reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

ebook_src/builtin_structures/find_dice_probabilities.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+'''
+given 2 dice, determine number of ways to sum S if all dice are rolled
+'''
+
+from collections import Counter, defaultdict
+
+def find_dice_probabilities(S=5, n_faces=6):
+    if S > 2*n_faces or S < 2:
+        return None
+
+    cdict = Counter()
+    ddict = defaultdict(list)
+
+    for dice1 in range(1, n_faces+1):
+        for dice2 in range(1, n_faces+1):
+            t = [dice1, dice2]
+            cdict[dice1+dice2] += 1
+            ddict[dice1+dice2].append( t)
+
+    return [cdict[S], ddict[S]]
+
+
+
+
+
+if __name__ == '__main__':
+    results = find_dice_probabilities()
+    assert(results[0] == len(results[1]))