I am currently attempting to answer the question Add Two Numbers from leetcode, my solution seems to function as I expect however in cases where my final carry int is needed it is not added to the end of my list in the final if statement.

I am currently attempting to answer the question Add Two Numbers from leetcode, my solution seems to function as I expect however in cases where my final carry int is needed it is not added to the end of my list in the final if statement.

I am trying to implement Huffman code encoder in C++: