Added codes for 22 Jan

GeeksForGeeks/22-1-24/GFG.java

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+//{ Driver Code Starts
+import java.util.*;
+import java.io.*;
+
+class Node {
+    int data;
+    Node left;
+    Node right;
+    Node(int data) {
+        this.data = data;
+        left = null;
+        right = null;
+    }
+} 
+
+public class GfG {
+    public static Node buildTree(String str) {
+
+        if (str.length() == 0 || str.charAt(0) == 'N') {
+            return null;
+        }
+
+        String ip[] = str.split(" ");
+        // Create the root of the tree
+        Node root = new Node(Integer.parseInt(ip[0]));
+        // Push the root to the queue
+
+        Queue<Node> queue = new LinkedList<>();
+
+        queue.add(root);
+        // Starting from the second element
+
+        int i = 1;
+        while (queue.size() > 0 && i < ip.length) {
+
+            // Get and remove the front of the queue
+            Node currNode = queue.peek();
+            queue.remove();
+
+            // Get the current node's value from the string
+            String currVal = ip[i];
+
+            // If the left child is not null
+            if (!currVal.equals("N")) {
+
+                // Create the left child for the current node
+                currNode.left = new Node(Integer.parseInt(currVal));
+                // Push it to the queue
+                queue.add(currNode.left);
+            }
+
+            // For the right child
+            i++;
+            if (i >= ip.length) break;
+
+            currVal = ip[i];
+
+            // If the right child is not null
+            if (!currVal.equals("N")) {
+
+                // Create the right child for the current node
+                currNode.right = new Node(Integer.parseInt(currVal));
+
+                // Push it to the queue
+                queue.add(currNode.right);
+            }
+            i++;
+        }
+
+        return root;
+    }
+
+
+    public static void main(String[] args)
+    {
+        Scanner scn=new Scanner(System.in);
+
+        int t = Integer.parseInt(scn.nextLine()); 
+
+        while (t-- > 0) 
+        {
+            int s = Integer.parseInt(scn.nextLine());
+            // sc.nextLine();
+            String res = scn.nextLine();
+            // sc.nextLine();
+            Node root = buildTree(res);
+
+            Solution ob=new Solution();
+            ArrayList<ArrayList<Integer>> ans= ob.printPaths(root, s);
+
+            Collections.sort(ans, new ElementWiseComparator());
+
+            for(int i=0;i<ans.size();i++)
+            {
+                for(int j=0;j<ans.get(i).size();j++)
+                {
+                    System.out.print(ans.get(i).get(j) + " ");
+                }
+                System.out.println(" ");
+            }
+        }
+    }
+
+    static class ElementWiseComparator implements Comparator<ArrayList<Integer>> {
+        @Override
+        public int compare(ArrayList<Integer> list1, ArrayList<Integer> list2) {
+            int minLength = Math.min(list1.size(), list2.size());
+
+            for (int i = 0; i < minLength; i++) {
+                int comparison = Integer.compare(list1.get(i), list2.get(i));
+                if (comparison != 0) {
+                    return comparison;
+                }
+            }
+
+            return Integer.compare(list1.size(), list2.size());
+        }
+    }
+}
+// } Driver Code Ends
+
+
+//User function Template for Java
+
+/*Tree Node
+class Node {
+    int data;
+    Node left;
+    Node right;
+    Node(int data) {
+        this.data = data;
+        left = null;
+        right = null;
+    }
+} 
+*/
+
+class Solution
+{
+    public static ArrayList<ArrayList<Integer>> printPaths(Node root, int sum)
+    {
+        // code here
+        ArrayList<ArrayList<Integer>> ans =new ArrayList<>(); 
+        solve(root, 0, sum, new ArrayList<Integer>(), ans); 
+        return ans; 
+    }
+
+    public static void solve(Node rt, int cur, int sum, ArrayList<Integer> a, ArrayList<ArrayList<Integer>> ans){
+        if(rt==null)
+            return; 
+
+        cur+=rt.data; 
+        a.add(rt.data); 
+
+        if(cur==sum)
+        {
+            ArrayList<Integer> res = new ArrayList<>(); 
+
+            for(int k: a)
+                res.add(k); 
+
+            ans.add(res); 
+        }
+
+        solve(rt.left, cur, sum, a, ans); 
+        solve(rt.right, cur,sum,a,ans); 
+
+        a.remove(a.size()-1); 
+    }
+}

GeeksForGeeks/22-1-24/README.md

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+Time complexity - O(n^2)
+Space complexity - O(n)

LeetCode/22-1-24/README.md

@@ -0,0 +1,2 @@
+Time complexity - O(n)
+Space complexity - O(1)

LeetCode/22-1-24/Solution.java

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+class Solution {
+    public int[] findErrorNums(int[] nums)
+	{
+		int i=0;
+		while(i<nums.length)
+		{
+			int correct = nums[i]-1;
+			if(i < nums.length && nums[i] != nums[correct])
+				swap(nums, i, correct);
+			else
+				i++;
+		}
+
+		for (int j=0; j<nums.length; j++)
+		{
+			if (nums[j] != j+1)
+				return new int[] {nums[j], j+1};
+		}
+
+		return new int[] {-1,-1};
+	}
+
+
+	public void swap(int[] arr, int first, int second)
+	{
+		int temp = arr[first];
+		arr[first] = arr[second];
+		arr[second] = temp;
+	}
+}