14 lines
259 B
Python
14 lines
259 B
Python
def sum_to_n(n: int):
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"""sum_to_n is a function that sums numbers from 1 to n.
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>>> sum_to_n(30)
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465
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>>> sum_to_n(100)
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5050
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>>> sum_to_n(5)
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15
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>>> sum_to_n(10)
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55
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>>> sum_to_n(1)
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1
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"""
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return n * (n + 1) // 2 |