Solve problem 70 in Python.

python/lib_misc.py

@@ -206,3 +206,14 @@ def get_digit_count(n):
     Returns the number of digits for n.
     """
     return len(str(n))
+
+
+def is_permutation(n, p):
+    """ Checks if p is a permutation of n. """
+    digit_counts_n = [0 for _ in range(10)]
+    digit_counts_p = [0 for _ in range(10)]
+    for d_n in str(n):
+        digit_counts_n[int(d_n)] += 1
+    for p_n in str(p):
+        digit_counts_p[int(p_n)] += 1
+    return digit_counts_n == digit_counts_p