Leimasin

import java.util.*;

public class leimasin3 {


	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);

		//int t = input.nextInt();

		String numbersLine = input.nextLine();
		String[] numberParts = numbersLine.split("\\s+");

		int n = Integer.parseInt(numberParts[0]);  // merkkijonon pituus
        int m = Integer.parseInt(numberParts[1]);  // leimasin pituus
		int k = Integer.parseInt(numberParts[2]);  // leimausten maara
		
		String stamp = input.nextLine();

		String line2 = input.nextLine();
		String[] parts = line2.split("\\s+");

		int[] numbers = new int[parts.length];

		for (int i = 0; i < parts.length; i++) {
            numbers[i] = Integer.parseInt(parts[i]);
        }
		
		input.close(); 
		
		// Program here

		int ans = 0;

		
		char[] jono = new char[n];
		
		Arrays.fill(jono, '.'); 

		String jono2 = new String(jono);


		// remove duplicates
		
		Set<Integer> seen = new HashSet<>();
		List<Integer> resultList = new ArrayList<>();

        for (int i = numbers.length - 1; i >= 0; i--) {
            if (!seen.contains(numbers[i])) {
                resultList.add(0, numbers[i]); 
                seen.add(numbers[i]);
            }
        }
		
	
		

		for (int num : resultList) {  // leimausten maara
            
			int alku = num - 1;
			int loppu = alku + m;
			
			jono2 = jono2.substring(0, alku) + stamp + jono2.substring(loppu);

        }  // leimausten maara


		System.out.println(jono2);


    }
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: ACCEPTED

Test 6

Group: 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: ACCEPTED