HDU1061 - Rightmost Digit

Given a positive integer N, you should output the most right digit of N^N. 

Input

The input contains several test cases. The first line of the input is a single integer T which is the number of test cases. T test cases follow. 
Each test case contains a single positive integer N(1<=N<=1,000,000,000). 

Output

For each test case, you should output the rightmost digit of N^N. 

Sample Input

2
3
4

Sample Output

7
6

思路：这题是真正的水题，直接套用模板QAQ

#include<bits/stdc++.h>
using namespace std;
long long PowerMod(long long a, long long b, long long c)
{
    long long ans = 1;
    a = a % c; //对刚进来的a进行取模运算，避免后面第一次求平方运算溢出
    while(b)
    {
        if(b&1) //相当于b % 2 = = 1对二进制下的 b 进行按位与1运算，求二进制下 b 的最低位是否为1
            ans = ans * a % c; //对结果进行保存
        b>>=1; //相当于b = b/2;二进制下的 b 右移一位，相当于十进制下的 b 除以2
        a = a * a % c;
    }
    return ans;
}

int main()
{
    long long t,n,m;
    cin>>t;
    while(t--)
    {
        cin>>n;
        m=PowerMod(n,n,10);
        cout<<m<<endl;
    }
    return 0;
}