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#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <string.h>
#include "input.h"
#define INPUT "input/03.txt"
#define INPUT_SIZE 12
void part1(char** input, size_t lineCount) {
int oneCount[INPUT_SIZE];
for(int k = 0; k < INPUT_SIZE; k++) {
oneCount[k] = 0;
}
for(size_t i = 0; i < lineCount; i++) {
char* line = input[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] > lineCount / 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() {
// lecture du fichier d'entree
FILE* file=fopen(INPUT,"r");
if(file == NULL)
err(1, "Le fichier %s n'existe pas\n", INPUT);
size_t lineCount = count_lines(file);
char** input = malloc(lineCount * sizeof(char*));
read_lines_as_string(file, input, lineCount);
// fermeture du fichier
fclose(file);
part1(input, lineCount);
free_strings(input, lineCount);
return 0;
}
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