rt，60pts，纯打表（20内）+找规律

#include<bits/stdc++.h>
using namespace std;
int t,n;
int main()
{
	//freopen("sticks.in","r",stdin);
	//freopen("sticks.out","w",stdout);
	cin>>t;
	while(t--)
	{
		cin>>n;
		if(n<2)
		{
			cout<<"-1\n";
			continue;
		}
		if(n==2)
		{
			cout<<"1\n";
			continue;
		}
		if(n==3)
		{
			cout<<"7\n";
			continue;
		}
		if(n==4)
		{
			cout<<"4\n";
			continue;
		}
		if(n==5)
		{
			cout<<"2\n";
			continue;
		}
		if(n==6)
		{
			cout<<"6\n";
			continue;
		}
		if(n==7)
		{
			cout<<"8\n";
			continue;
		}
		if(n==8)
		{
			cout<<"10\n";
			continue;
		}
		if(n==9)
		{
			cout<<"18\n";
			continue;
		}
		if(n==10)
		{
			cout<<"22\n";
			continue;
		}
		if(n==11)
		{
			cout<<"20\n";
			continue;
		}
		if(n==12)
		{
			cout<<"28\n";
			continue;
		}
		if(n==13)
		{
			cout<<"68\n";
			continue;
		}
		if(n==14)
		{
			cout<<"88\n";
			continue;
		}
		if(n==15)
		{
			cout<<"108\n";
			continue;
		}
		if(n==16)
		{
			cout<<"188\n";
			continue;
		}
		if(n==17)
		{
			cout<<"228\n";
			continue;
		}
		if(n==18)
		{
			cout<<"208\n";
			continue;
		}
		if(n==19)
		{
			cout<<"288\n";
			continue;
		}
		if(n==20)
		{
			cout<<"688\n";
			continue;
		}
		if(n%7==0)
		{
			n/=7;
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==1)
		{
			n--;
			n/=7;
			n--;
			cout<<"10";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==2)
		{
			n-=2;
			n/=7;
			cout<<"1";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==3)
		{
			n-=3;
			n/=7;
			cout<<"7";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==4)
		{
			n-=4;
			n/=7;
			cout<<"4";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==5)
		{
			n-=5;
			n/=7;
			cout<<"2";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
		if(n%7==6)
		{
			n-=6;
			n/=7;
			cout<<"6";
			while(n--)cout<<"8";
			cout<<"\n";
			continue;
		}
	}
	fclose(stdin);
	fclose(stdout);
	return 0;
}