51Nod 1004 n^n末尾数字 | 快速幂

#include "bits/stdc++.h"
using namespace std;
#define LL long long
#define INF 0x3f3f3f3f3f
#define PI acos(-1)
#define N 510
#define MOD 10
LL quickPow(LL a,LL b)
{
    LL ans=;
    while(b>){
        if(b&){
            ans=ans*a%MOD;
        }
        b>>=;
        a=a*a%MOD;
    }
    return ans;
}
int main()
{
    int n,k;
    while(~scanf("%d",&n)){
        printf("%lld\n",quickPow(n,n));
    }
    return ;
}