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51 lines (38 loc) · 848 Bytes
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challenge_10.py
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51 lines (38 loc) · 848 Bytes
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# 1 2 2 4 6
# a = [1, 11, 21, 1211, 111221,
# 1 4 7 49 376
# len(a[30]) = ?
def encode(value):
'''
>>> encode('1211')
'111221'
>>> encode('111221')
'312211'
'''
previous = None
count = 0
encoded = ''
def encode_char():
return str(count) + str(previous)
for char in value:
if previous == None:
count = 1
previous = char
continue
if char == previous:
count += 1
else:
encoded += encode_char()
count = 1
previous = char
encoded += encode_char()
return encoded
a = ['1']
for i in range(30):
current = a[i]
a.append(encode(current))
print len(a[30])
# 5808
if __name__ == '__main__':
import doctest
doctest.testmod()