From 59ae85f8ca9f7d817d6b195d8503e112438d77d6 Mon Sep 17 00:00:00 2001
From: Thejaswin <52855622+thejaswin123@users.noreply.github.com>
Date: Sun, 18 Oct 2020 12:15:44 +0530
Subject: [PATCH] Create difftree.cpp

---
 tree/difftree.cpp | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 tree/difftree.cpp

diff --git a/tree/difftree.cpp b/tree/difftree.cpp
new file mode 100644
index 00000000..04a8a5fc
--- /dev/null
+++ b/tree/difftree.cpp
@@ -0,0 +1,66 @@
+#include<bits/stdc++.h>
+using namespace std;
+int maximum(int a,int b);
+void initialiseSets(vector<int> &parent, vector<int> &size, multiset<int> &sizesOfSets,int n)
+{
+ for(int i = 1;i <= n;i++)
+    {
+  parent[i] = i;
+  size[i] = 1;
+  sizesOfSets.insert(1);
+    }
+}
+
+int findParent(int camper, vector<int> &parent)
+{
+ if(parent[camper] == camper) return camper;
+ return parent[camper] = findParent(parent[camper], parent);
+}
+
+void setUnion(int camper1,int camper2, vector<int> &parent, vector<int> &size, multiset<int> &sizesOfSets)
+{
+ int parent1 = findParent(camper1,parent);
+ int parent2 = findParent(camper2,parent);
+ if(parent1 != parent2)
+    {
+  parent[parent1] = parent2;
+  sizesOfSets.erase(sizesOfSets.find(size[parent1]));
+  sizesOfSets.erase(sizesOfSets.find(size[parent2]));
+  size[parent2] += size[parent1];
+  sizesOfSets.insert(size[parent2]);
+ }
+}
+
+vector<int> findSolution(vector< pair<int,int> > &queries, int n)
+{
+vector<int> parent(n+1);
+vector<int> size(n+1);
+multiset<int> sizesOfSets;
+
+initialiseSets(parent,size,sizesOfSets,n);
+
+int numberOfQueries = queries.size();
+vector<int> ans;
+for(int i = 0;i < numberOfQueries;i++) {
+ int camper1 = queries[i].first;
+ int camper2 = queries[i].second;
+ setUnion(camper1,camper2,parent,size,sizesOfSets);
+ ans.push_back(*(--sizesOfSets.end()) - *sizesOfSets.begin());
+}
+return ans;
+}
+int main() {
+    int i,j,k,l,m,n,t,q;
+    cin >> n >> q;
+    vector< pair<int,int> > queries;
+    while(q--) {
+        int u,v;
+        cin >> u >> v;
+        queries.push_back({u,v});
+    }
+    vector<int> ans = findSolution(queries,n);
+    for(int an : ans) {
+        cout << an << endl;
+    }
+   
+}