From 2689130b553c09b512bf9e76f8f3744b6368b8bd Mon Sep 17 00:00:00 2001
From: Florian Wetzel <florianwetzel@roam219063.roam.ohmhs.de>
Date: Tue, 9 Dec 2025 09:57:13 +0100
Subject: [PATCH] numbers.c bearbeitet

---
 numbers.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/numbers.c b/numbers.c
index f59d9a2..ec96255 100644
--- a/numbers.c
+++ b/numbers.c
@@ -14,13 +14,106 @@
 // Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
 // Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
 // creating random numbers.
+
+static int compareUInt(const void *a, const void *b)
+{
+    unsigned int A = *(unsigned int*)a;
+    unsigned int B = *(unsigned int*)b;
+    if (A < B) return -1;
+    if (A > B) return 1;
+    return 0;
+}
+// Sortiervergleich für qsort
+int compareQsort(const void *a, const void *b)
+{
+    unsigned int A = *(const unsigned int*)a;
+    unsigned int B = *(const unsigned int*)b;
+    if (A < B) return -1;
+    if (A > B) return +1;
+    return 0;
+}
+
 unsigned int *createNumbers(unsigned int len)
 {
+    if (len < 2) return NULL;
 
+    srand((unsigned int)time(NULL));
+
+    // Speicher für das Array
+    unsigned int *numbers = malloc(sizeof(unsigned int) * len);
+    if (!numbers) return NULL;
+
+    TreeNode *root = NULL;        // Baumwurzel
+    unsigned int value;
+    int isDuplicate;
+
+    //Array mit eindeutigen Zufallszahlen füllen
+    for (unsigned int i = 0; i < len; i++)
+    {
+        while (1)
+        {
+            value = (rand() % (2 * len)) + 1; // Zufallszahl 1..2*len
+            isDuplicate = 0;
+
+            TreeNode *newRoot = addToTree(
+                root,
+                &value,
+                sizeof(unsigned int),
+                compareUInt,
+                &isDuplicate
+            );
+
+            if (!isDuplicate)
+            {
+                // Neue Zahl - akzeptieren
+                root = newRoot;
+                numbers[i] = value;
+                break;
+            }
+            // Sonst neue Zahl generieren
+        }
+    }
+
+    //genau eine Zufallszahl duplizieren
+    unsigned int idx1 = rand() % len;
+    unsigned int idx2 = rand() % len;
+
+    while (idx2 == idx1)
+        idx2 = rand() % len;
+
+    numbers[idx2] = numbers[idx1];
+
+    // Baum wieder freigeben
+    clearTree(root);
+
+    return numbers;
 }
 
 // Returns only the only number in numbers which is present twice. Returns zero on errors.
 unsigned int getDuplicate(const unsigned int numbers[], unsigned int len)
 {
+    if (!numbers || len < 2) return 0;
 
+    unsigned int *copy = malloc(len * sizeof(unsigned int));
+    if (!copy) return 0;
+
+    // Array kopieren
+    memcpy(copy, numbers, len * sizeof(unsigned int));
+
+    // Sortieren
+    qsort(copy, len, sizeof(unsigned int), compareQsort);
+
+    // Doppelte Zahl finden
+    unsigned int duplicate = 0;
+    for (unsigned int i = 0; i < len - 1; i++)
+    {
+        if (copy[i] == copy[i + 1])
+        {
+            duplicate = copy[i];
+            break;
+        }
+    }
+
+    free(copy);
+    return duplicate;
 }
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