What measure should I look to find these harmonic and melodic runs.
Hi,
No specific measures; but the harmonic and melodic minor scales have notes that are sharpened. For example, in this thread's C-minor vs Eb-major example, if the B note is not a Bb, there's a chance of minor scale. In general, as @riprock already mentioned, the music can readily identify major vs minor (which can be reflected by the chords and tonic usages), but there are other methods as well.