fix: remove leftover files

a.cc

@@ -1,65 +0,0 @@
-#include <deque>
-#include <stdexcept>
-#include <utility>
-
-class ExtremaCircularBuffer {
-public:
-  explicit ExtremaCircularBuffer(size_t capacity) : capacity(capacity) {}
-
-  void push_back(double value) {
-    if (prices.size() == capacity) {
-      double front_value = prices.front();
-      pop_max(front_value);
-      prices.pop_front();
-    }
-
-    prices.push_back(value);
-    push_max(value);
-  }
-
-  void pop_front() {
-    if (prices.empty()) {
-      throw std::out_of_range("Cannot pop_front() from empty buffer");
-    }
-
-    double front_value = prices.front();
-    pop_max(front_value);
-    prices.pop_front();
-  }
-
-  size_t size() const { return prices.size(); }
-
-  double get_max() const {
-    if (prices.empty()) {
-      throw std::out_of_range("Cannot find max() of empty buffer");
-    }
-
-    return maxs.front().first;
-  }
-
-private:
-  void push_max(double value) {
-    size_t popped = 0;
-
-    while (!maxs.empty() && maxs.back().first < value) {
-      popped += maxs.back().second + 1;
-      maxs.pop_back();
-    }
-
-    maxs.emplace_back(value, popped);
-  }
-
-  void pop_max(double value) {
-    size_t popped = maxs.front().second;
-
-    if (popped == 0) {
-      maxs.pop_front();
-    } else {
-      --maxs.front().second;
-    }
-  }
-
-  std::deque<double> prices;
-  std::deque<std::pair<double, size_t>> maxs;
-  size_t capacity;
-};