Tribonacci series c++

 int n;
    cin>>n;
    int a=0,b=0,c=1;
    if (n < 3) return 0;
    cout<<a<<" "<<b<<" "<<c<<" ";
    for(int i = 1; i<= n-3; i++){
        int d = a + b + c;
        cout<<d<<" ";
        a = b;
        b = c;
        c = d;
    }

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