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3671864507
- New examples using the new syntax (+=, ...) - New examples using the new methods (.pop(), .append(), ...) - Update old examples with assignement operators (+=, ...)
11 lines
205 B
Python
11 lines
205 B
Python
def sum_reverse (l):
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#@ ensures result == 0
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l2 = l.copy()
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l2.reverse()
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t = 0
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for i in range (len(l)):
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#@ invariant t == 0
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t += l[i]
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t -= l2[-(i+1)]
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return t
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