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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define ABS(a) ((a) < 0 ? -(a) : (a))
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define COUNT(a) ((int)(sizeof(a) / sizeof 0 [a]))
#define FORLINE \
char *line = NULL; \
size_t len = 0; \
while (getline(&line, &len, fp) != EOF)
#define FREELINE \
if (line) \
free(line)
#define FORCH \
char ch = 0; \
while ((ch = fgetc(fp)) != EOF)
#define WHOLE \
fseek(fp, 0, SEEK_END); \
long fsize = ftell(fp); \
fseek(fp, 0, SEEK_SET); \
char *data = malloc(fsize + 1); \
fread(data, 1, fsize, fp);
#define SIZE 10
#define LINE (SIZE + 1)
#define BEYOND 42
#define JUSTFLASHED 33
#define INC(x, y) \
if ((x) >= 0 && (x) < SIZE && (y) >= 0 && (y) < SIZE) { \
if (data[(y)*LINE + (x)] == '9') { \
data[(y)*LINE + (x)] = BEYOND; \
} else if (data[(y)*LINE + (x)] >= '0') { \
inc++; \
data[(y)*LINE + (x)]++; \
} \
}
static int flash(char *data, int cnt)
{
int inc = 0;
for (int y = 0; y < SIZE; y++) {
for (int x = 0; x < SIZE; x++) {
if (data[y * LINE + x] == BEYOND) {
cnt++;
INC(x - 1, y - 1);
INC(x + 0, y - 1);
INC(x + 1, y - 1);
INC(x - 1, y + 0);
INC(x + 1, y + 0);
INC(x - 1, y + 1);
INC(x + 0, y + 1);
INC(x + 1, y + 1);
data[y * LINE + x] = JUSTFLASHED;
}
}
}
if (inc > 0)
return cnt + flash(data, 0);
return 0;
}
void print(char *data)
{
for (int y = 0; y < SIZE; y++) {
for (int x = 0; x < SIZE; x++)
if (data[y * LINE + x] == BEYOND)
printf(" ");
else if (data[y * LINE + x] == JUSTFLASHED)
printf("█");
else
printf("%c", data[y * LINE + x]);
printf("\n");
}
}
static int part_one(FILE *fp)
{
int res = 0;
WHOLE;
int inc = 0;
for (int i = 0; i < 101; i++) {
for (int y = 0; y < SIZE; y++)
for (int x = 0; x < SIZE; x++)
INC(x, y);
res += flash(data, 0);
for (int y = 0; y < SIZE; y++)
for (int x = 0; x < SIZE; x++)
if (data[y * LINE + x] == JUSTFLASHED)
data[y * LINE + x] = '0';
}
free(data);
return res + 2;
}
static int part_two(FILE *fp)
{
int res = 0;
WHOLE;
int inc = 0, cnt = 0;
for (res = 0; cnt != SIZE * SIZE - 1; res++) {
for (int y = 0; y < SIZE; y++)
for (int x = 0; x < SIZE; x++)
INC(x, y);
cnt = flash(data, 0);
for (int y = 0; y < SIZE; y++)
for (int x = 0; x < SIZE; x++)
if (data[y * LINE + x] == JUSTFLASHED)
data[y * LINE + x] = '0';
}
free(data);
return res;
}
int main(int argc, char *argv[])
{
(void)argc;
(void)argv;
FILE *fp = fopen("input", "r");
if (!fp)
exit(EXIT_FAILURE);
clock_t tic = clock();
printf("%d\n", part_one(fp));
rewind(fp);
printf("%d\n", part_two(fp));
clock_t toc = clock();
printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
fclose(fp);
return 0;
}
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