#include <iostream>
#include<vector>
using namespace std;

void printTwoElements(vector<int>&arr){
    int n=arr.size();

    //Creating visited vector of size n+1 with
    //initial values are false. Note that array
    //values will go upto n,that is why we
    //we taken the size as n+1
    vector<bool>visited(n+1,false);
    int repeating =-1;
    int missing= -1;

    for(int i=0;i<n;i++){
        if(visited[arr[i]]){
            repeating=arr[i];
        }else{
            visited[arr[i]]=true;
        }
    }
    for(int i=1;i<=n;i++){
        if(!visited[i]){
            missing=i;
            break;
        }
    }

    cout<<"Repeating: "<<repeating<<endl;
    cout<<"Missing: "<<missing<<endl;
}

int main() {
    vector<int>arr={7,3,4,5,5,6,2};
    printTwoElements(arr);
    return 0;
}