in reply to Re^8: Odometer pattern iterator (in C).
in thread Odometer pattern iterator (in C). (Updated.)
You cannot do this inplace:
for( j = i+1; j < M; ++j ) idx[ i ] += N - idx[ M - j + i ];
as you are overwriting values that are still needed. This corresponds to the "reversing" the string part of the regex. In addition, you misread the formula, there is no += involved.
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