题目链接: 1061 ( Rightmost Digit )

/**
 * hdu1061 Rightmost Digit(快速幂取模)
 *
 */

#include <iostream>
using namespace std;

typedef long long LL;

LL fastPow(LL a, LL b, LL mod = LLONG_MAX)
{
    a %= mod;
    LL t = 1;
    while (b) {
        if (b&1) t = t*a%mod;
        a = a*a%mod;
        b >>= 1;
    }
    return t%mod;
}

int main()
{
    int T;
    cin >> T;
    while (T--) {
        int n;
        cin >> n;
        cout << fastPow(n, n, 10) << endl;
    }
    return 0;
}

hdu1061 Rightmost Digit(快速幂取模)