From 51473b135259574f22da4f8cdf4ce815d80df34d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dobos=20=C3=81d=C3=A1m?= <dobi@pop-os.localdomain>
Date: Sat, 17 Dec 2022 23:59:47 +0100
Subject: [PATCH] Day13

---
 day13/input.txt | 450 ++++++++++++++++++++++++++++++++++++++++++++++++
 day13/order     | Bin 0 -> 16400 bytes
 day13/order.c   | 245 ++++++++++++++++++++++++++
 3 files changed, 695 insertions(+)
 create mode 100644 day13/input.txt
 create mode 100755 day13/order
 create mode 100644 day13/order.c

diff --git a/day13/input.txt b/day13/input.txt
new file mode 100644
index 0000000..4b8be08
--- /dev/null
+++ b/day13/input.txt
@@ -0,0 +1,450 @@
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+[[[4,10,[8,1],10],[[],[10,8],[6,7,2],6,3],3,[[],7,5]],[[[5,6],0,6,9,5],[[9,6,9],4,[8,2],0,7]]]
+[[],[6,7],[8,[10,[0,6,4,0,9],[],[]],6,[[2,1,2,6],[10,10,7,3,4],6,[],[8]]]]
+
+[[[[5,3,7,3],7,[3],4,[5]],10,9,[1,2,6]],[9],[[2,10,[9,2],[10,1,7]],[9,0,[4,3,6,0,4],2,[4,4,9]]]]
+[[[[],[3,4]],[]]]
+
+[[[[6,1,9],6,3],0,10,9,5],[]]
+[[[[0,7,6,5],8,[],[2,6,6,1,10],[10,9]],5,5,4],[4,[[8],[7]],8,10],[]]
+
+[[1,3,2],[]]
+[[[[10,3],9,[10,1]],[4,4,[0,1,6,1,4]]]]
+
+[[[],[3],[[7],5,7],[[4,2],6,[]]],[[[1,3,3,6],[1]]],[1,0,6,[[10,5,0,7]]],[]]
+[[8,0],[3,3,[[9,10,6],[0,2,8],5],[4,9,[],1],[10,[8],8]],[4,5]]
+
+[[3,[[9,5,7,7],1,10,5],[[8,10,2,5,5],5,[2,7,6],[8,2,3,10]],[[],[10],2]],[8,1]]
+[[[[9,5,8],[7]]],[7,[10,6,[1,9,3]],[[0,8,7,1],7,[0,6,8,1,8]],4],[[2,7],[[8,7,10]]]]
+
+[[[],[],[[4]],[[9,9,0,8]],4],[[[8,0,10,10,9],2,5],[[8,3,4,1,3],[9,7],2,3],[[7,4,1],[7,5,9]]],[],[10,6],[]]
+[[2],[[8],[]],[]]
+
+[[2,[2,4]],[]]
+[[[8,[1,0]],2,7],[3,[7,[6,8,10,8],3,[3,7,6,4],[5,4,6]],[5]],[1,[]],[],[[0,[1,3,6,8,8]],2,[[5,2,2,0],[9,5],0],[],[4]]]
+
diff --git a/day13/order b/day13/order
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diff --git a/day13/order.c b/day13/order.c
new file mode 100644
index 0000000..85cbdd1
--- /dev/null
+++ b/day13/order.c
@@ -0,0 +1,245 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER_SIZE 256
+#define MAX_MEMBERS 64
+#define MAX_PACKETS 512
+
+enum NodeType {
+    NUMBER,
+    LIST
+};
+
+enum orderType {
+    INORDER,
+    OUTOFORDER,
+    INDECISIVE
+};
+
+typedef struct node {
+    enum NodeType type;
+    struct node *members[MAX_MEMBERS];
+    int member_count;
+    long value;
+    int marker;
+} NODE;
+
+void destructNode(NODE*);
+long yeetList(NODE*, char*);
+enum orderType inOrder(NODE*, NODE*);
+void quicksort(NODE *[], int, int);
+void swap(NODE *[], int, int);
+
+int main() {
+    char buf[BUFFER_SIZE], *p, c;
+    memset(buf, 0, BUFFER_SIZE);
+    p = buf;
+
+    int isLeft = 1, iter = 0, sum = 0;
+    NODE *left, *right, *curr;
+    NODE *packets[MAX_PACKETS];
+    int packet_count = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c == '\n') {
+            if (buf[0] == '\n') {
+                // Empty lines don't matter
+                memset(buf, 0, BUFFER_SIZE);
+                p = buf;
+                continue;
+            }
+
+            // The root Node is always a list
+            if (isLeft) {
+                left = (NODE*)malloc(sizeof(NODE));
+                memset(left, 0, sizeof(NODE));
+                left->type = LIST;
+                left->marker = 0;
+                curr = left;
+                isLeft = 0;
+            } else {
+                right = (NODE*)malloc(sizeof(NODE));
+                memset(right, 0, sizeof(NODE));
+                right->type = LIST;
+                right->marker = 0;
+                curr = right;
+                isLeft = 1;
+            }
+
+
+            // Parse node
+            yeetList(curr, buf+1);
+            packets[packet_count] = curr;
+            packet_count++;
+
+            if (isLeft == 1) {
+                iter++;
+                // Compare
+
+                if (inOrder(left, right) == INORDER) {
+                    sum += iter;
+                }
+            }
+
+            memset(buf, 0, BUFFER_SIZE);
+            p = buf;
+        }
+    }
+    printf("%i\n", sum);
+
+    // Add the two extra packets
+    curr = (NODE*)malloc(sizeof(NODE));
+    memset(curr, 0, sizeof(NODE));
+    curr->type = LIST;
+    curr->marker = 1;
+    yeetList(curr, "[2]]");
+    packets[packet_count] = curr;
+    packet_count++;
+    curr = (NODE*)malloc(sizeof(NODE));
+    memset(curr, 0, sizeof(NODE));
+    curr->type = LIST;
+    curr->marker = 1;
+    yeetList(curr, "[6]]");
+    packets[packet_count] = curr;
+    packet_count++;
+
+    // Quicksort packets
+    quicksort(packets, 0, packet_count - 1);
+    int product = 1;
+
+    for (int i = 0; i < packet_count; i++) {
+        if (packets[i]->marker) {
+            product *= i + 1;
+        }
+        // Cleanup
+        destructNode(packets[i]);
+        free(packets[i]);
+    }
+
+    printf("%i\n", product);
+}
+
+void destructNode(NODE* node) {
+    if (node->type == LIST) {
+        for (int i = 0; i < node->member_count; i++) {
+            destructNode(node->members[i]);
+            free(node->members[i]);
+        }
+    }
+}
+
+long yeetList(NODE* parent, char* p) {
+    long tmp;
+    char *q = p;
+    while(*q != ']') {
+        // New list
+        if (*q == '[') {
+            NODE *newNode = (NODE*)malloc(sizeof(NODE));
+            memset(newNode, 0, sizeof(NODE));
+            newNode->type = LIST;
+            parent->members[parent->member_count] = newNode;
+            parent->member_count++;
+            tmp = yeetList(newNode, q+1);
+            // Jump to the end
+            q += tmp + 2;
+            // Move one up if it is ','
+            if (*q == ',') {
+                q++;
+            }
+        } else {
+            // Read next int
+            sscanf(q, "%li", &tmp);
+            NODE *newNode = (NODE*)malloc(sizeof(NODE));
+            memset(newNode, 0, sizeof(NODE));
+            newNode->type = NUMBER;
+            newNode->value = tmp;
+            parent->members[parent->member_count] = newNode;
+            parent->member_count++;
+
+            // Move pointer to the next ',' or ']'
+            while (*q != ',' && *q != ']') { q++; }
+            // Move one up if it is ','
+            if (*q == ',') {
+                q++;
+            }
+        }
+    }
+    return q-p;
+}
+
+enum orderType inOrder(NODE* left, NODE* right) {
+    // If both are numbers
+    if (left->type == NUMBER && right->type == NUMBER) {
+        if (left->value < right->value) {
+            return INORDER;
+        } else if (left->value == right->value) {
+            return INDECISIVE;
+        } else {
+            return OUTOFORDER;
+        }
+    }
+
+    // If both are lists
+    if (left->type == LIST && right->type == LIST) {
+        for (int i = 0; i < left->member_count; i++) {
+            // Right ran out first
+            if (i == right->member_count) {
+                return OUTOFORDER;
+            }
+            enum orderType result = inOrder(left->members[i], right->members[i]);
+            if (result == INORDER || result == OUTOFORDER) return result;
+        }
+        // Left ran out first
+        if (right->member_count > left->member_count) return INORDER;
+
+        return INDECISIVE;
+    }
+
+    NODE tmp;
+    // If left is a number, right is a list
+    if (left->type == NUMBER && right->type == LIST) {
+        tmp.type = LIST;
+        tmp.members[0] = left;
+        tmp.member_count = 1;
+
+        return inOrder(&tmp, right);
+    }
+
+    // Left is a list, right is a number
+    tmp.type = LIST;
+    tmp.members[0] = right;
+    tmp.member_count = 1;
+
+    return inOrder(left, &tmp);
+}
+
+void quicksort(NODE *packets[], int left, int right) {
+    int last;
+
+    if (left >= right) {
+        return;
+    }
+
+    swap(packets, left, (left+right)/2);
+    last = left;
+
+    for (int i = left+1; i <= right; i++) {
+        if (inOrder(packets[left], packets[i]) == OUTOFORDER) {
+            swap(packets, ++last, i);
+        }
+    }
+
+    swap(packets, left, last);
+    quicksort(packets, left, last - 1);
+    quicksort(packets, last + 1, right);
+}
+
+void swap(NODE *packets[], int i, int j) {
+    NODE *tmp;
+
+    tmp = packets[i];
+    packets[i] = packets[j];
+    packets[j] = tmp;
+}