === === === === === === === === === \n"
79 "|... ... ... ...|r.. ... ... ... ... ... ... ...|... ... ... ...|\n"
81 "|... ... ... ... ... ... ... ... ... ... ... ... ...|.rs Y.. ...|\n"
83 "|... ... ... ... ... .bo|... ... ... .bt|... ... ... ... ... ...|\n"
85 "|... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...|\n"
87 "|... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...|\n"
89 "|... ... .gc|... ... ... ...|.rt ... ... ... ... ... ...|.go ...|\n"
91 "|... ... ... ... ... ... ... ... ... ... ... .yc|... ... ... ...|\n"
93 "|...|.YS ... ... ... ... ...|... ...|... ... ... ... ... ... ...|\n"
95 "|... ... ... ... ... ... ...|... ...|... ... ...|.ww ... ... ...|\n"
97 "|... .yo|... ... ...|bbs ... ... ... ...|.bc ... ... ... ... ...|\n"
99 "|... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...|\n"
101 "|... ... ... ... ... ... ... ... ... .yt|... ... ... ... ... ...|\n"
103 "|... ... ... ... ... ... .rc|... ... ... ... ... ... ... .gs|...|\n"
105 "|... ... ... ... ... ... ... ... ... ... ... ... ... ... ... g..|\n"
107 "|... ...|.gt ... ... ... ... ... ... ... ... ... ...|.ro ... ...|\n"
109 "|... ... ... ... ... ...|... ... ... ... ...|... ... ... ... ...|\n"
110 " === === === === === === === === === === === === === === === === ";
112 Move #1 generated 11 new states.
113 Move #2 generated 59 new states.
114 Move #3 generated 216 new states.
115 Move #4 generated 640 new states.
116 Move #5 generated 1701 new states.
117 Move #6 generated 4239 new states.
118 Move #7 generated 10041 new states.
119 Move #8 generated 22678 new states.
120 Move #9 generated 49103 new states.
121 Move #10 generated 102154 new states.
122 Move #11 generated 204086 new states.
123 Move #12 generated 391534 new states.
124 Move #13 generated 722808 new states.
125 Move #14 generated 1285932 new states.
126 Move #15 generated 2204971 new states.
127 Found solution of 16 moves in 3694.8 seconds.
128 Traced solution in 0.052438 seconds.
130 Move #0: yellow east, south, west
131 Move #3: green south, west, north
132 Move #6: blue east, north, west, south
133 Move #10: yellow south, east, south
135 Move #14: yellow north
139 main (int argc, char *argv[])
145 args_parse (&args, argc, argv);
147 client = rr_client_create (args.host, args.port, args.user);
148 if (client == NULL) {
149 fprintf (stderr, "Failed connecting to %s:%s as %s\n",
150 args.host, args.port, args.user);
154 status = rr_client_join (client, GAME);
155 if (status == RR_STATUS_NO_GAME)
156 status = rr_client_new (client, GAME);
158 fprintf (stderr, "Error joining or creating game: %s\n", rr_status_str (status));
162 handle_events (client);
164 rr_client_destroy (client);
170 handle_events (rr_client_t *client)
175 rrs_solution_t solution;
178 struct timespec move_delay = { 1, 200000000l };
180 /* XXX: This block of code can go away when add a NOTICE BOARD
181 for new users joining a game. */
183 status = rr_client_show (client, &diagram);
185 fprintf (stderr, "Error in rr_client_show: %s\n", rr_status_str (status));
188 board = rr_board_create_from_str (diagram);
192 /* XXX: This block of code can go away when we add a NOTICE TURN
193 for new users joining a game in progress. */
195 rrs_solution_init (&solution);
196 solve_board (board, &solution);
197 rr_client_bid (client, solution.num_moves);
201 status = rr_client_next_notice (client, ¬ice);
203 if (status == RR_STATUS_EOF)
204 fprintf (stderr, "Server has disconnected. Exiting.\n");
206 fprintf (stderr, "ERROR during rr_client_next_notice: %s\n",
207 rr_status_str (status));
211 fprintf (stderr, "No notice during rr_client_next_notice\n");
215 switch (notice->type) {
216 /* XXX: The processing needed for GAMEOVER, JOIN, and TURN
217 is a mess right now. There should be one NOTICE to say
218 the board has changed and one to say a TURN has started,
219 rather than the current mess. */
220 case RR_NOTICE_GAMEOVER:
221 status = rr_client_show (client, &diagram);
223 fprintf (stderr, "Error in rr_client_show: %s\n", rr_status_str (status));
226 rr_board_parse (board, diagram);
230 rr_board_set_goal_target (board, notice->u.target);
231 rrs_solution_init (&solution);
232 solve_board (board, &solution);
233 rr_client_bid (client, solution.num_moves);
235 case RR_NOTICE_ACTIVATE:
236 for (i = 0; i < solution.num_moves; i++) {
237 status = rr_client_move (client,
238 solution.move[i].robot,
239 solution.move[i].dir);
241 rr_client_message (client, "Drat, looks like I was wrong.");
242 rr_client_pass (client);
245 nanosleep (&move_delay, NULL);
247 rrs_solution_fini (&solution);
249 case RR_NOTICE_ABANDON:
250 rr_client_abandon (client);
252 case RR_NOTICE_NOBID:
253 rr_client_nobid (client);
255 case RR_NOTICE_POSITION:
256 rr_board_position_robot (board,
257 notice->u.position.robot,
258 notice->u.position.x,
259 notice->u.position.y);
261 case RR_NOTICE_GAMESTATE:
262 if (notice->u.gamestate == RR_GAMESTATE_SHOW) {
263 if (solution.num_moves) {
264 printf ("My solution (%d moves):", solution.num_moves);
265 rrs_solution_print (&solution);
273 case RR_NOTICE_DISPOSE:
274 case RR_NOTICE_MESSAGE:
275 case RR_NOTICE_WATCH:
278 case RR_NOTICE_REVOKE:
279 case RR_NOTICE_TIMER:
280 case RR_NOTICE_ACTIVE:
283 case RR_NOTICE_RESET:
284 case RR_NOTICE_SCORE:
285 /* Ignore these notices */
295 rr_board_destroy (board);
299 rrs_solution_print (rrs_solution_t *solution)
302 rr_robot_t last_robot;
305 last_robot = RR_ROBOT_NONE;
306 for (i=0; i < solution->num_moves; i++) {
307 move = &solution->move[i];
308 if (move->robot == last_robot)
309 printf (", %s", rr_direction_str (move->dir));
311 printf ("\n Move #%d: %s %s",
312 i+1, rr_robot_str (move->robot), rr_direction_str (move->dir));
313 last_robot = move->robot;
319 rrs_state_get_from_board (rr_board_t *board)
327 for (i=0; i < RR_NUM_ROBOTS; i++) {
328 rr_board_find_robot (board, rr_robot_from_idx (i), &x, &y);
329 RRS_STATE_SET_ROBOT (state, i, x, y);
336 rrs_state_set_board (rrs_state_t state, rr_board_t *board)
341 for (i=0; i < RR_NUM_ROBOTS; i++) {
342 RRS_STATE_GET_ROBOT (state, i, x, y);
343 rr_board_position_robot (board, rr_robot_from_idx (i), x, y);
349 solve_board (rr_board_t *board, rrs_solution_t *solution)
353 rrs_state_t solution_state;
354 rrs_state_buf_t **states;
355 struct timeval tv_start, tv_end;
357 if (rr_board_solved (board)) {
358 printf ("Board is solved to begin with.\n");
359 return RR_STATUS_SUCCESS;
362 printf ("Now trying to solve:");
363 puts (rr_board_to_str (board));
365 gettimeofday (&tv_start, NULL);
367 status = find_solution_states (board, &states, &moves, &solution_state);
371 gettimeofday (&tv_end, NULL);
374 printf ("It seems impossible.\n");
376 printf ("Found solution of %d moves in %g seconds.\n",
378 tv_end.tv_sec - tv_start.tv_sec
379 + (tv_end.tv_usec - tv_start.tv_usec) / 1e6);
381 gettimeofday (&tv_start, NULL);
383 trace_solution (board, states, moves, solution_state, solution);
385 gettimeofday (&tv_end, NULL);
387 printf ("Traced solution in %g seconds.\n",
388 tv_end.tv_sec - tv_start.tv_sec
389 + (tv_end.tv_usec - tv_start.tv_usec) / 1e6);
392 for (i=0; i <= moves; i++) {
393 rrs_state_buf_destroy (states[i]);
399 return RR_STATUS_SUCCESS;
403 rrs_state_connected (rrs_state_t a, rrs_state_t b,
404 rr_robot_t *robot, rr_direction_t *dir)
408 rrs_state_t diff, mask;
414 for (i=0; i < 8; i++) {
427 *robot = RR_ROBOT_BLUE;
431 *robot = RR_ROBOT_GREEN;
435 *robot = RR_ROBOT_RED;
439 *robot = RR_ROBOT_YELLOW;
445 delta = ((b & mask) >> shift) - ((a & mask) >> shift);
449 *dir = RR_DIRECTION_WEST;
451 *dir = RR_DIRECTION_EAST;
454 *dir = RR_DIRECTION_NORTH;
456 *dir = RR_DIRECTION_SOUTH;
462 trace_solution (rr_board_t *board,
463 rrs_state_buf_t **states, int moves,
464 rrs_state_t solution_state,
465 rrs_solution_t *solution)
469 rrs_state_buf_t *buf;
471 rr_robot_t robot, robot_found, last_robot_found = RR_ROBOT_NONE;
472 rr_direction_t dir, dir_found;
473 rrs_state_t state_found;
475 for (i = moves-1; i >= 0; i--) {
477 for (j = 0; j < buf->num_states; j++) {
478 if (rrs_state_connected (buf->state[j], solution_state,
480 rrs_state_set_board (buf->state[j], board);
481 status = rr_board_move (board, robot, dir);
482 if (status == RR_STATUS_SUCCESS) {
483 if (rrs_state_get_from_board (board) == solution_state) {
487 state_found = buf->state[j];
488 if (robot_found == last_robot_found)
491 last_robot_found = robot_found;
498 rrs_solution_prepend (solution, robot_found, dir_found);
499 solution_state = state_found;
501 fprintf (stderr, "ERROR: Failed to trace solution backwards to 0x%x at move %d\n",
502 solution_state, i+1);
509 find_solution_states (rr_board_t *board,
510 rrs_state_buf_t ***solution_states,
512 rrs_state_t *final_state)
516 rrs_state_buf_t **states, **new_states;
518 states = malloc (sizeof (rrs_state_buf_t *));
520 return RR_STATUS_NO_MEMORY;
522 initial = rrs_state_get_from_board (board);
524 states[0] = rrs_state_buf_create (1);
525 if (states[0] == NULL)
526 return RR_STATUS_NO_MEMORY;
527 rrs_state_buf_add (states[0], initial);
533 new_states = realloc (states, (moves + 1) * sizeof (rrs_state_buf_t *));
534 if (new_states == NULL)
535 return RR_STATUS_NO_MEMORY;
538 states[moves] = rrs_state_buf_create (RRS_BRANCHING_FACTOR_ESTIMATE
539 * states[moves-1]->num_states);
540 if (states[moves] == NULL)
541 return RR_STATUS_NO_MEMORY;
543 solved = rrs_find_new_states (board, states, moves-1, states[moves], final_state);
548 if (states[moves]->num_states == 0) {
549 printf ("Can't make any further progress after %d moves.\n", moves);
553 printf ("Move #%d generated %d new states.\n",
554 moves, states[moves]->num_states);
558 *num_state_buf = moves;
559 *solution_states = states;
561 return RR_STATUS_SUCCESS;
565 state_has_been_seen (rrs_state_buf_t **previous,
571 for (i=0; i <= moves; i++)
572 if (rrs_state_buf_contains (previous[i], state))
578 rrs_find_new_states (rr_board_t *board,
579 rrs_state_buf_t **previous,
581 rrs_state_buf_t *new,
582 rrs_state_t *solution_state)
586 rrs_state_t state, new_state;
587 rrs_state_buf_t *initial;
591 initial = previous[moves];
593 for (i = 0; i < initial->num_states; i++) {
594 state = initial->state[i];
596 rrs_state_set_board (state, board);
597 for (ri = 0; ri < RR_NUM_ROBOTS; ri++) {
598 robot = rr_robot_from_idx (ri);
599 for (dir = RR_DIRECTION_NORTH; dir <= RR_DIRECTION_EAST; dir++) {
600 status = rr_board_move (board, robot, dir);
601 if (status == RR_STATUS_SUCCESS) {
602 new_state = rrs_state_get_from_board (board);
603 if (! state_has_been_seen (previous, moves, new_state)) {
604 rrs_state_buf_add_sorted (new, new_state);
605 if (rr_board_solved (board)) {
606 *solution_state = new_state;
610 rr_board_undo (board);