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package JavaCollection; import java.util.ArrayList; import java.util.Scanner; public class NumbersArrayList { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter total number of lines:"); int lines = scanner.nextInt(); ArrayList<ArrayList<Integer>> rows = new ArrayList<>(); System.out.println("Enter the element count and elements per line"); for (int i = 0; i < lines; i++) { int numElements = scanner.nextInt(); ArrayList<Integer> row = new ArrayList<>(); for (int j = 0; j < numElements; j++) { int element = scanner.nextInt(); row.add(element); } rows.add(row); } System.out.print("Enter the query count:"); int queryCount = scanner.nextInt(); for (int m = 0; m < queryCount; m++) { System.out.print("Enter line and position of element to be found"); int queryLine = scanner.nextInt(); int queryPosition = scanner.nextInt(); if (queryPosition - 1 < rows.get(queryLine - 1).size()) { System.out.println(rows.get(queryLine - 1).get(queryPosition - 1)); } else { System.out.println("ERROR!"); } } } }
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