optimized sample solution

src/main/java/Solution.java

@@ -1,27 +1,34 @@
 import java.util.*;
-import java.io.*;
-import java.math.*;
-
-import org.apache.commons.collections4.*;
-import org.apache.commons.lang3.*;
-import org.apache.commons.math3.*;
 
 /**
- * Template code to help you parse the standard input 
+ * Template code to help you parse the standard input
  * according to the problem statement.
  **/
 class Solution {
-	
-	public static void main( String[] args ) {
-		// hint: read values via Scanner methods
-		Scanner in = new Scanner( System.in );
-		
-		// code your solution here
-		
-		// use error to write to console
-		System.err.println( "debug" );
-		
-		// Write result with System.out.println()
-		System.out.println( "value" );
-	}
+    
+    public static void main( String[] args ) {
+        // hint: read values via Scanner methods
+        var scanner = new Scanner( System.in );
+        
+        // code your solution here
+        Map<String, Integer> lastOccurrences = new HashMap<>();
+        
+        int startIndex = 0;
+        int maxLength  = 0;
+        int index      = 0;
+        
+        while ( scanner.hasNext() ) {
+            Integer previousOccurrence = lastOccurrences.put( scanner.next(), index++ );
+            if ( previousOccurrence != null ) {
+                if ( previousOccurrence >= startIndex ) {
+                    maxLength  = Math.max( maxLength, index - 1 - startIndex );
+                    startIndex = previousOccurrence + 1;
+                }
+            }
+        }
+        maxLength = Math.max( maxLength, index - startIndex );
+        
+        // Write result with System.out.println()
+        System.out.println( maxLength );
+    }
 }

src/test/resources/testdata.csv

@@ -2,6 +2,10 @@ a, 1
 a b, 2
 a a, 1
 f s f e t w e n w e, 5
+s f e t w s l o p q r, 10
+s f e t w s f e t l o, 7
+s f e t w s w t e f s, 5
+s f e t w s w t e f s l, 6
 k i u w y x f l e c g, 11
 b u e v l w u d t r a b q x a h x b y s y w w s k, 12
 z d k g x p a f h b c p y r y o r y k k o n u t h, 11