Leetcode 415. Add Strings
Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2.Note:
The length of both num1 and num2 is < 5100.
Both num1 and num2 contains only digits 0-9.
Both num1 and num2 does not contain any leading zero.
You must not use any built-in BigInteger library or convert the inputs to integer directly.
class Solution:
def addStrings(self, num1: str, num2: str) -> str:
i, j = len(num1) - 1, len(num2) - 1
carry = 0
total = 0
result = ''
while i >= 0 or j >= 0:
total = carry
if i >= 0:
total += ord(num1) - 48
if j >= 0:
total += ord(num2) - 48
result += str(total % 10)
carry = total // 10
i -= 1
j -= 1
if carry > 0:
result += str(carry)
return result[::-1]
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