Stirling numbers of the second kind: Difference between revisions

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@@ Line 131: / Line 131: @@
 integer stirling2::get(int n, int k)
 {
-    if (k == 0 || n == 0)
-        return 0;
     if (k == n)
         return 1;
+    if (k == 0 || k > n)
+        return 0;
     auto p = std::make_pair(n, k);
     auto i = cache_.find(p);