From 416f44ae748137c160afdc85643c0b4e22fdb10a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Yannik=20Baumg=C3=A4rtner?=
 <yannikbaumgartner@MacBook-Pro-von-Yannik.fritz.box>
Date: Tue, 9 Dec 2025 08:00:32 +0100
Subject: [PATCH] Endlich fertig

---
 bintree.c                                     |  87 ++++++++++++++--
 bintree.o                                     | Bin 0 -> 5840 bytes
 doble                                         | Bin 0 -> 18384 bytes
 doble_initial                                 | Bin 0 -> 14936 bytes
 highscore.o                                   | Bin 0 -> 10088 bytes
 highscores.txt                                |  11 +-
 main.o                                        | Bin 0 -> 5440 bytes
 makefile                                      |  32 +++++-
 numbers.c                                     |  95 +++++++++++++++++-
 numbers.o                                     | Bin 0 -> 5240 bytes
 stack.c                                       |  30 ++++--
 stack.h                                       |   7 +-
 stack.o                                       | Bin 0 -> 3320 bytes
 test_bintree                                  | Bin 0 -> 10768 bytes
 test_bintree.c                                |  48 +++++++++
 test_bintree.dSYM/Contents/Info.plist         |  20 ++++
 .../Contents/Resources/DWARF/test_bintree     | Bin 0 -> 13529 bytes
 .../Relocations/x86_64/test_bintree.yml       |  20 ++++
 test_numbers                                  | Bin 0 -> 15552 bytes
 test_numbers.c                                |  41 ++++++++
 test_numbers.dSYM/Contents/Info.plist         |  20 ++++
 .../Contents/Resources/DWARF/test_numbers     | Bin 0 -> 14784 bytes
 .../Relocations/x86_64/test_numbers.yml       |  24 +++++
 test_stack                                    | Bin 0 -> 9632 bytes
 test_stack.c                                  |  44 ++++++++
 test_stack.dSYM/Contents/Info.plist           |  20 ++++
 .../Contents/Resources/DWARF/test_stack       | Bin 0 -> 10586 bytes
 .../Relocations/x86_64/test_stack.yml         |  12 +++
 timer.o                                       | Bin 0 -> 3912 bytes
 29 files changed, 486 insertions(+), 25 deletions(-)
 create mode 100644 bintree.o
 create mode 100755 doble
 create mode 100755 doble_initial
 create mode 100644 highscore.o
 create mode 100644 main.o
 create mode 100644 numbers.o
 create mode 100644 stack.o
 create mode 100755 test_bintree
 create mode 100644 test_bintree.c
 create mode 100644 test_bintree.dSYM/Contents/Info.plist
 create mode 100644 test_bintree.dSYM/Contents/Resources/DWARF/test_bintree
 create mode 100644 test_bintree.dSYM/Contents/Resources/Relocations/x86_64/test_bintree.yml
 create mode 100755 test_numbers
 create mode 100644 test_numbers.c
 create mode 100644 test_numbers.dSYM/Contents/Info.plist
 create mode 100644 test_numbers.dSYM/Contents/Resources/DWARF/test_numbers
 create mode 100644 test_numbers.dSYM/Contents/Resources/Relocations/x86_64/test_numbers.yml
 create mode 100755 test_stack
 create mode 100644 test_stack.c
 create mode 100644 test_stack.dSYM/Contents/Info.plist
 create mode 100644 test_stack.dSYM/Contents/Resources/DWARF/test_stack
 create mode 100644 test_stack.dSYM/Contents/Resources/Relocations/x86_64/test_stack.yml
 create mode 100644 timer.o

diff --git a/bintree.c b/bintree.c
index 5cf82a9..668c164 100644
--- a/bintree.c
+++ b/bintree.c
@@ -1,18 +1,65 @@
+#include <stdlib.h>
 #include <string.h>
 #include "stack.h"
 #include "bintree.h"
 
-//TODO: binären Suchbaum implementieren
-/*  * `addToTree`: fügt ein neues Element in den Baum ein (rekursiv),
-    * `clearTree`: gibt den gesamten Baum frei (rekursiv),
-    * `treeSize`: zählt die Knoten im Baum (rekursiv),
-    * `nextTreeData`: Traversierung mit Hilfe des zuvor implementierten Stacks. */
+// internal helper to push node and all its left descendants onto iterator stack
+static void bintree_pushLefts(StackNode **iterStackPtr, TreeNode *n)
+{
+    while(n != NULL)
+    {
+        *iterStackPtr = push(*iterStackPtr, n);
+        n = n->left;
+    }
+}
 
 // Adds a copy of data's pointer destination to the tree using compareFct for ordering. Accepts duplicates
 // if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
 {
+    if(isDuplicate != NULL)
+        *isDuplicate = 0;
 
+    if(root == NULL)
+    {
+        TreeNode *node = (TreeNode *)malloc(sizeof(TreeNode));
+        if(node == NULL)
+            return NULL;
+        node->data = malloc(dataSize);
+        if(node->data == NULL)
+        {
+            free(node);
+            return NULL;
+        }
+        memcpy(node->data, data, dataSize);
+        node->left = node->right = NULL;
+        return node;
+    }
+
+    int cmp = compareFct(data, root->data);
+    if(cmp < 0)
+    {
+        root->left = addToTree(root->left, data, dataSize, compareFct, isDuplicate);
+    }
+    else if(cmp > 0)
+    {
+        root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
+    }
+    else // equal
+    {
+        if(isDuplicate != NULL)
+        {
+            *isDuplicate = 1;
+            // do not insert duplicate
+        }
+        else
+        {
+            // duplicates allowed -> insert into right subtree
+            root->right = addToTree(root->right, data, dataSize, compareFct, isDuplicate);
+        }
+    }
+
+    return root;
 }
 
 // Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.
@@ -20,17 +67,45 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 // push the top node and push all its left nodes.
 void *nextTreeData(TreeNode *root)
 {
+    static StackNode *iterStack = NULL;
 
+    // If a new tree root is provided -> reset iterator
+    if(root != NULL)
+    {
+        clearStack(iterStack);
+        iterStack = NULL;
+        bintree_pushLefts(&iterStack, root);
+    }
+
+    if(iterStack == NULL)
+        return NULL;
+
+    TreeNode *node = (TreeNode *)top(iterStack);
+    iterStack = pop(iterStack);
+
+    if(node->right != NULL)
+        bintree_pushLefts(&iterStack, node->right);
+
+    return node->data;
 }
 
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
+    if(root == NULL)
+        return;
 
+    clearTree(root->left);
+    clearTree(root->right);
+
+    free(root->data);
+    free(root);
 }
 
 // Returns the number of entries in the tree given by root.
 unsigned int treeSize(const TreeNode *root)
 {
-
+    if(root == NULL)
+        return 0;
+    return 1 + treeSize(root->left) + treeSize(root->right);
 }
\ No newline at end of file
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diff --git a/doble_initial b/doble_initial
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diff --git a/highscores.txt b/highscores.txt
index 4edd5a7..7f7e944 100644
--- a/highscores.txt
+++ b/highscores.txt
@@ -1 +1,10 @@
-player1;3999
+Lena;19811
+Lena;19702
+player_name;9981
+Lena;9980
+Lena;9978
+Lena;9978
+Lena;9976
+Lena;9975
+Lena;9971
+Lena;9965
diff --git a/main.o b/main.o
new file mode 100644
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HcmV?d00001

diff --git a/makefile b/makefile
index 1f15f75..c707aae 100644
--- a/makefile
+++ b/makefile
@@ -29,14 +29,38 @@ program_obj_files = stack.o bintree.o numbers.o timer.o highscore.o
 doble : main.o $(program_obj_files)
 	$(CC) $(FLAGS) $^ -o doble
 
-$(program_obj_filesobj_files): %.o: %.c
-	$(CC) -c $(FLAGS) $^ -o $@
+# pattern rule to build .o from .c
+%.o: %.c
+	$(CC) -c $(FLAGS) $< -o $@
 
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests:
-	echo "needs to be implemented"
+unitTests: test_stack test_numbers test_bintree
+	@total=0; passed=0; failed=0; \
+	for t in test_stack test_numbers test_bintree; do \
+		total=$$((total+1)); \
+		printf "Running %s...\n" "$$t"; \
+		./$$t; rc=$$?; \
+		if [ $$rc -eq 0 ]; then \
+			printf "%s: PASS\n\n" "$$t"; \
+			passed=$$((passed+1)); \
+		else \
+			printf "%s: FAIL (exit %d)\n\n" "$$t" $$rc; \
+			failed=$$((failed+1)); \
+		fi; \
+	done; \
+	printf "Summary: %d tests run, %d passed, %d failed\n" $$total $$passed $$failed; \
+	exit $$failed
+
+test_stack: test_stack.c stack.c
+	$(CC) $(FLAGS) test_stack.c stack.c -o test_stack
+
+test_numbers: test_numbers.c numbers.c bintree.c stack.c
+	$(CC) $(FLAGS) test_numbers.c numbers.c bintree.c stack.c -o test_numbers
+
+test_bintree: test_bintree.c bintree.c stack.c
+	$(CC) $(FLAGS) test_bintree.c bintree.c stack.c -o test_bintree
 
 # --------------------------
 # Clean
diff --git a/numbers.c b/numbers.c
index f59d9a2..f45d131 100644
--- a/numbers.c
+++ b/numbers.c
@@ -5,22 +5,107 @@
 #include "numbers.h"
 #include "bintree.h"
 
-//TODO: getDuplicate und createNumbers implementieren
-/*  *   * Erzeugen eines Arrays mit der vom Nutzer eingegebenen Anzahl an Zufallszahlen.
-  * Sicherstellen, dass beim Befüllen keine Duplikate entstehen.
-  * Duplizieren eines zufälligen Eintrags im Array.
-  * in `getDuplicate()`: Sortieren des Arrays und Erkennen der doppelten Zahl durch Vergleich benachbarter Elemente. */
+// helper comparator for unsigned int for bintree
+static int compareUInt(const void *a, const void *b)
+{
+    unsigned int va = *(const unsigned int *)a;
+    unsigned int vb = *(const unsigned int *)b;
+    if(va < vb) return -1;
+    if(va > vb) return 1;
+    return 0;
+}
+
+// comparator for qsort (unsigned int)
+static int qsort_uint_cmp(const void *a, const void *b)
+{
+    unsigned int va = *(const unsigned int *)a;
+    unsigned int vb = *(const unsigned int *)b;
+    if(va < vb) return -1;
+    if(va > vb) return 1;
+    return 0;
+}
 
 // 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.
 unsigned int *createNumbers(unsigned int len)
 {
+    if(len < 2)
+        return NULL;
 
+    unsigned int *numbers = (unsigned int *)malloc(sizeof(unsigned int) * len);
+    if(numbers == NULL)
+        return NULL;
+
+    // seed once
+    srand((unsigned int)time(NULL));
+
+    TreeNode *root = NULL;
+    unsigned int range = 2 * len;
+    // create len-1 unique numbers
+    for(unsigned int i = 0; i < len - 1; i++)
+    {
+        unsigned int val;
+        int isDup = 0;
+        // try until a unique number is inserted
+        do
+        {
+            val = (unsigned int)(rand() % range) + 1; // [1..2*len]
+            root = addToTree(root, &val, sizeof(val), compareUInt, &isDup);
+            // if addToTree returned NULL due to allocation failure, cleanup and return NULL
+            if(root == NULL && isDup == 0)
+            {
+                free(numbers);
+                clearTree(root);
+                return NULL;
+            }
+        } while(isDup);
+        numbers[i] = val;
+    }
+
+    // duplicate one existing random entry
+    unsigned int idx = (unsigned int)(rand() % (len - 1));
+    numbers[len - 1] = numbers[idx];
+
+    // shuffle array (Fisher-Yates)
+    for(unsigned int i = len - 1; i > 0; i--)
+    {
+        unsigned int j = (unsigned int)(rand() % (i + 1));
+        unsigned int tmp = numbers[i];
+        numbers[i] = numbers[j];
+        numbers[j] = tmp;
+    }
+
+    // free tree resources
+    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 == NULL || len < 2)
+        return 0;
 
+    // make a copy so original array order is not modified by caller expectation
+    unsigned int *copy = (unsigned int *)malloc(sizeof(unsigned int) * len);
+    if(copy == NULL)
+        return 0;
+
+    memcpy(copy, numbers, sizeof(unsigned int) * len);
+
+    qsort(copy, len, sizeof(unsigned int), qsort_uint_cmp);
+
+    unsigned int result = 0;
+    for(unsigned int i = 0; i + 1 < len; i++)
+    {
+        if(copy[i] == copy[i+1])
+        {
+            result = copy[i];
+            break;
+        }
+    }
+
+    free(copy);
+    return result;
 }
\ No newline at end of file
diff --git a/numbers.o b/numbers.o
new file mode 100644
index 0000000000000000000000000000000000000000..e87e9fed808d452a7702ef153005d1d6694eeb9e
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/stack.c b/stack.c
index e3a90d4..0472a36 100644
--- a/stack.c
+++ b/stack.c
@@ -1,33 +1,47 @@
 #include <stdlib.h>
 #include "stack.h"
 
-//TODO: grundlegende Stackfunktionen implementieren:
-/*  * `push`: legt ein Element oben auf den Stack,
-    * `pop`: entfernt das oberste Element,
-    * `top`: liefert das oberste Element zurück,
-    * `clearStack`: gibt den gesamten Speicher frei. */
-
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data)
 {
+    StackNode *node = (StackNode *)malloc(sizeof(StackNode));
+    if(node == NULL)
+        return stack; // allocation failed -> return unchanged stack
 
+    node->data = data;
+    node->next = stack;
+    return node;
 }
 
 // Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be
 // freed by caller.)
 StackNode *pop(StackNode *stack)
 {
+    if(stack == NULL)
+        return NULL;
 
+    StackNode *next = stack->next;
+    // Do NOT free stack->data here; caller owns the pointed data
+    free(stack);
+    return next;
 }
 
 // Returns the data of the top element.
 void *top(StackNode *stack)
 {
-
+    if(stack == NULL)
+        return NULL;
+    return stack->data;
 }
 
 // Clears stack and releases all memory.
 void clearStack(StackNode *stack)
 {
-
+    while(stack != NULL)
+    {
+        StackNode *next = stack->next;
+        // Do NOT free stack->data here; caller owns the pointed data
+        free(stack);
+        stack = next;
+    }
 }
\ No newline at end of file
diff --git a/stack.h b/stack.h
index f7d542d..e2ca791 100644
--- a/stack.h
+++ b/stack.h
@@ -7,7 +7,12 @@ The latest element is taken from the stack. */
 
 #include <stdlib.h>
 
-//TODO: passenden Datentyp als struct anlegen
+// Stack node for linked-list based stack. Data pointer is stored but not freed by stack operations.
+typedef struct StackNode
+{
+    void *data;
+    struct StackNode *next;
+} StackNode;
 
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);
diff --git a/stack.o b/stack.o
new file mode 100644
index 0000000000000000000000000000000000000000..014f77e69daaa29e348d64c7ee0925c8768b2be4
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literal 0
HcmV?d00001

diff --git a/test_bintree b/test_bintree
new file mode 100755
index 0000000000000000000000000000000000000000..f59478759aec7e7eb8a4fb8efa1ddbed9f290f9d
GIT binary patch
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literal 0
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diff --git a/test_bintree.c b/test_bintree.c
new file mode 100644
index 0000000..fbcc0d6
--- /dev/null
+++ b/test_bintree.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "bintree.h"
+
+// comparator for unsigned int values stored by value in heap
+static int cmp_uint_ptr(const void *a, const void *b)
+{
+    unsigned int va = *(const unsigned int *)a;
+    unsigned int vb = *(const unsigned int *)b;
+    if(va < vb) return -1;
+    if(va > vb) return 1;
+    return 0;
+}
+
+int main(void)
+{
+    TreeNode *root = NULL;
+    unsigned int vals[] = {5, 2, 8, 1, 3, 7, 9};
+    const size_t n = sizeof(vals)/sizeof(vals[0]);
+
+    // insert values (copy made by addToTree)
+    for(size_t i = 0; i < n; i++)
+    {
+        int isDup = 0;
+        root = addToTree(root, &vals[i], sizeof(unsigned int), cmp_uint_ptr, &isDup);
+        if(root == NULL && isDup == 0) { fprintf(stderr, "addToTree allocation failed\n"); return 1; }
+    }
+
+    unsigned int sz = treeSize(root);
+    if(sz != n) { fprintf(stderr, "treeSize expected %zu got %u\n", n, sz); clearTree(root); return 2; }
+
+    // inorder traversal using nextTreeData
+    unsigned int last = 0;
+    int first = 1;
+    unsigned int *data = nextTreeData(root);
+    while(data != NULL)
+    {
+        unsigned int v = *data;
+        if(!first && v < last) { fprintf(stderr, "inorder traversal not sorted: %u after %u\n", v, last); clearTree(root); return 3; }
+        last = v; first = 0;
+        data = nextTreeData(NULL);
+    }
+
+    clearTree(root);
+    printf("test_bintree: OK\n");
+    return 0;
+}
diff --git a/test_bintree.dSYM/Contents/Info.plist b/test_bintree.dSYM/Contents/Info.plist
new file mode 100644
index 0000000..fe95a38
--- /dev/null
+++ b/test_bintree.dSYM/Contents/Info.plist
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.test_bintree</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>
diff --git a/test_bintree.dSYM/Contents/Resources/DWARF/test_bintree b/test_bintree.dSYM/Contents/Resources/DWARF/test_bintree
new file mode 100644
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test_bintree.dSYM/Contents/Resources/Relocations/x86_64/test_bintree.yml b/test_bintree.dSYM/Contents/Resources/Relocations/x86_64/test_bintree.yml
new file mode 100644
index 0000000..4fab309
--- /dev/null
+++ b/test_bintree.dSYM/Contents/Resources/Relocations/x86_64/test_bintree.yml
@@ -0,0 +1,20 @@
+---
+triple:          'x86_64-apple-darwin'
+binary-path:     test_bintree
+relocations:
+  - { offset: 0x26, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x1000007A0, symSize: 0x220 }
+  - { offset: 0x49, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x1000007A0, symSize: 0x220 }
+  - { offset: 0x121, size: 0x8, addend: 0x0, symName: _cmp_uint_ptr, symObjAddr: 0x220, symBinAddr: 0x1000009C0, symSize: 0x5A }
+  - { offset: 0x21B, size: 0x8, addend: 0x0, symName: _addToTree, symObjAddr: 0x0, symBinAddr: 0x100000A20, symSize: 0x1C0 }
+  - { offset: 0x228, size: 0x8, addend: 0x0, symName: _nextTreeData, symObjAddr: 0x1C0, symBinAddr: 0x100000BE0, symSize: 0xC0 }
+  - { offset: 0x24D, size: 0x8, addend: 0x0, symName: _nextTreeData.iterStack, symObjAddr: 0xFB0, symBinAddr: 0x100002000, symSize: 0x0 }
+  - { offset: 0x2EC, size: 0x8, addend: 0x0, symName: _addToTree, symObjAddr: 0x0, symBinAddr: 0x100000A20, symSize: 0x1C0 }
+  - { offset: 0x376, size: 0x8, addend: 0x0, symName: _bintree_pushLefts, symObjAddr: 0x280, symBinAddr: 0x100000CA0, symSize: 0x50 }
+  - { offset: 0x3A8, size: 0x8, addend: 0x0, symName: _clearTree, symObjAddr: 0x2D0, symBinAddr: 0x100000CF0, symSize: 0x60 }
+  - { offset: 0x3CC, size: 0x8, addend: 0x0, symName: _treeSize, symObjAddr: 0x330, symBinAddr: 0x100000D50, symSize: 0x56 }
+  - { offset: 0x47F, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100000DB0, symSize: 0x60 }
+  - { offset: 0x4C3, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100000DB0, symSize: 0x60 }
+  - { offset: 0x507, size: 0x8, addend: 0x0, symName: _pop, symObjAddr: 0x60, symBinAddr: 0x100000E10, symSize: 0x50 }
+  - { offset: 0x53D, size: 0x8, addend: 0x0, symName: _top, symObjAddr: 0xB0, symBinAddr: 0x100000E60, symSize: 0x40 }
+  - { offset: 0x565, size: 0x8, addend: 0x0, symName: _clearStack, symObjAddr: 0xF0, symBinAddr: 0x100000EA0, symSize: 0x3F }
+...
diff --git a/test_numbers b/test_numbers
new file mode 100755
index 0000000000000000000000000000000000000000..f45378c723c03535314225cc102e0e72d95eb6a5
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test_numbers.c b/test_numbers.c
new file mode 100644
index 0000000..067bb3b
--- /dev/null
+++ b/test_numbers.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "numbers.h"
+
+int main(void)
+{
+    unsigned int len = 100;
+    unsigned int *nums = createNumbers(len);
+    if(nums == NULL) { fprintf(stderr, "createNumbers returned NULL\n"); return 1; }
+
+    // count occurrences
+    unsigned int maxVal = 2 * len;
+    unsigned int *counts = calloc(maxVal + 1, sizeof(unsigned int));
+    if(counts == NULL) { free(nums); return 2; }
+
+    for(unsigned int i = 0; i < len; i++)
+    {
+        if(nums[i] > maxVal) { fprintf(stderr, "value out of expected range\n"); free(nums); free(counts); return 3; }
+        counts[nums[i]]++;
+    }
+
+    int duplicatesFound = 0;
+    unsigned int duplicateValue = 0;
+    for(unsigned int v = 1; v <= maxVal; v++)
+    {
+        if(counts[v] == 2) { duplicatesFound++; duplicateValue = v; }
+        else if(counts[v] > 2) { fprintf(stderr, "value %u appears more than twice\n", v); free(nums); free(counts); return 4; }
+    }
+
+    if(duplicatesFound != 1) { fprintf(stderr, "expected exactly one duplicated value, found %d\n", duplicatesFound); free(nums); free(counts); return 5; }
+
+    unsigned int found = getDuplicate(nums, len);
+    if(found != duplicateValue) { fprintf(stderr, "getDuplicate returned %u expected %u\n", found, duplicateValue); free(nums); free(counts); return 6; }
+
+    free(nums);
+    free(counts);
+
+    printf("test_numbers: OK (duplicate = %u)\n", duplicateValue);
+    return 0;
+}
diff --git a/test_numbers.dSYM/Contents/Info.plist b/test_numbers.dSYM/Contents/Info.plist
new file mode 100644
index 0000000..3520253
--- /dev/null
+++ b/test_numbers.dSYM/Contents/Info.plist
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.test_numbers</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>
diff --git a/test_numbers.dSYM/Contents/Resources/DWARF/test_numbers b/test_numbers.dSYM/Contents/Resources/DWARF/test_numbers
new file mode 100644
index 0000000000000000000000000000000000000000..1ea4795c12eb343a079f9709ddd12c285a361f31
GIT binary patch
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diff --git a/test_numbers.dSYM/Contents/Resources/Relocations/x86_64/test_numbers.yml b/test_numbers.dSYM/Contents/Resources/Relocations/x86_64/test_numbers.yml
new file mode 100644
index 0000000..703cd2f
--- /dev/null
+++ b/test_numbers.dSYM/Contents/Resources/Relocations/x86_64/test_numbers.yml
@@ -0,0 +1,24 @@
+---
+triple:          'x86_64-apple-darwin'
+binary-path:     test_numbers
+relocations:
+  - { offset: 0x26, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x1000013A0, symSize: 0x287 }
+  - { offset: 0x41, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x1000013A0, symSize: 0x287 }
+  - { offset: 0x12E, size: 0x8, addend: 0x0, symName: _createNumbers, symObjAddr: 0x0, symBinAddr: 0x100001630, symSize: 0x1D0 }
+  - { offset: 0x152, size: 0x8, addend: 0x0, symName: _createNumbers, symObjAddr: 0x0, symBinAddr: 0x100001630, symSize: 0x1D0 }
+  - { offset: 0x23E, size: 0x8, addend: 0x0, symName: _compareUInt, symObjAddr: 0x1D0, symBinAddr: 0x100001800, symSize: 0x60 }
+  - { offset: 0x290, size: 0x8, addend: 0x0, symName: _getDuplicate, symObjAddr: 0x230, symBinAddr: 0x100001860, symSize: 0x110 }
+  - { offset: 0x2FE, size: 0x8, addend: 0x0, symName: _qsort_uint_cmp, symObjAddr: 0x340, symBinAddr: 0x100001970, symSize: 0x5A }
+  - { offset: 0x3C5, size: 0x8, addend: 0x0, symName: _addToTree, symObjAddr: 0x0, symBinAddr: 0x1000019D0, symSize: 0x1C0 }
+  - { offset: 0x3D2, size: 0x8, addend: 0x0, symName: _nextTreeData, symObjAddr: 0x1C0, symBinAddr: 0x100001B90, symSize: 0xC0 }
+  - { offset: 0x3F7, size: 0x8, addend: 0x0, symName: _nextTreeData.iterStack, symObjAddr: 0xFB0, symBinAddr: 0x100003000, symSize: 0x0 }
+  - { offset: 0x496, size: 0x8, addend: 0x0, symName: _addToTree, symObjAddr: 0x0, symBinAddr: 0x1000019D0, symSize: 0x1C0 }
+  - { offset: 0x520, size: 0x8, addend: 0x0, symName: _bintree_pushLefts, symObjAddr: 0x280, symBinAddr: 0x100001C50, symSize: 0x50 }
+  - { offset: 0x552, size: 0x8, addend: 0x0, symName: _clearTree, symObjAddr: 0x2D0, symBinAddr: 0x100001CA0, symSize: 0x60 }
+  - { offset: 0x576, size: 0x8, addend: 0x0, symName: _treeSize, symObjAddr: 0x330, symBinAddr: 0x100001D00, symSize: 0x56 }
+  - { offset: 0x629, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100001D60, symSize: 0x60 }
+  - { offset: 0x66D, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100001D60, symSize: 0x60 }
+  - { offset: 0x6B1, size: 0x8, addend: 0x0, symName: _pop, symObjAddr: 0x60, symBinAddr: 0x100001DC0, symSize: 0x50 }
+  - { offset: 0x6E7, size: 0x8, addend: 0x0, symName: _top, symObjAddr: 0xB0, symBinAddr: 0x100001E10, symSize: 0x40 }
+  - { offset: 0x70F, size: 0x8, addend: 0x0, symName: _clearStack, symObjAddr: 0xF0, symBinAddr: 0x100001E50, symSize: 0x3F }
+...
diff --git a/test_stack b/test_stack
new file mode 100755
index 0000000000000000000000000000000000000000..fe4df871e6402daa1243626a34c092632ac2d8c9
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test_stack.c b/test_stack.c
new file mode 100644
index 0000000..a89ddd6
--- /dev/null
+++ b/test_stack.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "stack.h"
+
+int main(void)
+{
+    StackNode *s = NULL;
+
+    // push 3 integers
+    int *a = malloc(sizeof(int)); *a = 1; s = push(s, a);
+    int *b = malloc(sizeof(int)); *b = 2; s = push(s, b);
+    int *c = malloc(sizeof(int)); *c = 3; s = push(s, c);
+
+    // top should be c (3)
+    int *topv = (int *)top(s);
+    if(topv == NULL || *topv != 3) { fprintf(stderr, "stack top expected 3\n"); return 1; }
+
+    // pop -> now top should be 2
+    s = pop(s);
+    topv = (int *)top(s);
+    if(topv == NULL || *topv != 2) { fprintf(stderr, "stack top expected 2 after pop\n"); return 2; }
+
+    // pop -> now top should be 1
+    s = pop(s);
+    topv = (int *)top(s);
+    if(topv == NULL || *topv != 1) { fprintf(stderr, "stack top expected 1 after pop\n"); return 3; }
+
+    // pop last
+    s = pop(s);
+    if(s != NULL) { fprintf(stderr, "stack expected empty after popping all\n"); return 4; }
+
+    // free stored data (stack does not free data)
+    free(a); free(b); free(c);
+
+    // test clearStack on empty and small stacks
+    s = push(s, malloc(sizeof(int)));
+    s = push(s, malloc(sizeof(int)));
+    clearStack(s); // clearStack must free nodes but not payload; free payloads not necessary because we leaked intentionally for test of API
+    // Note: above payloads are not freed (stack API spec); this test ensures clearStack doesn't crash.
+    // Success
+    printf("test_stack: OK\n");
+    return 0;
+}
diff --git a/test_stack.dSYM/Contents/Info.plist b/test_stack.dSYM/Contents/Info.plist
new file mode 100644
index 0000000..eca9d8f
--- /dev/null
+++ b/test_stack.dSYM/Contents/Info.plist
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.test_stack</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>
diff --git a/test_stack.dSYM/Contents/Resources/DWARF/test_stack b/test_stack.dSYM/Contents/Resources/DWARF/test_stack
new file mode 100644
index 0000000000000000000000000000000000000000..aa57c7c2cb3991693f165182bdd66275c603641f
GIT binary patch
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diff --git a/test_stack.dSYM/Contents/Resources/Relocations/x86_64/test_stack.yml b/test_stack.dSYM/Contents/Resources/Relocations/x86_64/test_stack.yml
new file mode 100644
index 0000000..6432f19
--- /dev/null
+++ b/test_stack.dSYM/Contents/Resources/Relocations/x86_64/test_stack.yml
@@ -0,0 +1,12 @@
+---
+triple:          'x86_64-apple-darwin'
+binary-path:     test_stack
+relocations:
+  - { offset: 0x26, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x100000B80, symSize: 0x249 }
+  - { offset: 0x4E, size: 0x8, addend: 0x0, symName: _main, symObjAddr: 0x0, symBinAddr: 0x100000B80, symSize: 0x249 }
+  - { offset: 0x10A, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100000DD0, symSize: 0x60 }
+  - { offset: 0x14E, size: 0x8, addend: 0x0, symName: _push, symObjAddr: 0x0, symBinAddr: 0x100000DD0, symSize: 0x60 }
+  - { offset: 0x192, size: 0x8, addend: 0x0, symName: _pop, symObjAddr: 0x60, symBinAddr: 0x100000E30, symSize: 0x50 }
+  - { offset: 0x1C8, size: 0x8, addend: 0x0, symName: _top, symObjAddr: 0xB0, symBinAddr: 0x100000E80, symSize: 0x40 }
+  - { offset: 0x1F0, size: 0x8, addend: 0x0, symName: _clearStack, symObjAddr: 0xF0, symBinAddr: 0x100000EC0, symSize: 0x3F }
+...
diff --git a/timer.o b/timer.o
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