Digit Generator UVa1583

#include <iostream>
using namespace std;
//求一个数的长度
int lent(int n) {
if (n < 10)	return 1;
return 1 + lent(n / 10);
}
#define MIN(n) (lent(n)) * 9
int main(void) {
int n;
while (cin >> n) {
bool isFinded = false;
for (int i = MIN(n); i < n; i++) {
int RS = i;
int temp = i;
while (temp > 0) {
RS += temp % 10;
temp /= 10;
}
if (RS == n) {
isFinded = true;
cout << i << endl;
break;
}
}
if(!isFinded)
cout << 0 << endl;
}
}