Added two mposts on ia and fsf

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+---
+date: 2018-06-04
+---
+
+The [Boyer-Moore algorithm for finding the majority of a sequence of elements](https://en.wikipedia.org/wiki/Boyer–Moore_majority_vote_algorithm) falls in the category of "very clever algorithms".
+
+    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;
+    }
+