题解 100% AC

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;cin>>n;
    for(int i=1;i<=n;i++){
        if(i%3==0) cout<<i<<"是"<<" "<<3<<" "<<"的倍数"<<endl;
        else cout<<i<<endl;
    }
    return 0;
}