119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <string.h>
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#include "numbers.h"
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#include "bintree.h"
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//TODO: getDuplicate und createNumbers implementieren
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/* * * Erzeugen eines Arrays mit der vom Nutzer eingegebenen Anzahl an Zufallszahlen.
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* Sicherstellen, dass beim Befüllen keine Duplikate entstehen.
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* Duplizieren eines zufälligen Eintrags im Array.
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* in `getDuplicate()`: Sortieren des Arrays und Erkennen der doppelten Zahl durch Vergleich benachbarter Elemente. */
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// Returns len random numbers between 1 and 2x len in random order which are all different, except for two entries.
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// Returns NULL on errors. Use your implementation of the binary search tree to check for possible duplicates while
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// creating random numbers.
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static int compareUInt(const void *a, const void *b)
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{
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unsigned int A = *(unsigned int*)a;
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unsigned int B = *(unsigned int*)b;
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if (A < B) return -1;
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if (A > B) return 1;
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return 0;
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}
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// Sortiervergleich für qsort
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int compareQsort(const void *a, const void *b)
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{
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unsigned int A = *(const unsigned int*)a;
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unsigned int B = *(const unsigned int*)b;
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if (A < B) return -1;
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if (A > B) return +1;
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return 0;
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}
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unsigned int *createNumbers(unsigned int len)
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{
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if (len < 2) return NULL;
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srand((unsigned int)time(NULL));
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// Speicher für das Array
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unsigned int *numbers = malloc(sizeof(unsigned int) * len);
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if (!numbers) return NULL;
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TreeNode *root = NULL; // Baumwurzel
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unsigned int value;
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int isDuplicate;
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//Array mit eindeutigen Zufallszahlen füllen
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for (unsigned int i = 0; i < len; i++)
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{
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while (1)
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{
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value = (rand() % (2 * len)) + 1; // Zufallszahl 1..2*len
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isDuplicate = 0;
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TreeNode *newRoot = addToTree(
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root,
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&value,
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sizeof(unsigned int),
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compareUInt,
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&isDuplicate
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);
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if (!isDuplicate)
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{
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// Neue Zahl - akzeptieren
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root = newRoot;
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numbers[i] = value;
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break;
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}
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// Sonst neue Zahl generieren
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}
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}
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//genau eine Zufallszahl duplizieren
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unsigned int idx1 = rand() % len;
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unsigned int idx2 = rand() % len;
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while (idx2 == idx1)
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idx2 = rand() % len;
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numbers[idx2] = numbers[idx1];
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// Baum wieder freigeben
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clearTree(root);
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return numbers;
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}
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// Returns only the only number in numbers which is present twice. Returns zero on errors.
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unsigned int getDuplicate(const unsigned int numbers[], unsigned int len)
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{
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if (!numbers || len < 2) return 0;
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unsigned int *copy = malloc(len * sizeof(unsigned int));
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if (!copy) return 0;
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// Array kopieren
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memcpy(copy, numbers, len * sizeof(unsigned int));
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// Sortieren
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qsort(copy, len, sizeof(unsigned int), compareQsort);
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// Doppelte Zahl finden
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unsigned int duplicate = 0;
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for (unsigned int i = 0; i < len - 1; i++)
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{
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if (copy[i] == copy[i + 1])
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{
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duplicate = copy[i];
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break;
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}
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}
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free(copy);
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return duplicate;
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} |