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## arrInput = [2, 7, 4, 1, 8, 1] ## Example 1
## arrInput = [1] ## Example 2
arrInput = [1, 1] ## Example 3
arrSort = sorted(arrInput, reverse = True)
if len(arrSort) == 1:
print (arrSort[0])
else:
while len(arrSort) > 1:
nElem_01 = arrSort[0]
nElem_02 = arrSort[1]
arrSort.pop(1)
arrSort.pop(0)
if nElem_01 != nElem_02:
arrSort.append(abs(nElem_01 - nElem_02))
arrSort = sorted(arrSort, reverse = True)
if len(arrSort) == 1:
print (arrSort[0])
else:
print (0)
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