"None" instead of [1,1,1,1]

Question

I’m making a problem that works like this: For example, suppose a team of 4 telemarketing vendors should make 6 calls, the times being 5, 2, 3, 3, 4, 9. As initially no vendor is busy, the first seller will make the 5 minute call, the second seller the 2-minute call and the number 3 and 4 sellers will make 3-minute calls. As the second seller will finish his call before the others, he will make the fifth call, of 4 minutes and, finally, the third seller (whose time is equal to the fourth seller, but his identification number is lower) will make the sixth call, of 9 minutes.

The function has to return a list with the number of calls each seller made. In the example above, it would have to return [1,2,2,1].

My code is for now only assessing whether the number of sellers is equal to the number of calls or higher. However, I am printing an example where that number is equal, and it is returning "None" instead of [1,1,1,1].

def ligacoes(n,l):
"Retorna uma lista que contem quantas ligacoes cada vendedor fara, seguindo as regras"
resultado = []
#v = numero de identificacao dos vendedores
    if n == len(l):
        for n in range(len(l)):
            resultado = resultado + [1]
    if n > len(l):
        for n in range(len(l)):
            resultado = resultado + [1]
        resultado = resultado + [0]

print ligacoes(4,[3,3,4,5])