diff --git a/leet_961.rb b/leet_961.rb
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+# https://leetcode.com/problems/N-Repeated Element in Size 2N Array/
+# Runtime: 48 ms, faster than 81.88% of ruby online submissions for N-Repeated Element in Size 2N Array
+def repeated_n_times(a)
+  ans = Hash.new(0)
+  a.each do |k|
+    if ans[k] > 1
+      return k
+    else
+      ans[k] +=1
+    end
+  end
+  return ans.max_by{|k,v| v}[0]
+end