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/*
Challenge 014
Challenge #1
Write a script to generate Van Eck’s sequence starts with 0. For more
information, please check out wikipedia page. This challenge was proposed by
team member Andrezgz.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
void* check_mem(void* p) {
if (!p) {
fputs("Out of memory", stderr);
exit(EXIT_FAILURE);
}
return p;
}
int* van_eck_seq(int N) {
int* nums = check_mem(malloc(N * sizeof(int)));
nums[0] = nums[1] = 0;
for (int i = 2; i < N; i++) {
bool found = false;
for (int m = i-2; !found && m >= 0; m--) {
if (nums[m] == nums[i-1]) {
nums[i] = i-1-m;
found = true;
}
}
if (!found)
nums[i] = 0;
}
return nums;
}
int main(int argc, char* argv[]) {
if (argc != 2) {
fputs("usage: ch-1 N\n", stderr);
return EXIT_FAILURE;
}
int N = atoi(argv[1]);
int* nums = van_eck_seq(N);
const char* sep = "";
for (int i = 0; i < N; i++) {
printf("%s%d", sep, nums[i]);
sep = ", ";
}
printf("\n");
free(nums);
}
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