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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Move-to-front-algorithm/Python/move-to-front-algorithm-2.py Normal file
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def m2f_e(s, st):
return [[st.index(ch), st.insert(0, st.pop(st.index(ch)))][0] for ch in s]
def m2f_d(sq, st):
return ''.join([st[i], st.insert(0, st.pop(i))][0] for i in sq)
ST = list('abcdefghijklmnopqrstuvwxyz')
for s in ['broood', 'bananaaa', 'hiphophiphop']:
encode = m2f_e(s, ST[::])
print('%14r encodes to %r' % (s, encode), end=', ')
decode = m2f_d(encode, ST[::])
print('decodes back to %r' % decode)
assert s == decode, 'Whoops!'