/** Buils a wt_coder_huff using the sequence of length n and the alphabet_mapper
* to determine the huffman codes */
wt_coder_huff(uint *symbs, uint n, alphabet_mapper * am);
/** Buils a wt_coder_huff using the sequence of length n and the alphabet_mapper
* to determine the huffman codes */
wt_coder_huff(uint *symbs, uint n, alphabet_mapper * am);