From b0cb34e532c7b94d04cda246d2080bafd86aad38 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 30 Mar 2021 20:09:44 +0800
Subject: import(solutions): Add acwing 2069.

---
 works/solutions/.gitignore      |  3 ++
 works/solutions/acwing/2069.cpp | 82 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 works/solutions/acwing/2069.cpp

(limited to 'works')

diff --git a/works/solutions/.gitignore b/works/solutions/.gitignore
index fd9075a..951dd99 100644
--- a/works/solutions/.gitignore
+++ b/works/solutions/.gitignore
@@ -2,3 +2,6 @@
 *.exe
 *.pdb
 *.ilk
+*.obj
+*.exp
+*.lib
diff --git a/works/solutions/acwing/2069.cpp b/works/solutions/acwing/2069.cpp
new file mode 100644
index 0000000..fbfa6d2
--- /dev/null
+++ b/works/solutions/acwing/2069.cpp
@@ -0,0 +1,82 @@
+#include <iostream>
+#include <vector>
+
+struct Node {
+  int m = 0;
+  Node *set;
+  Node *left = nullptr;
+  Node *right = nullptr;
+
+  Node() : set(this) {}
+
+  void SetParent(Node *parent, bool l) {
+    set = parent;
+    l ? parent->left = this : parent->right = this;
+  }
+
+  Node *GetSetRepresentative() {
+    Node *r = this;
+    while (r->set != r) {
+      r = r->set;
+    }
+    set = r;
+    return set;
+  }
+
+  bool has_dfs = false;
+
+  void Dfs() {
+    if (has_dfs)
+      return;
+    has_dfs = true;
+    if (left != nullptr)
+      left->Dfs(m);
+    if (right != nullptr)
+      right->Dfs(m);
+  }
+
+  void Dfs(int c) {
+    m += c;
+    if (left != nullptr)
+      left->Dfs(m);
+    if (right != nullptr)
+      right->Dfs(m);
+  }
+};
+
+Node nodes[10010];
+
+int main() {
+  std::ios_base::sync_with_stdio(false);
+  std::cin.tie(nullptr);
+
+  int n, m;
+
+  std::cin >> n >> m;
+
+  for (int i = 0; i < m; i++) {
+    int operation, a, b;
+    std::cin >> operation >> a >> b;
+
+    if (operation == 1) {
+      auto ra = nodes[a].GetSetRepresentative(),
+           rb = nodes[b].GetSetRepresentative();
+
+      if (ra != rb) {
+        auto node = new Node;
+        ra->SetParent(node, true);
+        rb->SetParent(node, false);
+      }
+    } else {
+      nodes[a].GetSetRepresentative()->m += b;
+    }
+  }
+
+  for (int i = 1; i <= n; i++) {
+    auto &node = nodes[i];
+    node.GetSetRepresentative()->Dfs();
+    std::cout << node.m << ' ';
+  }
+
+  return 0;
+}
-- 
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