1 files changed, 39 insertions, 0 deletions
diff --git a/challenge-194/sgreen/python/ch-2.py b/challenge-194/sgreen/python/ch-2.py
new file mode 100755
index 0000000000..dfa570c4cf
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+++ b/challenge-194/sgreen/python/ch-2.py
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+#!/usr/bin/env python3
+
+import sys
+
+
+def main(s):
+    # Calculate the frequency of each letter
+    letter_freq = {}
+    for letter in s:
+        letter_freq[letter] = letter_freq.get(letter, 0) + 1
+
+    # Calculate the frequency of frequencies :)
+    freq = {}
+    for i in letter_freq.values():
+        freq[i] = freq.get(i, 0) + 1
+
+    solution = 0
+    # A solution is only possible if there are two different frequencies ...
+    if len(freq) == 2:
+        min_freq = min(freq.keys())
+        max_freq = max(freq.keys())
+
+        # ... and the minimum frequency only occurs once,
+        if min_freq == 1 and freq[1] == 1:
+            solution = 1
+
+        # ... or the difference between them is 1, and the higher frequency
+        #  only occurs once.
+        elif min_freq == max_freq - 1 and freq[max_freq] == 1:
+            solution = 1
+    elif len(freq) == 1 and 1 in freq:
+        # ... or the only thing we have is single letters
+        solution = 1
+
+    print(solution)
+
+
+if __name__ == '__main__':
+    main(sys.argv[1])