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#! /usr/bin/python3
import unittest
def coinsum(c,s):
m=list()
for i in range(len(c)):
m.append(int(s/c[i]))
out=list()
b=[0 for i in range(len(c))]
of=1
while of:
v=sum(c[i]*b[i] for i in range(len(c)))
if v==s:
out.append(b.copy())
i=0
while 1:
b[i]+=1
if b[i]>m[i]:
b[i]=0
i+=1
if i>len(b)-1:
of=0
break;
else:
break;
return len(out)
class TestMajority(unittest.TestCase):
def test_ex(self):
self.assertEqual(coinsum((1,2,4),6),6,'example')
unittest.main()
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