solved 11a

11/'

@@ -0,0 +1,92 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<string.h>
+#include<stdbool.h>
+
+struct list {
+	int num;
+	struct list *next;
+};
+
+bool even_digits(int x)
+{
+	int i = 0;
+	while (x /= 10)
+		i++;
+	return i % 2;
+}
+
+void split_stone(struct list *stones) {
+	int digits = 0;
+	int x = stones->num;
+	while (x /= 10)
+		digits++;
+
+	int a = stones->num;
+	int b = 0;
+	for (int i = 0; i < digits; i++) {
+		b = b * 10 + a % 10;
+		a /= 10;
+	}
+
+	struct list *tmp = stones->next;
+	stones->next = malloc(sizeof(struct list));
+	stones->num = a;
+	stones->next->num = b;
+	stones->next->next = tmp;
+}
+
+int main ()
+{
+	// figure out data dimensions
+	FILE *input = fopen("./inputDemo", "r");
+	unsigned int tmp;
+	unsigned int array[10];
+	for (int i = 0; i < 10; i++)
+		array[i] = -1;
+	for (int i = 0; fscanf(input, "%d", &tmp) == 1; i++) {
+		array[i] = tmp;
+	}
+	fclose(input);
+
+	// put stones into list
+	struct list *stones = malloc(sizeof(struct list));
+	stones->num = array[0];
+	stones->next = NULL;
+	struct list *current = stones;
+	for (int i = 1; array[i] != -1; i++) {
+		while (current->next != NULL)
+			current = current->next;
+		current->next = malloc(sizeof(struct list));
+		current->next->next = NULL;
+		current->next->num = array[i];
+	}
+
+	// loop through list
+	for (int i = 0; i < 6; i++) {
+		current = stones;
+		while (current) {
+			// 0 => make 1
+			if (current->num == 0)
+				current->num = 1;
+			// even number of digits => split, fix list shit
+			else if (even_digits(current->num))
+				split_stone(current);
+			// (point first split onto second split, second split onto old ptr)
+			// else => mult 2024
+			else
+				current->num *= 2024;
+
+			current = current->next;
+		}
+	}
+	current = stones;
+	int sum = 0;
+	printf("Stones: ");
+	while (current) {
+		printf("%d ", current->num);
+		sum++;
+		current = current->next;
+	}
+	printf("%d\n", sum);
+}

11/input

@@ -0,0 +1 @@
+510613 358 84 40702 4373582 2 0 1584

11/inputDemo

@@ -0,0 +1 @@
+125 17

11/main.c

@@ -0,0 +1,116 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<string.h>
+#include<stdbool.h>
+
+struct list {
+	unsigned long int num;
+	struct list *next;
+};
+
+bool even_digits(unsigned long int x)
+{
+	int i = 0;
+	while (x /= 10)
+		i++;
+	return i % 2;
+}
+// power! x to the y!
+int pow(int x, int y)
+{
+	int ans = 1;
+	for (int i = 0; i < y; i++) ans *= x;
+	return ans;
+}
+void split_stone(struct list *stones) {
+	int digits = 1;
+	unsigned long int x = stones->num;
+	while (x /= 10)
+		digits++;
+
+	unsigned long int a = stones->num;
+	int b = 0;
+	for (int i = 0; i < digits / 2; i++) {
+		b += (a % 10) * pow(10, i);
+		a /= 10;
+	}
+
+	struct list *tmp = stones->next;
+	stones->next = malloc(sizeof(struct list));
+	stones->num = a;
+	stones->next->num = b;
+	stones->next->next = tmp;
+}
+
+int main ()
+{
+	// figure out data dimensions
+	FILE *input = fopen("./input", "r");
+	unsigned int tmp;
+	unsigned int array[10];
+	for (int i = 0; i < 10; i++)
+		array[i] = -1;
+	for (int i = 0; fscanf(input, "%d", &tmp) == 1; i++) {
+		array[i] = tmp;
+	}
+	fclose(input);
+
+	// put stones into list
+	struct list *stones = malloc(sizeof(struct list));
+	stones->num = array[0];
+	stones->next = NULL;
+	struct list *current = stones;
+	for (int i = 1; array[i] != -1; i++) {
+		while (current->next != NULL)
+			current = current->next;
+		current->next = malloc(sizeof(struct list));
+		current->next->next = NULL;
+		current->next->num = array[i];
+	}
+
+	// loop through list
+	for (int i = 0; i < 75; i++) {
+		current = stones;
+		bool last = false;
+		while (current) {
+			if (current->next == NULL)
+				last = true;
+			// 0 => make 1
+			if (current->num == 0)
+				current->num = 1;
+			// even number of digits => split, fix list shit
+			else if (even_digits(current->num)) {
+				split_stone(current);
+				current = current->next;
+			}
+			// (point first split onto second split, second split onto old ptr)
+			// else => mult 2024
+			else
+				current->num *= 2024;
+
+			current = current->next;
+			if (last)
+				break;
+		}
+		struct list *tmp = stones;
+		/*
+		int sum = 0;
+		printf("%d blinks: \n", i + 1);
+		while (tmp) {
+			printf("%lu ", tmp->num);
+			sum++;
+			tmp = tmp->next;
+		}
+		printf("\ntotal: %d\n", sum);
+		*/
+	}
+	current = stones;
+	unsigned long int sum = 0;
+	printf("Stones: ");
+	while (current) {
+		printf("%lu ", current->num);
+		sum++;
+		current = current->next;
+	}
+	printf("\ntotal: %d\n", sum);
+}