Added codes for 6 March

GeeksForGeeks/March/06-3-24/GFG.java

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+//{ Driver Code Starts
+//Initial Template for Java
+
+import java.io.*;
+import java.util.*;
+
+class GFG
+{
+    public static void main(String args[])throws IOException
+    {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+        while(t-- > 0)
+        {
+            String s, patt;
+            s = sc.next();
+            patt = sc.next();
+
+            Solution ob = new Solution();
+
+            ArrayList<Integer> res = ob.search(patt, s);
+
+            for(int i = 0;i<res.size();i++)
+                System.out.print(res.get(i) + " ");
+            System.out.println();    
+        }
+    }
+}
+// } Driver Code Ends
+
+
+//User function Template for Java
+
+class Solution
+{
+    ArrayList<Integer> search(String pat, String txt)
+    {
+        // your code here
+        ArrayList<Integer> indices = new ArrayList<>();
+        int m = pat.length();
+        int n = txt.length();
+        int[] lps = computeLPSArray(pat);
+        int i = 0; 
+        int j = 0;
+        while (i < n) 
+        {
+            if (pat.charAt(j) == txt.charAt(i)) 
+            {
+                i++;
+                j++;
+            }
+            if (j == m) 
+            {
+                indices.add(i - j + 1);
+                j = lps[j - 1];
+            }
+            else if (i < n && pat.charAt(j) != txt.charAt(i)) 
+            {
+                if (j != 0) 
+                {
+                    j = lps[j - 1];
+                }
+                else 
+                {
+                    i++;
+                }
+            }
+        }
+        return indices;
+    }
+
+
+    private int[] computeLPSArray(String pat) 
+    {
+        int m = pat.length();
+        int[] lps = new int[m];
+        int len = 0;
+        for (int i = 1; i < m; ) 
+        {
+            if (pat.charAt(i) == pat.charAt(len)) 
+            {
+                len++;
+                lps[i] = len;
+                i++;
+            }
+            else 
+            {
+                if (len != 0) 
+                {
+                    len = lps[len - 1];
+                }
+                else
+                {
+                    lps[i] = 0;
+                    i++;
+                }
+            }
+        }
+        return lps;
+    }
+}

GeeksForGeeks/March/06-3-24/README.md

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+Time complexity - O(|text| + |pattern|)
+Space complexity - O(1)

LeetCode/March/06-3-24/README.md

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

LeetCode/March/06-3-24/Solution.java

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+/**
+ * Definition for singly-linked list.
+ * class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode(int x) {
+ *         val = x;
+ *         next = null;
+ *     }
+ * }
+ */
+public class Solution 
+{
+    public boolean hasCycle(ListNode head) 
+    {
+        ListNode slow = head;
+        ListNode fast = head;
+
+        while (fast != null && fast.next != null) 
+        {
+            slow = slow.next;
+            fast = fast.next.next;
+            if (slow == fast)
+                return true;
+        }
+
+        return false;
+    }
+}