Added codes for 26 March

GeeksForGeeks/March/26-3-24/GFG.java

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+//{ Driver Code Starts
+import java.util.*;
+
+public class GFG {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+        while (t-- > 0) {
+            String s = sc.next();
+            Solution ss = new Solution();
+            boolean result = ss.isAdditiveSequence(s);
+            System.out.println((result == true ? 1 : 0));
+        }
+        sc.close();
+    }
+}
+// } Driver Code Ends
+
+
+// User function Template for Java
+class Solution 
+{
+    public boolean isAdditiveSequence(String n) 
+    {
+        // code here
+        int m = (int)Math.min(18,n.length());
+
+        for(int i=0;i<m;i++)
+        {
+            int k = 0;
+            for(int j=i+1;j<m;j++)
+            {
+                long a = Long.parseLong(n.substring(k,i+1));
+                long b = Long.parseLong(n.substring(i+1,j+1));
+                long sum = a+b;
+                int l = (sum+"").length();
+
+                if(n.substring(j+1).length()>=l)
+                {
+                    if(Long.parseLong(n.substring(j+1,j+l+1))==sum)
+                    {
+                        i = j;
+                        k = i;
+                        j = j+l-1;
+
+                        if(j+1==m-1)
+                            return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+}

GeeksForGeeks/March/26-3-24/README.md

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+Time complexity - O(n^2)
+Space complexity - O(1)

LeetCode/March/26-3-24/README.md

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

LeetCode/March/26-3-24/Solution.java

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+class Solution 
+{
+    public int firstMissingPositive(int[] nums) 
+    {
+        int n = nums.length;
+
+        for (int i = 0; i < n; ++i)
+            while (nums[i] > 0 && nums[i] <= n && nums[i] != nums[nums[i] - 1])
+                swap(nums, i, nums[i] - 1);
+
+        for (int i = 0; i < n; ++i)
+            if (nums[i] != i + 1)
+                return i + 1;
+
+        return n + 1;
+    }
+
+    private void swap(int[] nums, int i, int j) 
+    {
+        int temp = nums[i];
+        nums[i] = nums[j];
+        nums[j] = temp;
+    }
+}