Created
August 29, 2014 08:56
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Decode Numbers(CodeEval) in python 3.x
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# coding=utf-8 | |
import sys | |
import string | |
# A : 1 | |
# B : 2 | |
# C : 3 | |
# ... | |
# Z : 26 | |
mapping = dict([(c, str(i + 1)) for i, c in enumerate(string.ascii_uppercase)]) | |
def count_decode_way(s): | |
if not s or len(s) == 1: | |
return 1 | |
count = 0 | |
char_length = 1 | |
while True: | |
target = s[:char_length] | |
if len(target) != char_length: | |
break | |
if int(target) > 26: | |
break | |
count += count_decode_way(s[char_length:]) | |
char_length += 1 | |
return count | |
def main(): | |
with open(sys.argv[1], "r") as f: | |
for line in f: | |
line = line.rstrip() | |
print(count_decode_way(line)) | |
if __name__ == '__main__': | |
main() |
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