add attribution

OlgaSe · Dec 13, 2020 · 3648c84 · 3648c84
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commit 3648c84
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/README.md b/README.md
@@ -115,4 +115,6 @@ The hourglass with the maximum sum (19) is:
 2 4 4
   2
 1 2 4
-```
+```
+
+This problem was originally found on [HackerRank](https://www.hackerrank.com/challenges/2d-array/problem).