Added codes for 16 May

GeeksForGeeks/May/16-5-24/GFG.java

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+//{ Driver Code Starts
+import java.io.*;
+import java.util.*;
+
+class IntMatrix {
+    public static int[][] input(BufferedReader br, int n, int m) throws IOException {
+        int[][] mat = new int[n][];
+
+        for (int i = 0; i < n; i++) {
+            String[] s = br.readLine().trim().split(" ");
+            mat[i] = new int[s.length];
+            for (int j = 0; j < s.length; j++) mat[i][j] = Integer.parseInt(s[j]);
+        }
+
+        return mat;
+    }
+
+    public static void print(int[][] m) {
+        for (var a : m) {
+            for (int e : a) System.out.print(e + " ");
+            System.out.println();
+        }
+    }
+
+    public static void print(ArrayList<ArrayList<Integer>> m) {
+        for (var a : m) {
+            for (int e : a) System.out.print(e + " ");
+            System.out.println();
+        }
+    }
+}
+
+class GFG {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int t;
+        t = Integer.parseInt(br.readLine());
+        while (t-- > 0) {
+
+            int n;
+            n = Integer.parseInt(br.readLine());
+
+            int[][] edges = IntMatrix.input(br, n - 1, 2);
+
+            Solution obj = new Solution();
+            int res = obj.minimumEdgeRemove(n, edges);
+
+            System.out.println(res);
+        }
+    }
+}
+
+// } Driver Code Ends
+
+
+
+class Solution 
+{
+    public int minimumEdgeRemove(int n, int[][] edges) 
+    {
+        // code here
+        Map<Integer, List<Integer>> map = new HashMap<>();
+        for(int i=1; i<=n+1; i++)
+            map.put(i, new ArrayList<>());
+
+        for(int [] edge : edges)
+        {
+            List<Integer> list = map.getOrDefault(edge[0], new ArrayList<>());
+            list.add(edge[1]);
+            map.put(edge[0], list);
+            list = map.getOrDefault(edge[1], new ArrayList<>());
+            list.add(edge[0]);
+            map.put(edge[1], list);
+        } 
+
+        boolean [] vis = new boolean[n+1];
+        int [] ans = new int[1];
+
+        dfs(1, map, vis, ans);
+
+        return ans[0];
+    }
+
+
+    private int dfs(int root, Map<Integer, List<Integer>> map, boolean[] vis, int[] ans)
+    {
+        vis[root] = true;
+        int len = 1;
+        for(int child : map.get(root))
+        {
+            if(vis[child] == false)
+            {
+                int res = dfs(child, map, vis, ans);
+
+                if(res % 2 == 0)
+                    ans[0]++;
+                else
+                    len += res;
+            }
+        }
+
+        return len;
+    }
+}

GeeksForGeeks/May/16-5-24/README.md

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

LeetCode/May/16-5-24/README.md

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

LeetCode/May/16-5-24/Solution.java

@@ -0,0 +1,28 @@
+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode() {}
+ *     TreeNode(int val) { this.val = val; }
+ *     TreeNode(int val, TreeNode left, TreeNode right) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+class Solution 
+{
+    public boolean evaluateTree(TreeNode root) 
+    {
+        if (root.val < 2)
+            return root.val == 1;
+        // OR
+        if (root.val == 2)
+            return evaluateTree(root.left) || evaluateTree(root.right);
+        // AND
+        return evaluateTree(root.left) && evaluateTree(root.right);
+    }
+}