C语言版本实现回文数字

#include 
int main() {
    int n;
    scanf_s("%d", &n);
    int s = 0;
    if (n >= 10 && n <= 100) {
 for (int i = 10001; i <= 999999; ++i) {
     if (i >= 100001) {
  int a = i % 10;
  int f = i / 100000;
  if (a != f) {
      continue;
  }
  int b = i / 10 % 10;
  int e = i / 10000 % 10;
  if (b != e) {
      continue;
  }
  int c = i / 1000 % 10;
  int d = i / 100 % 10;
  if (c != d) {
      continue;
  }
  if ((a << 1) + (b << 1) + (c << 1) == n) {
      s = 1;
      printf("%dn", i);
  }

     }
     else {
  int a = i % 10;
  int e = i / 10000;
  if (a != e) {
      continue;
  }
  int b = i / 10 % 10;
  int d = i / 1000 % 10;
  if (b != d) {
      continue;
  }
  int c = i / 100 % 10;
  if ((a << 1) + (b << 1) + c == n) {
      s = 1;
      printf("%dn", i);
  }

     }
 }
    }
    if (!s) {
 printf("%dn", -1);
    }
    return 0;
}