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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define MAX_NUMS 30000000
static int nums[MAX_NUMS] = { 0 };
int part_one(FILE *fp, int count)
{
long size = 0;
while (size < count)
if (fscanf(fp, "%d,", &nums[size++]) != 1)
break;
for (int i = size - 2; i < count - 1; i++) {
for (int j = i - 1; j >= 0; j--) {
if (nums[j] == nums[i]) {
nums[i + 1] = i - j;
break;
}
}
}
return nums[count - 1];
}
int main(int argc, char *argv[])
{
FILE *fp = fopen("input", "r");
if (!fp)
exit(EXIT_FAILURE);
clock_t tic = clock();
printf("%d\n", part_one(fp, 2020));
memset(nums, 0, 2020);
rewind(fp);
printf("%d\n", part_one(fp, 30000000));
clock_t toc = clock();
printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
fclose(fp);
return 0;
}
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