I am trying to implement the Huffman Coding Algo using the smart pointers, but it does not work properly. I came to know that in some stage at ‘build_tree’ the pointer is nullptr I do not know why.

I am trying to implement the Huffman Coding Algo using the smart pointers, but it does not work properly. I came to know that in some stage at ‘build_tree’ the pointer is nullptr I do not know why.

I am trying to implement the Huffman Coding Algo using the smart pointers, but it does not work properly. I came to know that in some stage at ‘build_tree’ the pointer is nullptr I do not know why.