Add kattis prob anagramcounting in Python2

kattis/anagramcounting/solution.py

@@ -0,0 +1,19 @@
+import sys
+
+def fact(n):
+    ans = 1;
+    for i in xrange(2, n+1):
+        ans *= i
+    return ans
+
+for line in sys.stdin.readlines():
+    letter_counts = {}
+    for letter in line[:-1]:
+        if letter in letter_counts:
+            letter_counts[letter] += 1
+        else:
+            letter_counts[letter] = 1
+    ans = fact(len(line)-1)
+    for letter in letter_counts:
+        ans /= fact(letter_counts[letter])
+    print(ans)