78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include <string.h>
|
|
#include "numbers.h"
|
|
#include "bintree.h"
|
|
|
|
CompareFctType compareFct(const void *arg1, const void *arg2)
|
|
{
|
|
const unsigned int *entry1 = arg1;
|
|
const unsigned int *entry2 = arg2;
|
|
|
|
int result = *entry2 - *entry1;
|
|
|
|
return result;
|
|
}
|
|
|
|
// 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. */
|
|
|
|
// 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)
|
|
{
|
|
srand(time(NULL));
|
|
|
|
TreeNode *numbers;
|
|
|
|
int isDuplicate = 0;
|
|
unsigned int number = rand() % (2 * len) + 1;
|
|
unsigned int* array = malloc(len*sizeof(int));
|
|
|
|
numbers = addToTree(NULL, &number, sizeof(int), compareFct, &isDuplicate);
|
|
array[0] = number;
|
|
for (int i = 1; i < len; i++)
|
|
{
|
|
number = rand() % (2 * len) + 1;
|
|
addToTree(numbers, &number, sizeof(int), compareFct, &isDuplicate);
|
|
if (isDuplicate == 1)
|
|
{
|
|
isDuplicate = 0;
|
|
i--;
|
|
}else{
|
|
array[i] = number;
|
|
}
|
|
}
|
|
|
|
clearTree(numbers);
|
|
|
|
int duplicatePosition1 = rand() % len;
|
|
int duplicatePosition2 = rand() % len;
|
|
|
|
while(duplicatePosition2 == duplicatePosition1){
|
|
duplicatePosition2 = rand() % len;
|
|
}
|
|
|
|
array[duplicatePosition2] = array[duplicatePosition1];
|
|
|
|
return array;
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
qsort(numbers, len, sizeof(int), compareFct);
|
|
|
|
for(int i = 0; i < len-1; i++){
|
|
if(numbers[i] == numbers[i+1]){
|
|
return numbers[i];
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
} |