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-rw-r--r--03/a.c69
-rw-r--r--03/b.c106
-rw-r--r--03/input.txt323
3 files changed, 498 insertions, 0 deletions
diff --git a/03/a.c b/03/a.c
new file mode 100644
index 0000000..caa1d60
--- /dev/null
+++ b/03/a.c
@@ -0,0 +1,69 @@
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUF_SIZE 8192
+
+char buffer[BUF_SIZE];
+
+ssize_t read_to_buffer() {
+ ssize_t bytes = read(0, buffer, BUF_SIZE);
+ if (bytes < 0) {
+ printf("failed to read\n");
+ exit(1);
+ }
+ return bytes;
+}
+
+int tree(int position) {
+ if (buffer[position] == '.') {
+ return 0;
+ } else if (buffer[position] == '#') {
+ return 1;
+ } else {
+ printf("unknown character\n");
+ exit(1);
+ }
+}
+
+int file_position(int x, int y, int line_length) {
+ return (line_length + 2) * y + x;
+}
+
+int buffer_position(int x, int y, int line_length, int buffer_start) {
+ return file_position(x % line_length, y, line_length) - buffer_start;
+}
+
+int find_trees() {
+ int buffer_start = 0;
+ int line_length = 0;
+ int x = 0;
+ int y = 0;
+ ssize_t bytes = read_to_buffer();
+ int trees_hit = tree(0);
+
+ while (buffer[line_length] != '\r') {
+ line_length++;
+ }
+
+ int i = 2;
+ while (bytes) {
+ while (buffer_position(x + 3, y + 1, line_length, buffer_start) < bytes) {
+ y += 1;
+ x += 3;
+
+ trees_hit += tree(buffer_position(x, y, line_length, buffer_start));
+ }
+
+ buffer_start += bytes;
+ bytes = read_to_buffer();
+ }
+
+ return trees_hit;
+}
+
+int main() {
+ printf("%d\n", find_trees());
+}
diff --git a/03/b.c b/03/b.c
new file mode 100644
index 0000000..2f01601
--- /dev/null
+++ b/03/b.c
@@ -0,0 +1,106 @@
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUF_SIZE 8192
+#define NUM_SLOPES 5
+
+char buffer[BUF_SIZE];
+
+struct Pair {
+ int x;
+ int y;
+};
+
+struct Pair slopes[NUM_SLOPES];
+
+ssize_t read_to_buffer() {
+ ssize_t bytes = read(0, buffer, BUF_SIZE);
+ return bytes;
+}
+
+int tree(int position) {
+ if (buffer[position] == '.') {
+ return 0;
+ } else if (buffer[position] == '#') {
+ return 1;
+ }
+}
+
+int file_position(int x, int y, int line_length) {
+ return (line_length + 2) * y + x;
+}
+
+int buffer_position(struct Pair pos, int line_length, int buffer_start) {
+ return file_position(pos.x % line_length, pos.y, line_length) - buffer_start;
+}
+
+long long int find_trees() {
+ int trees_hit[NUM_SLOPES];
+ struct Pair next_check[NUM_SLOPES];
+ for (int i = 0; i < NUM_SLOPES; i++) {
+ trees_hit[i] = 0;
+ next_check[i].x = slopes[i].x;
+ next_check[i].y = slopes[i].y;
+ }
+
+ int y = 0;
+
+ ssize_t bytes = read_to_buffer();
+ int buffer_start = 0;
+ int line_length = 0;
+ while (buffer[line_length] != '\r') {
+ line_length++;
+ }
+
+ while (bytes) {
+ int checked = 5;
+ while (checked == 5) {
+ checked = 0;
+ for (int i = 0; i < NUM_SLOPES; i++) {
+ int position = buffer_position(next_check[i], line_length, buffer_start);
+ if (position < bytes && position >= 0 && y == next_check[i].y) {
+ trees_hit[i] += tree(position);
+
+ next_check[i].x += slopes[i].x;
+ next_check[i].x %= line_length;
+ next_check[i].y += slopes[i].y;
+
+ checked++;
+ } else if (position < 0 || y < next_check[i].y) {
+ checked++;
+ }
+ }
+
+ if (checked == NUM_SLOPES) {
+ y++;
+ }
+ }
+
+ buffer_start += bytes;
+ bytes = read_to_buffer();
+ }
+
+ long long int res = 1;
+ for (int i = 0; i < NUM_SLOPES; i++) {
+ res *= trees_hit[i];
+ }
+
+ return res;
+}
+
+int main() {
+ slopes[0].x = 1;
+ slopes[0].y = 1;
+ slopes[1].x = 3;
+ slopes[1].y = 1;
+ slopes[2].x = 5;
+ slopes[2].y = 1;
+ slopes[3].x = 7;
+ slopes[3].y = 1;
+ slopes[4].x = 1;
+ slopes[4].y = 2;
+ printf("%lld\n", find_trees());
+}
diff --git a/03/input.txt b/03/input.txt
new file mode 100644
index 0000000..104bc3d
--- /dev/null
+++ b/03/input.txt
@@ -0,0 +1,323 @@
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generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 04:16:46 +0000