C++ Question!!!! Write a function that fills a dynamic, n x n array with integer

Question

C++ Question!!!!

Write a function that fills a dynamic, n x n array with integers from 1 to n x n exactly. The array contains no duplicates. Use the array you created in problem 1 to create the array. The function's prototype is void randomFillUnique(int** a, int n); Write a program to test your function.

I am struggling with making an random number dynamic array with no repeating number..

Please help me!!

This is the code what I did

#include <iostream>

#include <ctime>

#include<random>

using namespace std;

int ** gen2Array(int n);

void randomnumberFillUnique(int**p, int n,int lbound, int ubound);

int main()

{ int** p = gen2Array(3);

const int lbound = 1;

const int ubound = 9;

cout << "The dynamic array is : " << endl;

for

(int i = 0;i<3;i++)

{

for (int j = 0;j < 3;j++)

{ cout << p[2][2] << "/t"; }

cout << " "; }

system("pause");

return 0; }

int ** gen2Array(int n) {

int **p; p = new int*[n]; // dynamic `array (size) of pointers to int`

for (int i = 0; i < n; i++) {

p[i] = new int[n]; // each i-th pointer is now pointing to dynamic array (size*2) of actual int values

}

return p;

}

void randomnumberFillUnique(int**p, int n, int lbound, int ubound) {

static default_random_engine e(time(NULL));

uniform_int_distribution u(lbound, ubound);

p = u(e);

for (int i = 0; i < n;i++) {

p = p % (i + 1);

}

}

Explanation / Answer

#include <stdio.h>
#include <stdlib.h>

size_t rmdup(int *arr, size_t len)
{
size_t prev = 0;
size_t curr = 1;
size_t last = len - 1;
while (curr <= last) {
for (prev = 0; prev < curr && arr[curr] != arr[prev]; ++prev);
if (prev == curr) {
++curr;
} else {
arr[curr] = arr[last];
--last;
}
}
return curr;
}

void print_array(int *arr, size_t len)
{
printf("{");
size_t curr = 0;
for (curr = 0; curr < len; ++curr) {
if (curr > 0) printf(", ");
printf("%d", arr[curr]);
}
printf("}");
}

int main()
{
int arr[] = {4, 8, 4, 1, 1, 2, 9};
printf("Before: ");
size_t len = sizeof (arr) / sizeof (arr[0]);
print_array(arr, len);
len = rmdup(arr, len);
printf(" After: ");
print_array(arr, len);
printf(" ");
return 0;
}

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