Cpp program to find whether it is a unique array or not

Write a Cpp program to find whether it is a unique array or not

#include<iostream>
using namespace std;
int main(){
    int num[5],a,flag=0;
    cout<<"Enter 5 elements in an array";
    for(a=0;a<5;a++)
    {
        cin>>num[a];
    }
    for(a=0;a<5;a++)
    {        
        for(int b=a+1;b<5;b++)
        {
            if(num[a]==num[b])
            {
                flag=1;
                //cout<<num[a];
                break;
            }
        }
    }
    if(flag!=1)
    {
        cout<<"Unique array ";
    }
    else
    {
        cout<<"Not a Unique array ";
    }
    return 0;
}

Enter 5 elements in an array

1

2

3

3

4

Not a unique array