TWC195

1 files changed, 36 insertions, 0 deletions

diff --git a/challenge-195/deadmarshal/cpp/ch-2.cpp b/challenge-195/deadmarshal/cpp/ch-2.cpp
new file mode 100644
index 0000000000..610a1bdf62
--- /dev/null
+++ b/challenge-195/deadmarshal/cpp/ch-2.cpp
@@ -0,0 +1,36 @@
+#include<iostream>
+#include<vector>
+#include<map>
+#include<algorithm>
+
+int most_frequent_even(std::vector<int> vec)
+{
+  if(std::all_of(vec.begin(),
+		 vec.end(),
+		 [](int i){return i % 2 != 0;})) return -1;
+  vec.erase(std::remove_if(vec.begin(),
+			   vec.end(),
+			   [](int i){return i % 2 != 0;}),
+	    vec.end());
+  std::map<int,int,std::greater<int>> map{};
+  std::vector<int> keys{},vals{};
+  for(const auto& i : vec) map[i]++;
+  for(const auto& kv : map)
+  {
+    keys.push_back(kv.first);
+    vals.push_back(kv.second);
+  }
+  const bool has_dups =
+    std::adjacent_find(vals.begin(), vals.end()) != vals.end();
+  if(!has_dups) return keys.back();
+  return keys.back();
+}
+
+int main()
+{
+  std::cout << most_frequent_even({1,1,2,6,2}) << '\n';
+  std::cout << most_frequent_even({1,3,5,7}) << '\n';
+  std::cout << most_frequent_even({6,4,4,6,1}) << '\n';
+  return 0;
+}
+