#include <iostream>
using namespace std;

int main()
{
    int arr[20];            //the array of numbers
    bool isInArray[101];    //an array that stores whether a number already exists in the array
    int ptr=0;              //the current index in array

    //initialize all elements in isInArray[] to false
    for(int i=0;i<101;i++){
        isInArray[i]=false;
    }

    cout<<"Please input 20 integers between 10 and 100, inclusive:\n"; //prompts the user to enter 20 integers

    for(int i=0;i<20;i++){
        int temp;   //creates a variable to store the next number in input
        cin>>temp;  //reads the input

        //checks whether the number already exists in the array, and stores the number if it does not
        if(!isInArray[temp]){
            arr[ptr]=temp;
            ptr++;              //increments current index number
        }

        isInArray[temp]=true;   //sets that the current number exists in the array
    }

    cout<<"\nThe uniques values that you have entered:\n";

    for(int i=0;i<ptr;i++){
        cout<<arr[i]<<" ";
    }
}

/*
Please input 20 integers between 10 and 100, inclusive:
12 59 12 42 53 15 42 42 10 21 54 54 21 10 11 12 99 94 49 99

The uniques values that you have entered:
12 59 42 53 15 10 21 54 11 99 94 49
*/