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CMU Coding Bootcamp
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051def encodeSimpleCipher(s: str) -> str: """ Encode a string using this formula. - s[i] = 2*i - if 2*i > len(s), s[i] = (2*i) % len(s) """ encoded = list(s) for i in range(len(s)): j = (2 * i) % len(s) cj = encoded[j] encoded[j] = encoded[i] encoded[i] = cj return "".join(encoded)
def decodeSimpleCipher(s: str) -> str: """Decode a string encoded from encodeSimpleCipher""" decoded = list(s) for i in range(len(s) - 1, -1, -1): j = (2 * i) % len(s) cj = decoded[j] decoded[j] = decoded[i] decoded[i] = cj return "".join(decoded)
print("Testing encodeSimpleCipher()...", end="")assert encodeSimpleCipher("AB") == "BA"assert encodeSimpleCipher("ABC") == "ABC"assert encodeSimpleCipher("ABCD") == "BCDA"assert encodeSimpleCipher("ABCDEFGH") == "BCFGDEHA"assert encodeSimpleCipher("SECRET MESSAGE") == "MCE SSTSAEREEG"assert ( encodeSimpleCipher("THIS IS A LONGER SECRET MESSAGE JUST FOR YOU!") == "T SAENG SR MGARJ H U!SSTE TFECORIIEYSELUOOS")print("Passed!")
print("Testing decodeSimpleCipher()...", end="")assert decodeSimpleCipher("BA") == "AB"assert decodeSimpleCipher("ABC") == "ABC"assert decodeSimpleCipher("BCDA") == "ABCD"assert decodeSimpleCipher("BCFGDEHA") == "ABCDEFGH"assert decodeSimpleCipher("MCE SSTSAEREEG") == "SECRET MESSAGE"assert ( decodeSimpleCipher("T SAENG SR MGARJ H U!SSTE TFECORIIEYSELUOOS") == "THIS IS A LONGER SECRET MESSAGE JUST FOR YOU!")print("Passed!")