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polin1 = [1,2,-1] #x^2+2*x-1
polin2 = [1,1,0] #x^2+x

def multiply_polinoms(pol1,pol2):
len_polin1 = len(pol1) #count len of polin1
len_polin2 = len(pol2) #count len of polin2
result = [0]*(len_polin1+len_polin2-1) #create new list for result

for i in range(0,len_polin1):
    for j in range(0,len_polin2):
        result[i+j] += pol1[i]*pol2[j]      #write result of multiplication in new list

return result

print(multiply_polinoms(polin1, polin2))