acgo！题解

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    int a=123;
    int a1,a2,a3,a4,c;
    for(int i=1;i<=n;i++){
        a++;
        c=a;
        a1=c%10;
        c/=10;
        a2=c%10;
        c/=10;
        a3=c%10;
        c/=10;
        a4=c%10;
        c/=10;
        if(a1==a2||a1==a3||a1==a4||a2==a3||a2==a4||a3==a4)n++;
    }
    int b[4]{0,0,0,0};
    for(int i=0;i<4;i++){
        b[i]=a%10;
        a/=10;
    }
    for(int i=3;i>=0;i--){
        cout<<b[i]<<' ';
    }
    return 0;
}