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Prevent starting in a solved state in Fifteen & Flood

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(cherry picked from Android port, commit
cb38abdc71780bd9b393b90514396c338306fa69)
This commit is contained in:
Chris Boyle
2016-12-21 20:01:25 +00:00
committed by Ben Harris
parent 0d43753ff2
commit f967bfa87b
2 changed files with 78 additions and 69 deletions
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15
fifteen.c
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@ -156,6 +156,14 @@ static int perm_parity(int *perm, int n)
return ret; return ret;
} }
static int is_completed(int *tiles, int n) {
int p;
for (p = 0; p < n; p++)
if (tiles[p] != (p < n-1 ? p+1 : 0))
return 0;
return 1;
}
static char *new_game_desc(const game_params *params, random_state *rs, static char *new_game_desc(const game_params *params, random_state *rs,
char **aux, bool interactive) char **aux, bool interactive)
{ {
@ -171,6 +179,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
tiles = snewn(n, int); tiles = snewn(n, int);
used = snewn(n, bool); used = snewn(n, bool);
do {
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
tiles[i] = -1; tiles[i] = -1;
used[i] = false; used[i] = false;
@ -246,6 +255,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
tiles[x2] = p1; tiles[x2] = p1;
assert(perm_parity(tiles, n) == parity); assert(perm_parity(tiles, n) == parity);
} }
} while (is_completed(tiles, n));
/* /*
* Now construct the game description, by describing the tile * Now construct the game description, by describing the tile
@ -786,11 +796,8 @@ static game_state *execute_move(const game_state *from, const char *move)
/* /*
* See if the game has been completed. * See if the game has been completed.
*/ */
if (!ret->completed) { if (!ret->completed && is_completed(ret->tiles, ret->n)) {
ret->completed = ret->movecount; ret->completed = ret->movecount;
for (p = 0; p < ret->n; p++)
if (ret->tiles[p] != (p < ret->n-1 ? p+1 : 0))
ret->completed = 0;
} }
return ret; return ret;

2
flood.c
View File

@ -552,8 +552,10 @@ static char *new_game_desc(const game_params *params, random_state *rs,
/* /*
* Invent a random grid. * Invent a random grid.
*/ */
do {
for (i = 0; i < wh; i++) for (i = 0; i < wh; i++)
scratch->grid[i] = random_upto(rs, params->colours); scratch->grid[i] = random_upto(rs, params->colours);
} while (completed(w, h, scratch->grid));
/* /*
* Run the solver, and count how many moves it uses. * Run the solver, and count how many moves it uses.