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def find_chords(chords, music): | |
"""Search for chords within music (O(n) time). | |
:param list chords: chords to look for, in order | |
:param list music: music to search within | |
""" | |
if len(music) < len(chords): | |
return 0 | |
my_chord_i = -1 | |
occurrences = 0 | |
for my_chord in music: | |
if my_chord in chords: | |
j = chords.index(my_chord) | |
if j > my_chord_i: | |
my_chord_i = j | |
if my_chord_i == len(chords) -1: | |
occurrences += 1 | |
my_chord_i = -1 | |
return occurrences | |
if __name__ == '__main__': | |
chords = ['C', 'F', 'G'] | |
music0 = ['C', 'F'] | |
times0 = find_chords(chords, music0) | |
assert times0 == 0 | |
music1 = ['C', 'F', 'G'] | |
times1 = find_chords(chords, music1) | |
assert times1 == 1 | |
music2 = ['C', 'F', 'G', 'A', 'C', 'F', 'G', 'E'] | |
times2 = find_chords(chords, music2) | |
assert times2 == 2 | |
music3 = ['C', 'F', 'G', 'C', 'F', 'C', 'F', 'G', 'B', 'C', 'F', 'G'] | |
times3 = find_chords(chords, music3) | |
assert times3 == 3 |
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