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#include <stdio.h>
#include <stdlib.h>
#ifndef PART2
#define BUFFER 2020
#else
#define BUFFER 30000000
#endif
int
main(void)
{
/* Given starting numbers */
static unsigned int nums[BUFFER] = {0};
nums[6] = 1;
nums[19] = 2;
nums[0] = 3;
nums[5] = 4;
nums[7] = 5;
nums[13] = 6;
unsigned int temp, lnum = 1;
for (int i = 8; i <= BUFFER; i++) {
temp = lnum;
lnum = nums[lnum] ? i - 1 - nums[lnum] : 0;
nums[temp] = i - 1;
}
printf("%u\n", lnum);
return EXIT_SUCCESS;
}
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