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MergeTwoBST's.cpp
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MergeTwoBST's.cpp
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// Given two BSTs, return elements of both BSTs in sorted form.
// { Driver Code Starts
#include <bits/stdc++.h>
using namespace std;
#define MAX_HEIGHT 100000
// Tree Node
struct Node {
int data;
Node *left;
Node *right;
Node(int val) {
data = val;
left = right = NULL;
}
};
// Function to Build Tree
Node* buildTree(string str)
{
// Corner Case
if(str.length() == 0 || str[0] == 'N')
return NULL;
// Creating vector of strings from input
// string after spliting by space
vector<string> ip;
istringstream iss(str);
for(string str; iss >> str; )
ip.push_back(str);
// Create the root of the tree
Node* root = new Node(stoi(ip[0]));
// Push the root to the queue
queue<Node*> queue;
queue.push(root);
// Starting from the second element
int i = 1;
while(!queue.empty() && i < ip.size()) {
// Get and remove the front of the queue
Node* currNode = queue.front();
queue.pop();
// Get the current node's value from the string
string currVal = ip[i];
// If the left child is not null
if(currVal != "N") {
// Create the left child for the current node
currNode->left = new Node(stoi(currVal));
// Push it to the queue
queue.push(currNode->left);
}
// For the right child
i++;
if(i >= ip.size())
break;
currVal = ip[i];
// If the right child is not null
if(currVal != "N") {
// Create the right child for the current node
currNode->right = new Node(stoi(currVal));
// Push it to the queue
queue.push(currNode->right);
}
i++;
}
return root;
}
// } Driver Code Ends
/*
struct Node {
int data;
Node *left;
Node *right;
Node(int val) {
data = val;
left = right = NULL;
}
};
*/
class Solution
{
public:
void insert(Node *root, stack<Node*> &s){
while(root != NULL){
s.push(root);
root = root->left;
}
}
//Function to return a list of integers denoting the node
//values of both the BST in a sorted order.
vector<int> merge(Node *root1, Node *root2)
{
//Your code here
stack<Node*> s1;
stack<Node*> s2;
vector<int> ans;
insert(root1, s1);
insert(root2, s2);
while(!s1.empty() || !s2.empty()){
int x = (!s1.empty() ? s1.top()->data : INT_MAX);
int y = (!s2.empty() ? s2.top()->data : INT_MAX);
if(x <= y){
ans.push_back(x);
Node *temp = s1.top();
s1.pop();
insert(temp->right, s1);
}else{
ans.push_back(y);
Node *temp = s2.top();
s2.pop();
insert(temp->right, s2);
}
}
return ans;
}
};
// { Driver Code Starts.
int main() {
int t;
string tc;
getline(cin, tc);
t=stoi(tc);
while(t--)
{
string s;
getline(cin, s);
Node* root1 = buildTree(s);
getline(cin, s);
Node* root2 = buildTree(s);
// getline(cin, s);
Solution obj;
vector<int> vec = obj.merge(root1, root2);
for(int i=0;i<vec.size();i++)
cout << vec[i] << " ";
cout << endl;
///cout<<"~"<<endl;
}
return 0;
} // } Driver Code Ends