1 files changed, 54 insertions, 0 deletions
diff --git a/store/works/life/2020-algorithm-contest/code/2.cpp b/store/works/life/2020-algorithm-contest/code/2.cpp
new file mode 100644
index 0000000..2d5fded
--- /dev/null
+++ b/store/works/life/2020-algorithm-contest/code/2.cpp
@@ -0,0 +1,54 @@
+#include <iostream>
+#include <map>
+#include <vector>
+#include <algorithm>
+
+int main()
+{
+    int size;
+    std::cin >> size;
+    int target;
+    std::cin >> target;
+
+    std::map<int, int> nums;
+
+    for (int i = 0; i < size; i++)
+    {
+        int v;
+        std::cin >> v;
+
+        nums[v]++;
+    }
+
+    std::vector<int> counts;
+    std::vector<std::vector<int>> sets;
+
+    for (const auto &pair : nums)
+    {
+        auto iter = std::lower_bound(counts.cbegin(), counts.cend(), pair.second);
+        if (iter != counts.cend() && *iter == pair.second)
+        {
+            sets[iter - counts.cbegin()].push_back(pair.first);
+        }
+        else
+        {
+            const auto offset = iter - counts.cbegin();
+            counts.insert(iter, pair.second);
+            sets.insert(sets.cbegin() + offset, std::vector<int>{pair.first});
+        }
+    }
+
+    if (target > counts.size())
+    {
+        std::cout << 0;
+    }
+    else
+    {
+        const auto &set = sets[counts.size() - target];
+        std::cout << set.size() << '\n';
+        for (auto i : set)
+            std::cout << i << ' ';
+    }
+
+    return 0;
+}