Added codes for 25 Jan

GeeksForGeeks/25-1-24/GFG.java

@@ -0,0 +1,103 @@
+//{ Driver Code Starts
+//Initial Template for Java
+import java.io.*;
+import java.util.*;
+
+// } Driver Code Ends
+//User function Template for Java
+
+
+class Pair
+{
+    int first;
+    int second;
+    Pair(int first,int second)
+    {
+        this.first=first;
+        this.second=second;
+    }
+}
+
+class Solution
+{
+    int solve(int num1,int num2)
+    {
+        //code here
+        if(num1==num2)
+            return 0;
+
+        boolean []prime=new boolean[10000];
+        Arrays.fill(prime,true);
+
+        prime[1]=false;
+
+        for(int i=2;i<=9999;i++)
+        {
+            if(prime[i])
+            {
+                for(int j=i*i;j<=9999;j+=i)
+                {
+                    prime[j]=false;
+                }
+            }
+        }
+
+        Queue<Pair> queue=new LinkedList<>();
+        queue.add(new Pair(num1,0));
+
+        boolean []vis=new boolean[10000];
+
+        while(!queue.isEmpty())
+        {
+            int num=queue.peek().first;
+            int step=queue.peek().second;
+            queue.poll();
+
+            if(num==num2)
+                return step;
+
+            if(vis[num])
+                continue;
+
+            vis[num]=true;
+
+            String str=Integer.toString(num);
+
+            for(int i=0;i<4;i++)
+            {
+                for(char j='0';j<='9';j++)
+                {
+                    if((i==0 && j=='0') || j==str.charAt(i))
+                        continue;
+                    else
+                    {
+                        String newStr=str.substring(0,i)+j+str.substring(i+1);
+                        int val=Integer.valueOf(newStr);
+                        if(prime[val])
+                            queue.add(new Pair(val,step+1));
+                    }
+                }
+            }
+        }
+        return -1;
+    }
+}
+
+
+//{ Driver Code Starts.
+class GFG{
+    public static void main(String args[]) throws IOException{
+        BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
+        int t = Integer.parseInt(read.readLine());
+        while(t-- > 0)
+        {
+            String input_line[] = read.readLine().trim().split("\\s+");
+            int Num1=Integer.parseInt(input_line[0]);
+            int Num2=Integer.parseInt(input_line[1]);
+
+            Solution ob = new Solution();
+            System.out.println(ob.solve(Num1,Num2));
+        }
+    }
+}
+// } Driver Code Ends

GeeksForGeeks/25-1-24/README.md

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

LeetCode/25-1-24/README.md

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

LeetCode/25-1-24/Solution.java

@@ -0,0 +1,18 @@
+class Solution 
+{
+    public int longestCommonSubsequence(String text1, String text2) 
+    {
+        final int m = text1.length();
+        final int n = text2.length();
+
+        int[][] dp = new int[m + 1][n + 1];
+
+        for (int i = 0; i < m; ++i)
+            for (int j = 0; j < n; ++j)
+                dp[i + 1][j + 1] = text1.charAt(i) == text2.charAt(j)
+                                        ? 1 + dp[i][j] 
+                                        : Math.max(dp[i][j + 1], dp[i + 1][j]);
+
+        return dp[m][n];
+    }
+}