Tell me please, why my C++ code has WRONG ANSWER 1

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

int main()
{
    int N;
    cin>>N;
    srand((int)__TIME__);
    set <int> arr;
    while (arr.size()!=N)
    {
        int temp = rand()%(N+1);
        if (arr.find(temp)==arr.end() && temp!=0)
        {
            cout<<temp<<" ";
            arr.insert(temp);
        }
    }
    return 0;
}


it is not standart solution, but it is right