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+#+title: boyer-moore
+
+#+date: <2018-06-04>
+
+The
+[[https://en.wikipedia.org/wiki/Boyer–Moore_majority_vote_algorithm][Boyer-Moore
+algorithm for finding the majority of a sequence of elements]] falls in
+the category of "very clever algorithms".
+
+#+begin_example
+  int majorityElement(vector<int>& xs) {
+      int count = 0;
+      int maj = xs[0];
+      for (auto x : xs) {
+          if (x == maj) count++;
+          else if (count == 0) maj = x;
+          else count--;
+      }
+      return maj;
+  }
+#+end_example