$1.$

#include<bits/stdc++.h>
#define r(a) scanf("%d",&a)
#define f(i,l,r) for(int i=l;i<=r;i++)
using namespace std;
int n;
int main(){
	r(n);
	bool FUCK=0;
	f(i,1,2){
		f(j,0,9){
			f(k,0,9){
				f(l,0,9){
					f(p,0,9){
						int sum=i*100+j*10+k;
						int sum2=j*100+k*10+l;
						int sum3=k*100+l*10+p;
						if(sum%n==0&&sum2%n==0&&sum3%n==0){
							printf("%d\n",i*10000+j*1000+k*100+l*10+p);FUCK=1;
						}
					}
				}
			}
		}
	}
	if(300%n==0) printf("30000\n"),FUCK=1;
	if(!FUCK) printf("No");
	return 0;
}//无敌暴力

$2.$

#include<bits/stdc++.h>
using namespace std;
int k;
signed main(){
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin>>k;
	bool flag=0;
	for(int i=10000;i<=30000;i++){
		int sub1=i/100,sub2=i/10%1000,sub3=i%1000;
		if(sub1%k==0&&sub2%k==0&&sub3%k==0){
			cout<<i<<'\n';
			flag=1;
		}
	}
	if(!flag){
		cout<<"No";
	}
	return 0;
}//更好写

#include<bits/stdc++.h> using namespace std; int k,sub1,sub2,sub3; int main(){ cin>>k; int sum=0; for(int i=10000;i<=30000;i++){ sub1=i/100; sub2=i/10%1000; sub3=i%1000; if(sub1%k0&&sub2%k0&&sub3%k0){ cout<<i; sum++; cout<<endl; } } if(sum0) cout<<"No"; return 0; }