Template Function sequant::sort_then_replace_by_ordinals

• Defined in File utils.hpp

Function Documentation

template<typename IntegerSequence>
int sequant::sort_then_replace_by_ordinals(IntegerSequence &iseq)

sorts a sequence of integers in the lexicographic order (w.r.t. operator<) and overwrites them with their input ordinals e.g. {23,7,14} is overwritten with {1,2,0}. Effectively, this inverts the permutation (input is a to-permutation, the results is a from-permutation, just reindexed)

Parameters:

iseq – [inout] on input: a sequence of integers, on output: sequence of input ordinals of the elements of sorted seq

Returns:

-1 if permutation is off parity, else