Added codes for 31 March

GeeksForGeeks/March/31-3-24/GFG.java

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+//{ Driver Code Starts
+// Initial Template for Java
+
+import java.io.*;
+import java.util.*;
+import java.util.LinkedList;
+import java.util.Queue;
+
+class Node {
+    int key;
+    Node left;
+    Node right;
+
+    Node(int x) {
+        this.key = x;
+        left = null;
+        right = null;
+    }
+}
+
+class GfG {
+
+    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) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int t = Integer.parseInt(br.readLine());
+
+        while (t > 0) {
+            String s = br.readLine();
+            int N = Integer.parseInt(br.readLine());
+            Node root = buildTree(s);
+            Solution g = new Solution();
+            System.out.println(g.findMaxForN(root, N));
+            t--;
+        }
+    }
+}
+
+// } Driver Code Ends
+
+
+// User function Template for Java
+
+/*class Node
+{
+    int key;
+    Node left, right;
+
+    Node(int x)
+    {
+        key = x;
+        left = right = null;
+    }
+
+}*/
+class Solution 
+{
+    static int max=-1;
+
+    public static int findMaxForN(Node root, int n) 
+    {
+        traverse(root,n);
+        int ans = max;
+        max = -1;
+        return ans;
+    }
+
+    public static void traverse(Node root,int n)
+    {
+         if(root==null)
+            return;
+
+        traverse(root.left,n);
+        if(root.key>max&&root.key<=n)
+            max = root.key;
+
+        traverse(root.right,n);
+    }
+}

GeeksForGeeks/March/31-3-24/README.md

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

LeetCode/March/31-3-24/README.md

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+Time complexity - O(n)
+Space complexity - O(1)

LeetCode/March/31-3-24/Solution.java

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+class Solution 
+{
+    public long countSubarrays(int[] nums, int minK, int maxK) 
+    {
+        long ans = 0;
+        int j = -1;
+        int prevMinKIndex = -1;
+        int prevMaxKIndex = -1;
+
+        for (int i = 0; i < nums.length; ++i) 
+        {
+            if (nums[i] < minK || nums[i] > maxK)
+                j = i;
+            if (nums[i] == minK)
+                prevMinKIndex = i;
+            if (nums[i] == maxK)
+                prevMaxKIndex = i;
+            ans += Math.max(0, Math.min(prevMinKIndex, prevMaxKIndex) - j);
+        }
+
+        return ans;
+    }
+}