alr

2026-05-18 20:03:32 +05:30
commit 796dec1af7
17 changed files with 474 additions and 0 deletions
@@ -0,0 +1,50 @@
+import java.util.*;
+public class horsePool{
+    static HashMap<Character, Integer> shift = new HashMap<>();
+    static void shiftTable(String pattern){
+        for(char ch = 'A'; ch<='Z';ch++)
+            shift.put(ch, pattern.length());
+        shift.put(' ', pattern.length());
+        for(int i =0;i<pattern.length()-1;i++)
+            shift.put(pattern.charAt(i), pattern.length()-1-i);
+    }
+
+    static int search(String text, String pattern){
+        int n = text.length();
+        int m = pattern.length();
+
+        int i = m-1;
+        while(i<n){
+            int k = 0;
+            while(k<m && pattern.charAt(m-1-k)== text.charAt(i-k)){
+                k++;
+                
+            }
+            if(k==m){
+                return i-m+1;
+            }
+            i+=shift.getOrDefault(text.charAt(i), m);
+        }
+        return -1;
+    }
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        System.out.print("\nEnter text: ");
+        String text = sc.nextLine().toUpperCase();
+
+        System.out.print("\nENter pattern: ");
+        String pattern = sc.nextLine().toUpperCase();
+
+        shiftTable(pattern);
+        int pos = search(text, pattern);
+        if(pos!=-1){
+            System.out.println("Pattern found at index "+ pos);
+
+        }else{
+            System.out.println("Pattern not found");
+        }
+        sc.close();
+
+    }
+
+}