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import java.util.Scanner; public class Main { // Function to calculate the maximum prize public static int calculatePrize(int cards, int exchanges) { char[] numArray = String.valueOf(cards).toCharArray(); // Convert the number to a character array int[] maxPrize = new int[1]; // Store the maximum prize backtrack(numArray, exchanges, maxPrize, 0); return maxPrize[0]; } // Backtracking function to generate all possible permutations and update the maximum prize public static void backtrack(char[] numArray, int exchanges, int[] maxPrize, int currentIndex) { if (exchanges == 0) { int currentPrize = Integer.parseInt(new String(numArray)); maxPrize[0] = Math.max(maxPrize[0], currentPrize); return; } for (int i = currentIndex; i < numArray.length; i++) { for (int j = i + 1; j < numArray.length; j++) { // Swap the digits at positions i and j char temp = numArray[i]; numArray[i] = numArray[j]; numArray[j] = temp; // Continue backtracking with decreased exchanges backtrack(numArray, exchanges - 1, maxPrize, i); // Revert the swap temp = numArray[i]; numArray[i] = numArray[j]; numArray[j] = temp; } } } public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Read the number of test cases int numTestCases = scanner.nextInt(); scanner.nextLine(); // Consume newline // Iterate over each test case for (int caseNum = 1; caseNum <= numTestCases; caseNum++) { // Read the number cards and the number of exchanges int numberCards = scanner.nextInt(); int numExchanges = scanner.nextInt(); scanner.nextLine(); // Consume newline // Calculate the maximum prize for this test case int maxPrize = calculatePrize(numberCards, numExchanges); // Print the result System.out.println("Case #" + caseNum); System.out.println(maxPrize); } scanner.close(); } }
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