tribonacci series c 2b 2b

1 int n;
2    cin>>n;
3    int a=0,b=0,c=1;
4    if (n < 3) return 0;
5    cout<<a<<" "<<b<<" "<<c<<" ";
6    for(int i = 1; i<= n-3; i++){
7        int d = a + b + c;
8        cout<<d<<" ";
9        a = b;
10        b = c;
11        c = d;
12    }

1def trib_iter(m):
2    lista=[m]
3    c=0
4    d=True
5    while d==True:
6        novalista=[]
7        for n in lista:
8            if n in [0,1,2]:
9                c+=1
10            else:
11                for i in range(1,4):
12                    if n-i in [0,1,2]:
13                        c+=1
14                    else:
15                        if n-i<0:
16                            pass
17                        else:
18                            novalista.append(n-i)
19        if novalista==[]:
20            d=False
21        else:
22            lista=novalista
23    return c
24