暴力枚举

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int cnt=0;
    for(int i=0;i<=9;i++){
        for(int j=0;j<=9;j++){
            for(int k=0;k<=9;k++){
                for(int l=0;l<=9;l++){
                    if(i!=j and i!=k and i!=l and j!=k and j!=l and k!=l){
                        cnt++;
                        if(cnt==n+1){
                        	cout<<i<<" "<<j<<" "<<k<<" "<<l;
                    	}
                    }
                    
                }
            }
        }
    }
    return 0;
}