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#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include "input.h"
#define INPUT "input/03.txt"
#define INPUT_SIZE 12
void part1(struct input_str* input) {
int oneCount[INPUT_SIZE];
// TODO is that necessary ?
for(int k = 0; k < INPUT_SIZE; k++) {
oneCount[k] = 0;
}
for(size_t i = 0; i < input->line_count; i++) {
char* line = input->lines[i];
for(int j = 0; j < INPUT_SIZE; j++) {
if(line[j] == '1')
oneCount[j]++;
}
}
// null terminated string
char binary[INPUT_SIZE + 1];
for(int h = 0; h < INPUT_SIZE; h++) {
binary[h] = oneCount[h] > input->line_count / 2.0f ? '1' : '0';
}
binary[INPUT_SIZE] = '\0';
char* endp = NULL;
unsigned long gamma = strtoul(binary, &endp, 2);
unsigned long epsilon = gamma ^ 0xFFF;
if(*endp != '\0')
err(1, "erreur de parsing du gammaat");
printf("%ld\n", gamma * epsilon);
}
int main() {
// read input data
struct input_str input;
input_str_read(&input, INPUT);
// do stuff
part1(&input);
// cleanup & exit
input_str_free(&input);
return 0;
}
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