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#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <err.h>
#include "input.h"
#define INPUT "input/06.txt"
#define EXPECTED1 1598L
#define EXPECTED2 2414L
void find_marker(char* input, size_t marker_size, size_t expected) {
size_t pos;
size_t pos_max = strlen(input);
if(marker_size >= pos_max) {
err(2, "input is too short");
return;
}
size_t marker_size_loop = marker_size - 1;
for(pos = marker_size_loop; pos < pos_max; pos++) {
bool is_marker = true;
for(size_t i = pos; i > pos-marker_size_loop; i--) {
for(size_t j = i-1; j >= pos-marker_size_loop; j--) {
is_marker &= input[i] != input[j];
if(!is_marker)
break;
}
if(!is_marker)
break;
}
if(is_marker)
break;
}
pos++;
CHECK(pos, expected)
}
int main() {
// read input
struct input_str input;
input_str_read(&input, INPUT);
// do stuff
find_marker(input.lines[0], 4, EXPECTED1);
find_marker(input.lines[0], 14, EXPECTED2);
// cleanup & exit
input_str_free(&input);
return 0;
}
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