2
3
4
O（logn）的复杂度就是快QAQ
题意 ：求n^n%10 n<1000000000 
#include <iostream>
#include <cstring>
#include <cstdio>
#include <cctype>
#include <cstdlib>
#include <algorithm>
#include <set>
#include <vector>
#include <string>
#include <map>
#include <queue>
using namespace std;
#define LL long long
LL multimod(LL a,LL n,LL m)
{
    LL ans=1,tem=a;
    while(n)
    {
        if(n&1)
            ans=ans*tem%m;
        tem=tem*tem%m;
        n/=2;
    }
    return ans;
}
int main()
{
    LL a,b;int T;
    cin>>T;
    while(T--)
    {
        cin>>a;
        cout<<multimod(a,a,10)<<endl;
    }
    return 0;
}