44 lines
763 B
C
44 lines
763 B
C
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
FILE* input = fopen("../data/2017/1/input.txt", "r");
|
||
|
|
char c1, c2, first_char;
|
||
|
|
long total;
|
||
|
|
|
||
|
|
fread(&first_char, 1, 1, input);
|
||
|
|
c2 = first_char;
|
||
|
|
|
||
|
|
while (fread(&c1, 1, 1, input) > 0 && c1 != '\n') {
|
||
|
|
if (c1 == c2) {
|
||
|
|
total += c1 - '0';
|
||
|
|
}
|
||
|
|
c2 = c1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c2 == first_char) {
|
||
|
|
total += c2 - '0';
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("Part 1: %d\n", total);
|
||
|
|
|
||
|
|
int num_chars = ftell(input);
|
||
|
|
rewind(input);
|
||
|
|
total = 0;
|
||
|
|
|
||
|
|
char *buffer = malloc(num_chars);
|
||
|
|
fread(buffer, 1, num_chars, input);
|
||
|
|
|
||
|
|
for(int i = 0; i < num_chars / 2; i++) {
|
||
|
|
c1 = buffer[i];
|
||
|
|
c2 = buffer[i + (num_chars / 2)];
|
||
|
|
if (c1 == c2) {
|
||
|
|
total += c1 - '0';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
total <<= 1;
|
||
|
|
|
||
|
|
printf("Part 2: %d\n", total);
|
||
|
|
}
|