The input file spdata.dat contains the information of all single-particle quantum numbers needed to define this space. In total we have \( 40 \) single-particle states labeled by \( n \), \( j \), \( l \) and \( m \), where \( m \) is the projection of the total single-particle angular momentum \( j \). To every set of single-particle quantum numbers there is a unique number \( p \) identifiying them, meaning that the two-body matrix elements in the file twobody.dat are identified as \( \langle pq \vert \hat{v}\vert rs \rangle \).
You will need to read these two files and set up arrays which store the matrix elements while running the program.