upload

5/C.cpp

@@ -0,0 +1,297 @@
+#include <cstddef>
+#include <iostream>
+#include <string>
+#include <vector>
+
+typedef long long ll;
+
+struct Node {
+  Node* left_child = nullptr;
+  Node* right_child = nullptr;
+  ll right_count = 0;
+  ll value;
+
+  Node(ll value) : value(value){};
+
+  bool operator==(ll rhs) {
+    return value == rhs;
+  }
+
+  bool operator<(ll rhs) {
+    return value < rhs;
+  }
+
+  bool operator>(ll rhs) {
+    return value > rhs;
+  }
+
+  bool operator<=(ll rhs) {
+    return (*this < rhs) || (*this == rhs);
+  }
+
+  bool operator>=(ll rhs) {
+    return (*this > rhs) || (*this == rhs);
+  }
+};
+
+class BinarySearchTree {
+ public:
+  ~BinarySearchTree() {
+    DeleteNodes(root);
+  }
+  void PreorderTraversal() {
+    if (!root) {
+      return;
+    }
+    PreorderTraversal(root);
+  }
+
+  void InorderTraversal() {
+    if (!root) {
+      return;
+    }
+    InorderTraversal(root);
+  }
+
+  void PostorderTraversal() {
+    if (!root) {
+      return;
+    }
+    PostorderTraversal(root);
+  }
+
+  void AddChild(ll value) {
+    if (!root) {
+      root = new Node(value);
+      return;
+    }
+    AddChild(root, value);
+  }
+
+  void Construct(const std::vector<ll>& array) {
+    root = Construct(array, 0, array.size() - 1);
+  }
+
+  void GetNextValue(ll number) {
+    Node* node = root;
+    Node* next = nullptr;
+
+    while (node) {
+      if (*node > number) {
+        next = node;
+        node = node->left_child;
+      } else {
+        node = node->right_child;
+      }
+    }
+
+    if (!next) {
+      std::cout << "none" << std::endl;
+    } else {
+      std::cout << next->value << std::endl;
+    }
+  }
+
+  void GetPrevValue(ll number) {
+    Node* node = root;
+    Node* next = nullptr;
+
+    while (node) {
+      if (*node < number) {
+        next = node;
+        node = node->right_child;
+      } else {
+        node = node->left_child;
+      }
+    }
+
+    if (!next) {
+      std::cout << "none" << std::endl;
+    } else {
+      std::cout << next->value << std::endl;
+    }
+  }
+
+  void Find(ll value) {
+    std::cout << Find(root, value)->value << std::endl;
+  }
+
+  void Exists(ll value) {
+    std::cout << (Find(root, value) ? "true" : "false") << std::endl;
+  }
+
+  void Delete(ll value) {
+    root = Delete(root, value);
+  }
+  void KthMax(ll value) {
+    KthMax(root, value);
+  }
+
+ private:
+  void DeleteNodes(Node* node) {
+    if (!node) {
+      return;
+    }
+    DeleteNodes(node->left_child);
+    DeleteNodes(node->right_child);
+    delete node;
+  }
+
+  Node* AddChild(Node* node, ll value) {
+    if (!node) return new Node(value);
+
+    if (*node > value) {
+      node->left_child = AddChild(node->left_child, value);
+    } else if (*node < value) {
+      node->right_child = AddChild(node->right_child, value);
+      node->right_count++;
+    }
+
+    return node;
+  }
+
+  void PreorderTraversal(Node* node) {
+    if (!node) {
+      return;
+    }
+    std::cout << node->value << ' ';
+    PreorderTraversal(node->left_child);
+    PreorderTraversal(node->right_child);
+  }
+
+  void InorderTraversal(Node* node) {
+    if (!node) {
+      return;
+    }
+    InorderTraversal(node->left_child);
+    std::cout << node->value << ' ';
+    InorderTraversal(node->right_child);
+  }
+
+  void PostorderTraversal(Node* node) {
+    if (!node) {
+      return;
+    }
+    PostorderTraversal(node->left_child);
+    PostorderTraversal(node->right_child);
+    std::cout << node->value << ' ';
+  }
+
+  Node* Construct(const std::vector<ll>& array, ll start, ll end) {
+    if (start > end) return nullptr;
+
+    size_t mid = (start + end) / 2;
+    Node* node = new Node(array[mid]);
+
+    node->left_child = Construct(array, start, mid - 1);
+    node->right_child = Construct(array, mid + 1, end);
+
+    return node;
+  }
+
+  Node* Find(Node* node, ll value) {
+    if (!node || *node == value) {
+      return node;
+    }
+
+    if (*node > value) {
+      return Find(node->left_child, value);
+    } else {
+      return Find(node->right_child, value);
+    }
+  }
+
+  Node* Delete(Node* node, ll value) {
+    if (!node) {
+      return node;
+    }
+
+    if (*node > value) {
+      node->left_child = Delete(node->left_child, value);
+      return node;
+    } else if (*node < value) {
+      node->right_child = Delete(node->right_child, value);
+      node->right_count = node->right_child ? node->right_child->right_count + 1 : 0;
+      return node;
+    }
+
+    if (!node->left_child && !node->right_child) {
+      delete node;
+      return nullptr;
+    } else if (!node->left_child) {
+      Node* tmp = node->right_child;
+      delete node;
+      return tmp;
+    } else if (!node->right_child) {
+      Node* tmp = node->left_child;
+      delete node;
+      return tmp;
+    } else {
+      Node* next_parent = nullptr;
+      Node* next = node->right_child;
+
+      while (next->left_child) {
+        next_parent = next;
+        next = next->left_child;
+      }
+
+      if (next_parent) {
+        next_parent->left_child = next->right_child;
+      } else {
+        node->right_child = next->right_child;
+      }
+      node->value = next->value;
+      node->right_count = next->right_count;
+
+      delete next;
+      return node;
+    }
+  }
+
+  void KthMax(Node* node, ll k) {
+    if (!node) {
+      return;
+    }
+
+    if (k == node->right_count + 1) {
+      std::cout << node->value << '\n';
+      return;
+    }
+    if (k < node->right_count + 1) {
+      KthMax(node->right_child, k);
+    } else {
+      KthMax(node->left_child, k - node->right_count - 1);
+    }
+  }
+
+ private:
+  Node* root = nullptr;
+};
+
+ll GetValueFromStdin() {
+  ll temp;
+  std::cin >> temp;
+  return temp;
+}
+
+int main() {
+  BinarySearchTree bst;
+
+  ll n;
+  std::cin >> n;
+
+  for (ll i = 0; i < n; ++i) {
+    int command;
+    std::cin >> command;
+    if (command == 1) {
+      ll value = GetValueFromStdin();
+      bst.AddChild(value);
+    } else if (command == -1) {
+      ll value = GetValueFromStdin();
+      bst.Delete(value);
+    } else if (command == 0) {
+      ll value = GetValueFromStdin();
+      bst.KthMax(value);
+    }
+  }
+}