Leetcode discuss: 415. Add Strings

Here is the post.

C# My showcase of practice starting from Sept. 2018

June 17, 2020

Introduction
Since I am preparing for July 2020 Facebook phone screen, in reality I cannot find time to review 460 solved leetcode algorithms in one month, I like to review my past easy level algorithms and mistakes made shown in a blog in 2018 . What I like to do is to go over some of easy level algorithms first, and then try to put together some showcase for each algorithm, and also showcase for data structures, like Trie.

It is important to remove bias on easy tagged algorithms. I like to write more code in my preparation, so easy level algorithms should be better compared to middle level or hard level.

I also need to make sure that I can solve easy level algorithm in 10 to 15 minutes each. If it takes me more than 10 to 15 minutes, then I should write down lessons I should learn from the practice.

415 Add two strings

Problem statement (added on June 17, 2020)
Given two nonnegative integer numbers as string, calculate sum of two numbers.

Sept 15, 2018
C# my first practice has stack overflow issue on Sept 15 2018

C# iterative solution using a for loop

C# Warmup practice on June 17, 2020