Time O(n) space O(n)
#include <iostream>
#include<limits.h>
using namespace std;
void fun(int arr[],int size){
int count=0;
int has[100]={0};
for(int i=0;i<size;i++){
if(!has[arr[i]]){
arr[count++]=arr[i];
has[arr[i]]=1;
}
}
for(int i=0;i<count;i++)
cout<<arr[i]<<" ";
}
int main()
{
//cout << "Hello World!" << endl;
int arr[]={4, 8, 4, 1, 1, 2, 9};
int size=sizeof(arr)/sizeof(arr[0]);
fun(arr,size);
return 0;
}