#+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_src c++
  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_src