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#include <stdio.h>
#include <stdlib.h>
#include <string.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); \
data[fsize] = 0;
/* data[fsize--] = 0 */
static int part_one(FILE *fp)
{
int res = 0;
char grid[200][200] = { 0 };
char buf[200][200] = { 0 };
int line_cnt = 0;
FORLINE
strcpy(grid[line_cnt++], line);
FREELINE;
memcpy(buf, grid, sizeof(buf));
while (1) {
res++;
int moves = 0;
// East
for (int y = 0; y < line_cnt; y++) {
for (int x = 0; x < COUNT(grid[y]); x++) {
if (grid[y][x] != '>')
continue;
if (grid[y][x + 1] == '\n') { // End
if (grid[y][0] == '.') {
buf[y][x] = '.';
buf[y][0] = '>';
moves++;
}
} else if (grid[y][x + 1] == '.') {
buf[y][x] = '.';
buf[y][x + 1] = '>';
moves++;
}
}
}
// South
memcpy(grid, buf, sizeof(grid));
for (int y = 0; y < line_cnt; y++) {
for (int x = 0; x < COUNT(grid[y]); x++) {
if (grid[y][x] != 'v')
continue;
if (grid[y + 1][x] == 0) { // End
if (grid[0][x] == '.') {
buf[y][x] = '.';
buf[0][x] = 'v';
moves++;
}
} else if (grid[y + 1][x] == '.') {
buf[y][x] = '.';
buf[y + 1][x] = 'v';
moves++;
}
}
}
if (!moves)
break;
memcpy(grid, buf, sizeof(grid));
}
return res;
}
static int part_two(FILE *fp)
{
int res = 42;
(void)fp;
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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