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Use an ArrayList<ArrayList<Integer>> in Java
From my HackerRank solutions.
import java.util.Scanner; import java.util.ArrayList; public class Solution { public static void main(String[] args) { Scanner scan = new Scanner(System.in); int N = scan.nextInt(); int Q = scan.nextInt(); int lastAns = 0; /* Create 2-D ArrayList */ ArrayList<ArrayList<Integer>> lists = new ArrayList<>(); for (int i = 0; i < N; i++) { lists.add(new ArrayList<Integer>()); } /* Perform Q Queries */ for (int i = 0; i < Q; i++) { int q = scan.nextInt(); int x = scan.nextInt(); int y = scan.nextInt(); ArrayList<Integer> seq = lists.get((x ^ lastAns) % N); if (q == 1) { seq.add(y); } else if (q == 2) { lastAns = seq.get(y % seq.size()); System.out.println(lastAns); } } scan.close(); } }
Let me know if you have any questions.
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Dynamic Array
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Java solution - passes 100% of test cases
Use an ArrayList<ArrayList<Integer>> in Java
From my HackerRank solutions.
Let me know if you have any questions.