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 sc = new Scanner(System.in); int hui = sc.nextInt(); int count = 0; for (int i = 10000; i <= 999999; i++) { //判断是否是回文数 if (HW(i)) { //判断数字之和是否是n if (QH(i, hui)) { System.out.println(i); count++; } } } if (count==0) { System.out.println(-1); } } //判断是否是回文数函数 private static boolean HW(int a) { boolean b = true; String st = String.valueOf(a); int len = st.length(); for (int i = 0; i < len/2; i++) { if (st.charAt(i) != st.charAt(len-1-i)) { b = false; } } return b; } //判断数字之和是否是n函数 private static boolean QH(int a,int b) { char[] arr = String.valueOf(a).toCharArray(); int sum = 0; for (int i = 0; i < arr.length; i++) { sum += (arr[i]-'0'); } if (sum == b) { return true; } else { return false; } } }
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