编程思路:
枚举加判断。
代码实现:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt();// for(int i = 10000 ; i < 100000 ; i++){ int a = i/10000; int b = i000/1000; int c = i00/100; int d = i0/10; int e = i; if(a == e & b == d & (a+b+c+d+e)==n) { System.out.println(i); } } for (int i = 100000; i < 1000000; i++) { int a = i/100000; int b = i0000/10000; int c = i000/1000; int d = i00/100; int e = i0/10; int f = i; if(a == f & b == e & c == d & (a+b+c+d+e+f)==n ) { System.out.println(i); } } } }