leetcode_gym/_problems/addStrings.md

layout, title, last_solved, category, leetcode_url, status

layout	title	last_solved	category	leetcode_url	status
page	Add Strings	2020-05-30	math	https://leetcode.com/problems/add-strings/	Attempted

Problem

Given "12" and "3", return "15". You must not use any built-in BigInteger library or convert the inputs to integer directly.

Solution

Wasn't suppose to convert to integers

{% highlight python %}

def addStrings(self, num1: str, num2: str) -> str:

def itoa(num1):
    
    sum=0
    digitCol = 0
    for i in reversed( range(len(num1)) ):
        
        digit = ord(num1[i])-ord('0')   # '2'-'0' = 2
        sum += (digit * (10**digitCol))
        digitCol+=1
    
    return(sum)

return itoa(num1)+itoa(num2)

{% endhighlight %}