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#include "aoc.h"
#include "allocator.h"
#include "iccmp.h"
#include "hmap.h"
#include "util.h"
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
struct vec2 {
int x, y;
};
struct panel {
struct vec2 pos;
int color;
};
int black = 0, white = 1;
/* counter clockwise dx dy */
struct vec2 dirs[] = {
{ 0, -1 }, /* up */
{ 1, 0 }, /* right */
{ 0, 1 }, /* down */
{ -1, 0 } /* left */
};
const char *solmap = "\
.............................................\n\
.............................................\n\
...#..#.###...##...##..####.#.....##..###....\n\
...#..#.#..#.#..#.#..#.#....#....#..#.#..#...\n\
...#..#.#..#.#....#..#.###..#....#....#..#...\n\
...#..#.###..#....####.#....#....#....###....\n\
...#..#.#.#..#..#.#..#.#....#....#..#.#......\n\
....##..#..#..##..#..#.#....####..##..#......\
";
uint32_t
hmap_pos_hash(struct hmap_key key)
{
const struct vec2 *vec = key.p;
uint32_t hash;
hash = (uint32_t) vec->x;
hash |= ((uint32_t) vec->y) << 16;
return hash;
}
bool
hmap_pos_keycmp(struct hmap_key k1, struct hmap_key k2)
{
const struct vec2 *v1 = k1.p, *v2 = k2.p;
return v1->x == v2->x && v1->y == v2->y;
}
char *
gen_map(struct hmap *panels, struct vec2 *pos, int rot)
{
const char symbol[4] = "^>v<";
struct vec2 min, max, dims;
struct hmap_iter iter;
const struct vec2 *ppos;
int i, color;
char *map;
min.x = min.y = -2;
max.x = max.y = 2;
for (HMAP_ITER(panels, iter)) {
ppos = iter.link->key.p;
min.x = MIN(min.x, ppos->x);
min.y = MIN(min.y, ppos->y);
max.x = MAX(max.x, ppos->x);
max.y = MAX(max.y, ppos->y);
}
if (pos) {
min.x = MIN(min.x, pos->x);
min.y = MIN(min.y, pos->y);
max.x = MAX(max.x, pos->x);
max.y = MAX(max.y, pos->y);
}
dims.x = max.x - min.x + 1;
dims.y = max.y - min.y + 1;
assert(dims.x > 0 && dims.y > 0);
map = malloc(((size_t) dims.x + 1) * (size_t) dims.y);
assert(map != NULL);
memset(map, '.', ((size_t) dims.x + 1) * (size_t) dims.y);
for (HMAP_ITER(panels, iter)) {
ppos = iter.link->key.p;
color = iter.link->value.i;
map[(ppos->y - min.y) * (dims.x + 1) + (ppos->x - min.x)] = color ? '#' : '.';
}
if (pos) {
map[(pos->y - min.y) * (dims.x + 1) + (pos->x - min.x)] = symbol[rot];
}
for (i = 0; i < dims.y; i++)
map[dims.x + i * (dims.x + 1)] = '\n';
map[(dims.x + 1) * dims.y - 1] = '\0';
return map;
}
void
panels_init(struct hmap *panels, int start_color)
{
struct hmap_link **link;
int color, rot, brot;
struct vec2 pos;
struct icc icc;
void *key;
char *map;
enum {
STATE_COLOR,
STATE_ROTATE
} state;
icc_init(&icc);
icc_parse_inst(&icc, aoc.input, aoc.input_size);
pos.x = pos.y = 0;
key = memdup(&pos, sizeof(pos));
hmap_add(panels, (struct hmap_key) {.p = key },
(struct hmap_val) {.i = start_color});
rot = 0;
color = 0;
state = STATE_COLOR;
while (icc.state != ICC_HALT) {
icc_step_inst(&icc);
switch (icc.state) {
case ICC_OUTPUT:
if (state == STATE_COLOR) {
color = (int) mi_cast_ul(&icc.out);
assert(color == 0 || color == 1);
aoc_debug("OUTPUT %i %i: %i\n", pos.x, pos.y, color);
link = hmap_link_pos(panels,
(struct hmap_key) {.p = &pos});
if (*link) {
(*link)->value.i = color;
} else {
key = memdup(&pos, sizeof(pos));
*link = hmap_link_alloc(panels,
(struct hmap_key) {.p = key},
(struct hmap_val) {.i = color},
NULL);
}
state = STATE_ROTATE;
} else if (state == STATE_ROTATE) {
brot = (int) mi_cast_ul(&icc.out);
assert(brot == 0 || brot == 1);
aoc_debug("ROT %i %i: %i\n", pos.x, pos.y, brot);
rot = (rot + (brot ? 1 : -1) + 4) % 4;
pos.x += dirs[rot].x;
pos.y += dirs[rot].y;
if (aoc.debug) {
map = gen_map(panels, &pos, rot);
aoc_debug("%s", map);
free(map);
}
state = STATE_COLOR;
}
break;
case ICC_INPUT:
link = hmap_link_get(panels,
(struct hmap_key) {.p = &pos});
if (link) {
aoc_debug("INPUT %i %i: %i\n", pos.x, pos.y,
(*link)->value.i);
mi_setv(&icc.in, (mi_ul) (*link)->value.i,
MI_POS);
} else {
aoc_debug("INPUT %i %i: 0\n", pos.x, pos.y);
mi_setv(&icc.in, 0, MI_POS);
}
break;
}
}
icc_deinit(&icc);
}
void
part1(void)
{
struct hmap panels;
struct hmap_iter iter;
int count;
hmap_init(&panels, 100, hmap_pos_hash, hmap_pos_keycmp,
&stdlib_strict_heap_allocator);
panels_init(&panels, black);
count = 0;
for (HMAP_ITER(&panels, iter))
count += 1;
aoc.answer = aprintf("%i", count);
aoc.solution = "2088";
for (HMAP_ITER(&panels, iter))
free(iter.link->key._p);
hmap_deinit(&panels);
}
void
part2(void)
{
struct hmap panels;
struct hmap_iter iter;
char *map;
hmap_init(&panels, 100, hmap_pos_hash, hmap_pos_keycmp,
&stdlib_strict_heap_allocator);
panels_init(&panels, white);
map = gen_map(&panels, NULL, 0);
aoc.answer = map;
aoc.solution = solmap;
for (HMAP_ITER(&panels, iter))
free(iter.link->key._p);
hmap_deinit(&panels);
}
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