题目描述：

题目源链接：P1151 子数整数 – 洛谷 | 计算机科学教育新生态 (luogu.com.cn)

最终代码

#include <iostream>
using namespace std;
struct sub {
	int x, y, z;
}q[30001];
bool flag = 0;
int main() {
	int r;
	cin >> r;
	for (int i = 10000; i <= 30000; i++) {
		q[i].x = i / 100;
		q[i].y = (i / 10) % 1000;
		q[i].z = i % 1000;
        if (q[i].x % r == 0 && q[i].y % r == 0 && q[i].z % r == 0) {
			flag = 1;
			cout << q[i].x * 100 + q[i].z % 100 << endl;
		}
	}
	if (!flag || r==0) cout << "No" << endl;
	return 0;
}