aboutsummaryrefslogtreecommitdiff
path: root/include/actions.c
diff options
context:
space:
mode:
Diffstat (limited to 'include/actions.c')
-rw-r--r--include/actions.c508
1 files changed, 276 insertions, 232 deletions
diff --git a/include/actions.c b/include/actions.c
index 795c135..6303822 100644
--- a/include/actions.c
+++ b/include/actions.c
@@ -16,37 +16,42 @@
*/
#include "actions.h"
+#include "tak.h"
+
+#include <stdio.h>
+
+static uint8_t al_board_size;
// ===================================================================
// Helper method declarations
// ===================================================================
-#define DANGER_MIN(a,b) (((a)<(b))?(a):(b))
+#define DANGER_MIN(a, b) (((a) < (b)) ? (a) : (b))
#define CLR_STONE NUM_MASK
-static inline void
-list_append(action_list_t *list, const enum A_TYPE type,
- const int8_t loc, const uint8_t data0,
- const uint8_t data1);
+static inline void list_append(action_list_t *list, const enum A_TYPE type,
+ const int8_t loc, const uint8_t data0,
+ const uint8_t data1);
+
+static inline void list_prepend(action_list_t *list, const enum A_TYPE type,
+ const int8_t loc, const uint8_t data0,
+ const uint8_t data1);
-static inline void
-list_prepend(action_list_t *list, const enum A_TYPE type,
- const int8_t loc, const uint8_t data0,
- const uint8_t data1);
+static inline void inline_next_ply(tak_state_p state);
-static inline void
-inline_next_ply(void);
+static inline void inline_prev_ply(tak_state_p state);
-static inline void
-inline_prev_ply(void);
+static inline uint8_t check_no_overflow(tak_state_p state, const uint8_t loc,
+ const int8_t delta, const uint8_t num,
+ const uint8_t steps,
+ const uint8_t gaps);
// ===================================================================
// Exported method implementations
// ===================================================================
-int action_move_to_front(const action_t action,
- action_list_t *list) {
+int action_move_to_front(const action_t action, action_list_t *list) {
action_node_t *n = list->head;
// TODO: what if it's not in the list?
@@ -64,7 +69,6 @@ int action_move_to_front(const action_t action,
return EXIT_FAILURE;
}
-
void action_list_free(action_list_t *list) {
if (list) {
action_node_t *n = list->head, *nn;
@@ -80,7 +84,8 @@ void action_list_free(action_list_t *list) {
// Keep track of move offsets
int8_t move_deltas[4];
-void action_list_init(void) {
+void action_list_init(const uint8_t board_size) {
+ al_board_size = board_size;
move_deltas[0] = +board_size;
move_deltas[1] = -board_size;
move_deltas[2] = -1;
@@ -89,7 +94,7 @@ void action_list_init(void) {
// We bias place over move by prepending place actions and appending
// move actions to the generated list
-action_list_t *action_list_generate(void) {
+action_list_t *action_list_generate(tak_state_p state) {
action_list_t *list = malloc(sizeof(struct action_list_s));
// TODO: trap errno
@@ -103,278 +108,297 @@ action_list_t *action_list_generate(void) {
* well save on the conditional.
*/
- const uint8_t material = (ply & 1) ? black_count : white_count,
- flat = material & 0x7F,
- cap = ((ply >= 2) && (material & 0x80)),
- standing = ((ply >= 2) && flat);
+ const uint8_t material =
+ (state->ply & 1) ? state->black_count : state->white_count,
+ flat = material & 0x7F,
+ cap = ((state->ply >= 2) && (material & 0x80)),
+ standing = ((state->ply >= 2) && flat);
// Step across the board
- for (int row = 0; row < board_size; row++) {
- for (int col = 0; col < board_size; col++) {
+ for (int row = 0; row < state->board_size; row++) {
+ for (int col = 0; col < state->board_size; col++) {
// We'll need these at various points: the location of this
// square and the maximum number of stones we could pick up
- const int loc = THE_COORDS(col, row);
- const uint8_t count = DANGER_MIN(COUNT_AT(loc), board_size);
+ const int loc = THE_COORDS(al_board_size, col, row);
+ const uint8_t count = DANGER_MIN(COUNT_AT(state, loc), al_board_size);
// Only try moves after CPS and if the colour is correct
if (count) {
- if (ply >= 2 && ((colours[loc] & 1) == current_colour)) {
-
- // Pre-compute end-stops and crushes
- uint8_t end_stops[4], crushes[4] = {0, 0, 0, 0};
-
- // These are upper bounds, not counting walls and such.
- // UP DOWN LEFT RIGHT
- end_stops[0] = DANGER_MIN(board_size - row - 1, count);
- end_stops[1] = DANGER_MIN(row, count);
- end_stops[2] = DANGER_MIN(col, count);
- end_stops[3] = DANGER_MIN(board_size - col - 1, count);
-
- // Now we check for caps and walls
- const uint8_t cap_top = STONE_AT(loc) == STONE_CAPSTONE;
- for (int d = 0; d < 4; d++){
- const int delta = move_deltas[d];
- const int stop = end_stops[d];
- end_stops[d] = 0;
- for (int k = 1; k <= stop; k++) {
- const enum STONE_VARIANT stone = STONE_AT(loc+k*delta);
- if (stone == STONE_STANDING) {
- if (cap_top) {
- crushes[d] = 0xFF;
- end_stops[d]++;
- }
- break;
- } else if (stone == STONE_CAPSTONE) {
- break;
- }
- end_stops[d]++;
- }
- }
- /*
- * For each direction, generate all possible ordered integer
- * partitions of 1 ≤ num ≤ count whose number of summands is
- * exactly 1 ≤ summands ≤ min(end_stops[dir], num) -- we
- * write summands as steps.
- *
- * We exploit the `gaps' bijection here and elsewhere
- * between ordered {integer partitions of n with s summands}
- * and {binary strings of length n-1 with s-1 set bits}.
- */
- for (enum MOVE_DIRECTION dir=M_UP; dir<=M_RIGHT; dir++) {
- for (uint8_t num = 1; num <= count; num++) {
- for (uint8_t steps = 1;
- steps <= end_stops[dir] && steps <= num;
- steps++) {
- uint8_t gaps =
- ((1<<(board_size - 2)) - 1) >> (board_size-steps-1);
- // For 5x5 this givess 0b0000[0XXX] where steps-1 of
- // those X's are 1s (starting with LSB) because 4-1=3
- // and 5-1=4
- do {
- /*
- * We skip the partition if it calls for multiple
- * stones at the end with a crush.
- */
- const uint8_t last_drop_check =
- (num > 1) ? (gaps & (1 << (num - 2))) : 1;
- if (crushes[dir] == 0 || last_drop_check) {
- // We have to record a crush!
- const uint8_t crush =
- (steps == end_stops[dir]) && crushes[dir];
- // Store the move
-
- list_append(list, A_MOVE, loc,
- (crush << 7) | gaps,
- (dir<<4) | num);
- }
- /*
- * With thanks to
- * https://graphics.stanford.edu/~seander/bithacks.html#NextBitPermutation
- * we have the following magic to generate the next
- * permutation of steps-many set bits
- */
- uint8_t t = (gaps | (gaps - 1));
- gaps = (t + 1)
- | (((~t & -~t) - 1) >> (__builtin_ctz(gaps) + 1));
- } while (gaps && (gaps + 1 <= (1 << (num - 1))));
- }
- }
- }
- }
+ if (state->ply >= 2 &&
+ ((state->colours[loc] & 1) == state->current_colour)) {
+
+ // Pre-compute end-stops and crushes
+ uint8_t end_stops[4], crushes[4] = {0, 0, 0, 0};
+
+ // These are upper bounds, not counting walls and such.
+ // UP DOWN LEFT RIGHT
+ end_stops[0] = DANGER_MIN(al_board_size - row - 1, count);
+ end_stops[1] = DANGER_MIN(row, count);
+ end_stops[2] = DANGER_MIN(col, count);
+ end_stops[3] = DANGER_MIN(al_board_size - col - 1, count);
+
+ // Now we check for caps and walls
+ const uint8_t cap_top = STONE_AT(state, loc) == STONE_CAPSTONE;
+ for (int d = 0; d < 4; d++) {
+ const int delta = move_deltas[d];
+ const int stop = end_stops[d];
+ end_stops[d] = 0;
+ for (int k = 1; k <= stop; k++) {
+ const enum STONE_VARIANT stone = STONE_AT(state, loc + k * delta);
+ if (stone == STONE_STANDING) {
+ if (cap_top) {
+ crushes[d] = k;
+ end_stops[d]++;
+ }
+ break;
+ } else if (stone == STONE_CAPSTONE) {
+ break;
+ }
+ end_stops[d]++;
+ }
+ }
+ /*
+ * For each direction, generate all possible ordered integer
+ * partitions of 1 ≤ num ≤ count whose number of summands is in the
+ * range 1 ≤ # summands ≤ min(end_stops[dir], num) -- we write
+ * summands as steps.
+ *
+ * We exploit the `gaps' bijection here and elsewhere between ordered
+ * {integer partitions of n with s summands} and {binary strings of
+ * length n-1 with s-1 set bits}.
+ */
+ for (enum MOVE_DIRECTION dir = M_UP; dir <= M_RIGHT; dir++) {
+ const int8_t delta = move_deltas[dir];
+ for (uint8_t num = 1; num <= count; num++) {
+ for (uint8_t steps = 1; steps <= end_stops[dir] && steps <= num;
+ steps++) {
+ uint8_t gaps = ((1 << (al_board_size - 2)) - 1) >>
+ (al_board_size - steps - 1);
+ // For 5x5 this gives 0b0000[0XXX] where steps-1 of those X's
+ // are 1s (starting with LSB) because 4-1=3 and 5-1=4
+ do {
+ /*
+ * We skip the partition if it calls for multiple stones at
+ * the end with a crush, or if it would cause any stack to
+ * grow beyond height 15.
+ */
+ const uint8_t no_overflow =
+ check_no_overflow(state, loc, delta, num, steps, gaps);
+ const uint8_t last_drop_check =
+ (num > 1) ? (gaps & (1 << (num - 2))) : 1;
+ const uint8_t can_and_must_crush =
+ crushes[dir] == steps && last_drop_check;
+ const uint8_t crush_check =
+ can_and_must_crush || crushes[dir] != steps;
+ if (no_overflow && crush_check) {
+ // Store the move
+ list_append(list, A_MOVE, loc,
+ (can_and_must_crush << 7) | gaps,
+ (dir << 4) | num);
+ }
+ /*
+ * With thanks to
+ * https://graphics.stanford.edu/~seander/bithacks.html#NextBitPermutation
+ * we have the following magic to generate the next
+ * permutation of steps-many set bits
+ */
+ uint8_t t = (gaps | (gaps - 1));
+ gaps =
+ (t + 1) | (((~t & -~t) - 1) >> (__builtin_ctz(gaps) + 1));
+ } while (gaps && (gaps + 1 <= (1 << (num - 1))));
+ }
+ }
+ }
+ }
} // end of if (count) { ... }
else if (material) {
- // Empty square, generate placements
- if (flat) {
- list_prepend(list, A_PLACE, loc, STONE_FLAT, 0);
- if (standing)
- list_prepend(list, A_PLACE, loc, STONE_STANDING,0);
- }
- if (cap)
- list_prepend(list, A_PLACE, loc, STONE_CAPSTONE, 0);
+ // Empty square, generate placements
+ if (flat) {
+ list_prepend(list, A_PLACE, loc, STONE_FLAT, 0);
+ if (standing)
+ list_prepend(list, A_PLACE, loc, STONE_STANDING, 0);
+ }
+ if (cap)
+ list_prepend(list, A_PLACE, loc, STONE_CAPSTONE, 0);
}
}
}
return list;
}
-void action_take(const action_t action) {
+void action_take(tak_state_p state, const action_t action) {
const int8_t loc = A_GET_LOC(action);
if (A_GET_TYPE(action) == A_PLACE) {
- const uint8_t black = (current_colour == C_BLACK);
+ const uint8_t black = (state->current_colour == C_BLACK);
switch (A_GET_DATA0(action)) {
- case STONE_FLAT: {
- if (black) black_count--;
- else white_count--;
- colours[loc] = current_colour;
- celldat[loc] = NUM_INC | STONE_FLAT;
- break;
- }
- case STONE_STANDING: {
- if (black) black_count--;
- else white_count--;
- colours[loc] = current_colour;
- celldat[loc] = NUM_INC | STONE_STANDING;
- break;
- }
- default: {
- if (black) black_count &= 0x7F;
- else white_count &= 0x7F;
- colours[loc] = current_colour;
- celldat[loc] = NUM_INC | STONE_CAPSTONE;
- break;
- }
+ case STONE_FLAT: {
+ if (black)
+ state->black_count--;
+ else
+ state->white_count--;
+ state->colours[loc] = state->current_colour;
+ state->celldat[loc] = NUM_INC | STONE_FLAT;
+ break;
+ }
+ case STONE_STANDING: {
+ if (black)
+ state->black_count--;
+ else
+ state->white_count--;
+ state->colours[loc] = state->current_colour;
+ state->celldat[loc] = NUM_INC | STONE_STANDING;
+ break;
+ }
+ default: {
+ if (black)
+ state->black_count &= 0x7F;
+ else
+ state->white_count &= 0x7F;
+ state->colours[loc] = state->current_colour;
+ state->celldat[loc] = NUM_INC | STONE_CAPSTONE;
+ break;
+ }
}
} else {
/*
- * See the discussion around line 135 for an explanation of the
- * encoding. Here we are not interested in whether we crushed, it
- * will work out by anyway because we overwrite the top stone
- * type. See (*) later for when we do need to know.
+ * See the discussion around line 160 for an explanation of the encoding.
+ * Here we are not interested in whether we crushed, it will work out by
+ * anyway because we overwrite the top stone type. See (*) later for when we
+ * do need to know.
*/
const uint8_t gaps = A_GET_DATA0(action) & 0x7F,
- num = A_GET_DATA1(action) & 0x0F, // unpack
- dir = A_GET_DATA1(action) >> 4;
+ num = A_GET_DATA1(action) & 0x0F, // unpack
+ dir = A_GET_DATA1(action) >> 4;
int8_t delta = move_deltas[dir];
// Use the Kernighan method to count the set bits
int8_t steps = 1;
- for (uint8_t _gaps = gaps; _gaps; steps++) _gaps &= _gaps - 1;
+ for (uint8_t _gaps = gaps; _gaps; steps++)
+ _gaps &= _gaps - 1;
// Move top stone type to destination
- celldat[loc+steps*delta] &= CLR_STONE; // necessary for crushing
- celldat[loc+steps*delta] |= STONE_AT(loc);
- celldat[loc] &= CLR_STONE;
- celldat[loc] |= STONE_FLAT; // should be optimised out
-
- uint8_t total = 1, gap_bit = 1 << (num - 2); // it's not important
- // what negative
- // shifts do here, we
- // don't use gap_bit
- // if num < 2
+ state->celldat[loc + steps * delta] &= CLR_STONE; // necessary for crushing
+ state->celldat[loc + steps * delta] |= STONE_AT(state, loc);
+ state->celldat[loc] &= CLR_STONE;
+ state->celldat[loc] |= STONE_FLAT; // should be optimised out
+
+ uint8_t total = 1, gap_bit = 1 << (num - 2); // it's not important what
+ // negative shifts do here, we
+ // don't use gap_bit if num < 2
+
// move stuff starting at destination
for (uint8_t d = 1; d < num; d++, total++, gap_bit >>= 1) {
// We took a step, move everything over so far
if (gaps & gap_bit) {
- colours[loc+steps*delta] <<= total;
- colours[loc+steps*delta] |= colours[loc] & ((1 << total) - 1);
- colours[loc] >>= total;
- celldat[loc+steps*delta] += total*NUM_INC;
- celldat[loc] -= total*NUM_INC;
- // Reset for next step
- total = 0;
- steps--;
+ state->colours[loc + steps * delta] <<= total;
+ state->colours[loc + steps * delta] |=
+ state->colours[loc] & ((1 << total) - 1);
+ state->colours[loc] >>= total;
+ state->celldat[loc + steps * delta] += total * NUM_INC;
+ state->celldat[loc] -= total * NUM_INC;
+ // Reset for next step
+ total = 0;
+ steps--;
}
}
// Move what remains (steps == 1 here always, so we simplify)
- colours[loc+delta] <<= total;
- colours[loc+delta] |= colours[loc] & ((1 << total) - 1);
- colours[loc] >>= total;
- celldat[loc+delta] += total*NUM_INC;
- celldat[loc] -= total*NUM_INC;
+ state->colours[loc + delta] <<= total;
+ state->colours[loc + delta] |= state->colours[loc] & ((1 << total) - 1);
+ state->colours[loc] >>= total;
+ state->celldat[loc + delta] += total * NUM_INC;
+ state->celldat[loc] -= total * NUM_INC;
}
// Next ply
- inline_next_ply();
+ inline_next_ply(state);
}
-void action_undo(const action_t action) {
+void action_undo(tak_state_p state, const action_t action) {
// Previous ply
- inline_prev_ply();
+ inline_prev_ply(state);
const int8_t loc = A_GET_LOC(action);
if (A_GET_TYPE(action) == A_PLACE) {
- const uint8_t black = (current_colour == C_BLACK);
- celldat[loc] = 0;
+ const uint8_t black = (state->current_colour == C_BLACK);
+ state->celldat[loc] = 0;
if (A_GET_DATA0(action) == STONE_CAPSTONE) {
- if (black) black_count |= 0x80;
- else white_count |= 0x80;
+ if (black)
+ state->black_count |= 0x80;
+ else
+ state->white_count |= 0x80;
} else {
- if (black) black_count++;
- else white_count++;
+ if (black)
+ state->black_count++;
+ else
+ state->white_count++;
}
} else {
// See action_take for comments, this is the time reversal, but
// there is one caveat -- undoing a crush! (*)
const uint8_t gaps = A_GET_DATA0(action) & 0x7F,
- crush = A_GET_DATA0(action) & 0x80,
- num = A_GET_DATA1(action) & 0x0F,
- dir = A_GET_DATA1(action) >> 4;
+ crush = A_GET_DATA0(action) & 0x80,
+ num = A_GET_DATA1(action) & 0x0F,
+ dir = A_GET_DATA1(action) >> 4;
const int8_t delta = move_deltas[dir];
int8_t steps = 1;
uint8_t gap_bit = 1, total = 1;
for (int8_t d = 1; d < num; d++, total++, gap_bit <<= 1) {
if (gaps & gap_bit) {
- colours[loc] <<= total;
- colours[loc] |= colours[loc+steps*delta] & ((1 << total) - 1);
- colours[loc+steps*delta] >>= total;
- celldat[loc] += total*NUM_INC;
- celldat[loc+steps*delta] -= total*NUM_INC;
- total = 0;
- steps++;
+ state->colours[loc] <<= total;
+ state->colours[loc] |=
+ state->colours[loc + steps * delta] & ((1 << total) - 1);
+ state->colours[loc + steps * delta] >>= total;
+ state->celldat[loc] += total * NUM_INC;
+ state->celldat[loc + steps * delta] -= total * NUM_INC;
+ total = 0;
+ steps++;
}
}
- colours[loc] <<= total;
- colours[loc] |= colours[loc+steps*delta] & ((1 << total) - 1);
- colours[loc+steps*delta] >>= total;
+ state->colours[loc] <<= total;
+ state->colours[loc] |=
+ state->colours[loc + steps * delta] & ((1 << total) - 1);
+ state->colours[loc + steps * delta] >>= total;
- celldat[loc] += total*NUM_INC;
+ state->celldat[loc] += total * NUM_INC;
// celldat[loc] &= CLR_STONE; is not necessary, as STONE_FLAT == 0
- celldat[loc] |= STONE_AT(loc+steps*delta);
- celldat[loc+steps*delta] -= total*NUM_INC;
- celldat[loc+steps*delta] &= CLR_STONE;
+ state->celldat[loc] |= STONE_AT(state, loc + steps * delta);
+ state->celldat[loc + steps * delta] -= total * NUM_INC;
+ state->celldat[loc + steps * delta] &= CLR_STONE;
if (crush) {
- celldat[loc+steps*delta] |= STONE_STANDING;
+ state->celldat[loc + steps * delta] |= STONE_STANDING;
} else {
- celldat[loc+steps*delta] |= STONE_FLAT; // should be optimised out
+ state->celldat[loc + steps * delta] |=
+ STONE_FLAT; // should be optimised out
}
}
}
-void action_to_ptn(const action_t action, char* out_ptn) {
+void action_to_ptn(const action_t action, char *out_ptn) {
const int8_t loc = A_GET_LOC(action);
if (A_GET_TYPE(action) == A_PLACE) {
- generate_place(loc, A_GET_DATA0(action), out_ptn);
+ generate_place(al_board_size, loc, A_GET_DATA0(action), out_ptn);
} else {
const uint8_t gaps = A_GET_DATA0(action) & 0x7F,
- num = A_GET_DATA1(action) & 0x0F, // unpack
- dir = A_GET_DATA1(action) >> 4;
+ num = A_GET_DATA1(action) & 0x0F, // unpack
+ dir = A_GET_DATA1(action) >> 4;
- uint8_t drops[board_size]; // we only ever need board_size-1 in
- // drops actually, the last spot is to
- // skip a bounds check at (**)
+ uint8_t drops[al_board_size]; // we only ever need al_board_size-1 in drops
+ // actually, the last spot is to skip a bounds
+ // check at (**)
uint8_t mask = 1, steps = 0;
// Translate to a drop sequence
- drops[0] = 1; mask = 1;
+ drops[0] = 1;
+ mask = 1;
for (uint8_t d = 1; d < num; d++) {
if (gaps & mask) {
- steps++;
- drops[steps] = 1; // (**) no bounds check
+ steps++;
+ drops[steps] = 1; // (**) no bounds check
} else {
- drops[steps] += 1;
+ drops[steps] += 1;
}
mask <<= 1;
}
- generate_move(loc, dir, steps+1, drops, out_ptn);
+ generate_move(al_board_size, loc, dir, steps + 1, drops, out_ptn);
}
}
@@ -382,10 +406,9 @@ void action_to_ptn(const action_t action, char* out_ptn) {
// Helper method implementations
// ===================================================================
-static inline void
-list_append(action_list_t *list, const enum A_TYPE type,
- const int8_t loc, const uint8_t data0,
- const uint8_t data1) {
+static inline void list_append(action_list_t *list, const enum A_TYPE type,
+ const int8_t loc, const uint8_t data0,
+ const uint8_t data1) {
action_node_t *new = malloc(sizeof(action_node_t));
// TODO: trap errno
@@ -403,10 +426,9 @@ list_append(action_list_t *list, const enum A_TYPE type,
list->length++;
}
-static inline void
-list_prepend(action_list_t *list, const enum A_TYPE type,
- const int8_t loc, const uint8_t data0,
- const uint8_t data1) {
+static inline void list_prepend(action_list_t *list, const enum A_TYPE type,
+ const int8_t loc, const uint8_t data0,
+ const uint8_t data1) {
action_node_t *new = malloc(sizeof(action_list_t));
// TODO: trap errno
@@ -421,24 +443,46 @@ list_prepend(action_list_t *list, const enum A_TYPE type,
list->length++;
}
-static inline void
-inline_next_ply(void) {
- ply++;
- if (ply == 2) {
- current_colour = C_WHITE;
+static inline void inline_next_ply(tak_state_p state) {
+ state->ply++;
+ if (state->ply == 2) {
+ state->current_colour = C_WHITE;
} else {
- if (current_colour == C_BLACK) current_colour = C_WHITE;
- else current_colour = C_BLACK;
+ if (state->current_colour == C_BLACK)
+ state->current_colour = C_WHITE;
+ else
+ state->current_colour = C_BLACK;
}
}
-static inline void
-inline_prev_ply(void) {
- if (ply>0) ply--;
- if (ply == 1) {
- current_colour = C_WHITE;
+static inline void inline_prev_ply(tak_state_p state) {
+ if (state->ply > 0)
+ state->ply--;
+ if (state->ply == 1) {
+ state->current_colour = C_WHITE;
} else {
- if (current_colour == C_BLACK) current_colour = C_WHITE;
- else current_colour = C_BLACK;
+ if (state->current_colour == C_BLACK)
+ state->current_colour = C_WHITE;
+ else
+ state->current_colour = C_BLACK;
+ }
+}
+
+static inline uint8_t check_no_overflow(tak_state_p state, const uint8_t loc,
+ const int8_t delta, const uint8_t num,
+ const uint8_t steps,
+ const uint8_t gaps) {
+ uint8_t total = 1, gap_bit = 1 << (num - 2), step = steps;
+ for (uint8_t d = 1; d < num; d++, total++, gap_bit >>= 1) {
+ if (gaps & gap_bit) {
+ if (COUNT_AT(state, loc + step * delta) + total > 15)
+ return 0;
+ step--;
+ total = 0;
+ }
}
+ if (COUNT_AT(state, loc + delta) + total > 15)
+ return 0;
+
+ return 1;
}
generated by cgit v1.2.3 (git 2.46.0) at 2026-08-30 08:46:30 +0000