1) use addNNC() method to store the NNCs 2) convert all int's to size_t 3) remove .reserve() from the loop 4) use m_xxx instead of xxx_ 5) rename xyz1 to ijk1 etc.
1) use addNNC() method to store the NNCs 2) convert all int's to size_t 3) remove .reserve() from the loop 4) use m_xxx instead of xxx_ 5) rename xyz1 to ijk1 etc.