Create maxSumNonAdacentNode.cpp

C++/maxSumNonAdjacentNodes.cpp

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+// { Driver Code Starts
+//Initial Template for C++
+
+#include<bits/stdc++.h> 
+using namespace std; 
+
+// Tree Node
+struct Node
+{
+    int data;
+    Node* left;
+    Node* right;
+};
+
+// Utility function to create a new Tree Node
+Node* newNode(int val)
+{
+    Node* temp = new Node;
+    temp->data = val;
+    temp->left = NULL;
+    temp->right = NULL;
+
+    return temp;
+}
+
+// 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 = newNode(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 = newNode(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 = newNode(stoi(currVal));
+
+            // Push it to the queue
+            queue.push(currNode->right);
+        }
+        i++;
+    }
+
+    return root;
+}
+
+
+ // } Driver Code Ends
+//User function Template for C++
+
+//Node Structure
+/*
+struct Node
+{
+    int data;
+    Node* left;
+    Node* right;
+};
+*/
+
+class Solution{
+  public:
+    //Function to return the maximum sum of non-adjacent nodes.
+    pair<int,int> solve(Node* root) {
+        //base case
+        if(root == NULL) {
+            pair<int,int> p = make_pair(0,0);
+            return p;
+        }
+
+        pair<int,int> left = solve(root->left);
+        pair<int,int> right = solve(root->right);
+
+        pair<int,int> res;
+
+        res.first = root->data + left.second + right.second;
+
+        res.second = max(left.first, left.second) + max(right.first, right.second);
+
+        return res;
+
+    }
+    int getMaxSum(Node *root) 
+    {
+        pair<int,int> ans = solve(root);
+        return max(ans.first, ans.second);
+    }
+};
+
+// { Driver Code Starts.
+
+// Driver code 
+int main()
+{
+  int t;
+  scanf("%d ",&t);
+  while (t--)
+  {
+        string s;
+		getline(cin,s);
+		Node* root = buildTree(s);
+		Solution ob;
+        cout<<ob.getMaxSum(root)<<endl;
+  }
+  return 0;
+}  // } Driver Code Ends