diff --git a/a.cpp b/a.cpp
index c97653d..27251be 100644
--- a/a.cpp
+++ b/a.cpp
@@ -5,5 +5,11 @@ using namespace atcoder;
 
 int main()
 {
-  cout << "hello,world" << endl;
+  int a[10];
+  for (int i = 0; i < 10; i++)
+  {
+    cin >> a[i];
+  }
+
+  cout << a[a[a[0]]] << endl;
 }
diff --git a/b.cpp b/b.cpp
index c97653d..2e5fb13 100644
--- a/b.cpp
+++ b/b.cpp
@@ -5,5 +5,27 @@ using namespace atcoder;
 
 int main()
 {
-  cout << "hello,world" << endl;
+  int n, m;
+  unordered_map<uint, uint> a;
+
+  cin >> n >> m;
+  for (int i = 0; i < n; i++)
+  {
+    uint tmp_a;
+    cin >> tmp_a;
+    a[tmp_a]++;
+  }
+  for (int i = 0; i < m; i++)
+  {
+    uint b;
+    cin >> b;
+
+    if (a[b] == 0)
+    {
+      cout << "No" << endl;
+      return 0;
+    }
+    a[b]--;
+  }
+  cout << "Yes" << endl;
 }
diff --git a/c.cpp b/c.cpp
index c97653d..01509aa 100644
--- a/c.cpp
+++ b/c.cpp
@@ -5,5 +5,120 @@ using namespace atcoder;
 
 int main()
 {
-  cout << "hello,world" << endl;
+  int n;
+  vector<vector<bool>> s;
+
+  cin >> n;
+  for (int y = 0; y < n; y++)
+  {
+    vector<bool> sn;
+    string str_s;
+    cin >> str_s;
+
+    for (int x = 0; x < n; x++)
+    {
+      sn.push_back(str_s[x] == '#');
+    }
+    s.push_back(sn);
+  }
+
+  for (int y = 0; y < n; y++)
+  {
+    int white_1 = -1, white_2 = -1, white_3 = -1;
+    for (int x = 0; x < n; x++)
+    {
+      if (s[y][x] == false)
+      {
+        white_3 = white_2;
+        white_2 = white_1;
+        white_1 = x;
+      }
+
+      if (x - 5 > white_3)
+      {
+        cout << "Yes" << endl;
+        return 0;
+      }
+    }
+  }
+
+  for (int x = 0; x < n; x++)
+  {
+    int white_1 = -1, white_2 = -1, white_3 = -1;
+    for (int y = 0; y < n; y++)
+    {
+      if (s[y][x] == false)
+      {
+        white_3 = white_2;
+        white_2 = white_1;
+        white_1 = y;
+      }
+
+      if (y - 5 > white_3)
+      {
+        cout << "Yes" << endl;
+        return 0;
+      }
+    }
+  }
+
+  for (int i = -n; i < n; i++)
+  {
+    int white_1 = -1, white_2 = -1, white_3 = -1;
+    for (int j = 0; j < n; j++)
+    {
+      if (i + j >= 0 && i + j < n)
+      {
+        if (s[i + j][j] == false)
+        {
+          white_3 = white_2;
+          white_2 = white_1;
+          white_1 = j;
+        }
+
+        if (j - 5 > white_3)
+        {
+          cout << "Yes" << endl;
+          return 0;
+        }
+      }
+      else
+      {
+        white_3 = j;
+        white_2 = j;
+        white_1 = j;
+      }
+    }
+  }
+
+  for (int i = -n; i < n; i++)
+  {
+    int white_1 = -1, white_2 = -1, white_3 = -1;
+    for (int j = 0; j < n; j++)
+    {
+      if (i + j >= 0 && i + j < n)
+      {
+        if (s[i + j][n - j - 1] == false)
+        {
+          white_3 = white_2;
+          white_2 = white_1;
+          white_1 = j;
+        }
+
+        if (j - 5 > white_3)
+        {
+          cout << "Yes" << endl;
+          return 0;
+        }
+      }
+      else
+      {
+        white_3 = j;
+        white_2 = j;
+        white_1 = j;
+      }
+    }
+  }
+
+  cout << "No" << endl;
 }
diff --git a/d.cpp b/d.cpp
index c97653d..3f56111 100644
--- a/d.cpp
+++ b/d.cpp
@@ -5,5 +5,52 @@ using namespace atcoder;
 
 int main()
 {
-  cout << "hello,world" << endl;
+  int q;
+  multiset<uint64_t> a;
+  cin >> q;
+
+  for (int i = 0; i < q; i++)
+  {
+    int type, x, k;
+    cin >> type >> x;
+    if (type != 1)
+      cin >> k;
+
+    multiset<uint64_t>::iterator iter;
+    switch (type)
+    {
+    case 1:
+      a.insert(x);
+      break;
+
+    case 2:
+      iter = a.upper_bound(x);
+      for (int j = 0; j < k; j++)
+      {
+        if (iter == a.begin())
+          goto dbreak;
+        *iter--;
+      }
+      cout << *iter << endl;
+      break;
+
+    case 3:
+      iter = a.lower_bound(x);
+      if (iter == a.end())
+        goto dbreak;
+      for (int j = 0; j < k - 1; j++)
+      {
+        *iter++;
+        if (iter == a.end())
+          goto dbreak;
+      }
+      cout << *iter << endl;
+      break;
+
+    dbreak:
+    default:
+      cout << -1 << endl;
+      break;
+    }
+  }
 }