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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#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 long iterate(char *fish, long cnt)
{
/* for (int i = 0; i < cnt; i++) */
/* printf("%d,", fish[i]); */
/* printf("\n"); */
long ret = cnt;
for (long i = 0; i < cnt; i++) {
if (fish[i] == 0) {
fish[i] = 6;
fish[ret++] = 8;
} else {
fish[i]--;
}
}
return ret;
}
static long solve(FILE *fp)
{
char *fish = malloc(20000000000 * sizeof(char));
long cnt = 0;
char ch;
while (fscanf(fp, "%d%c", (int *)&fish[cnt++], &ch) != EOF && (ch == ',' || ch == '\n'))
;
cnt -= 1; // newline
for (int i = 0; i < 256; i++)
cnt = iterate(fish, cnt);
free(fish);
return cnt;
}
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("%lu\n", solve(fp));
clock_t toc = clock();
printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
fclose(fp);
return 0;
}
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