Solved 40

problem40.py

+#!/usr/bin/env python
+def multdigits(D):
+    answer = n = 1
+    start = 0
+    d = D.pop(0) - 1
+
+    while True:
+        ns = str(n)
+        end = start + len(ns)
+
+        while start <= d < end:
+            answer *= int(ns[d - start])
+
+            if not len(D):
+                return answer
+
+            d = D.pop(0) - 1
+
+        start = end
+        n += 1
+
+    return answer
+
+print multdigits([10 ** e for e in range(7)])