- Soon, heuristic 4 will be the only one. Degree, closeness, and leverage will be chosen through parameters.
- Validate the number of vertices in the input against the adjacency matrix or edge list
- Improve closeness centrality at heuristic 4 (split closeness vector for each thread against pass-by-reference for all vector)
- Implement sum of trees in 64-bit unsigned integer: unsigned long long