12 lines
347 B
Python
12 lines
347 B
Python
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# https://www.codewars.com/kata/5324945e2ece5e1f32000370/
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def sum_strings(s1, s2):
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res = ""
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carry = 0
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s1, s2 = s1.zfill(len(s2)), s2.zfill(len(s1))
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for d1, d2 in zip(s1[::-1], s2[::-1]):
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carry, total = divmod(int(d1) + int(d2) + carry, 10)
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res += str(total)
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return (str(carry) + res[::-1]).lstrip('0') or '0'
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