Added codes for 1 Feb

GeeksForGeeks/February/1-2-24/GFG.java

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+//{ Driver Code Starts
+//Initial template for JAVA
+
+import java.lang.*;
+import java.io.*;
+import java.util.*;
+
+
+// } Driver Code Ends
+//User function template for JAVA
+
+class Solution
+{
+    //Function to check if a string is Pangram or not.
+    public static boolean checkPangram  (String str) 
+    {
+        // your code here
+        Set<Character> set = new HashSet<>();
+
+        for (char ch : str.toCharArray()) 
+        {
+            if (ch >= 'a' && ch <= 'z')
+                set.add(ch);
+
+            if (ch >= 'A' && ch <= 'Z') 
+            {
+                ch = Character.toLowerCase(ch);
+                set.add(ch);
+            }
+        }
+
+        return set.size() == 26;
+    }
+}
+
+//{ Driver Code Starts.
+
+class GFG
+ {
+	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().trim();
+
+	    System.out.println(new Solution().checkPangram (s)==true?1:0);
+	  }
+
+	 }
+}
+// } Driver Code Ends

GeeksForGeeks/February/1-2-24/README.md

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

LeetCode/February/1-2-24/README.md

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+Time complexity - O(nlogn) or O(sort)
+Space complexity - O(n)

LeetCode/February/1-2-24/Solution.java

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+class Solution 
+{
+    public int[][] divideArray(int[] nums, int k) 
+    {
+        int[][] ans = new int[nums.length / 3][3];
+
+        Arrays.sort(nums);
+
+        for (int i = 2; i < nums.length; i += 3) 
+        {
+            if (nums[i] - nums[i - 2] > k)
+                return new int[0][];
+
+            ans[i / 3] = new int[] {nums[i - 2], nums[i - 1], nums[i]};
+        }
+
+        return ans;
+    }
+}