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leetcode-415-add-strings.py
36 lines (34 loc) · 1.05 KB
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leetcode-415-add-strings.py
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class Solution(object):
def addStrings(self, num1, num2):
"""
:type num1: str
:type num2: str
:rtype: str
"""
ans = ''
carry = 0
while num1 or num2:
if not num1:
inter_sum = int(num2[-1]) + carry
num2 = num2[:-1]
elif not num2:
inter_sum = int(num1[-1]) + carry
num1 = num1[:-1]
else:
inter_sum = int(num1[-1]) + int(num2[-1]) + carry
print(inter_sum, int(num1[-1]), int(num2[-1]), carry)
num1 = num1[:-1]
num2 = num2[:-1]
if inter_sum >= 10:
new_sum = inter_sum % 10
carry = int((inter_sum - new_sum) / 10)
inter_sum = new_sum
else:
carry = 0
ans = str(inter_sum) + ans
if carry:
ans = str(carry) + ans
return ans
if __name__ == '__main__':
s = Solution()
print(s.addStrings("123456789", "987654321"))