解题思路:
注意事项:
参考代码:
import java.util.Arrays; import java.util.Scanner; public class main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int a = scanner.nextInt(); int b[] = new int[4]; int d = 0; while (true) { int a1 = 0; int a2 = 0; for (int i = 0; i < 4; i++) { b[i] = a % 10; a = a / 10; } Arrays.sort(b);// 从小到大 for (int i = 0; i < b.length; i++) { a1 = a1 * 10 + b[i]; a2 = a2 * 10 + b[3 - i]; } a = a2 - a1; d++; if (a == 6174) { System.out.println(d); break; } } } }
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