2024 csp-j 小木棍

#include <iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    int x[n+5];
    for(int i = 1;i<=n;i++){
        cin>>x[i];
    }
    for(int i = 1;i<=n;i++){
        if(x[i]==1){
            cout<<-1;
        }else if(x[i]==2){
            cout<<1;
        }else if(x[i]==3){
            cout<<7;
        }else if(x[i]==4){
            cout<<4;
        }else if(x[i]==5){
            cout<<2;
        }else if(x[i]==6){
            cout<<6;
        }else if(x[i]==7){
            cout<<8;
        }else if(x[i]==10){
            cout<<22;
        }else{
            int a = x[i]%7;
            switch(a){
                case 0:{
                    for(int j = 1;j<=x[i]/7;j++){
                        cout<<8;
                    }
                    break;
                }
                case 1:{
                    cout<<10;
                    for(int j = 1;j<=x[i]/7-1;j++){
                        cout<<8;
                    }
                    break;
                }
                case 2:{
                    cout<<18;
                    for(int j = 1;j<=x[i]/7-1;j++){
                        cout<<8;
                    }
                    break;
                }
                case 3:{
                    cout<<200;
                    for(int j = 1;j<=x[i]/7-2;j++){
                        cout<<8;
                    }
                    break;
                }
                case 4:{
                    cout<<20;
                    for(int j = 1;j<=x[i]/7-1;j++){
                        cout<<8;
                    }
                    break;
                }
                case 5:{
                    cout<<28;
                    for(int j = 1;j<=x[i]/7-1;j++){
                        cout<<8;
                    }
                    break;
                }
                case 6:{
                    cout<<68;
                    for(int j = 1;j<=x[i]/7-1;j++){
                        cout<<8;
                    }
                    break;
                }
            }
        }
        cout<<endl;
    }
    return 0;
}