51nod 1004 n^n的末位数字（快速幂）

51nod 1004 n^n的末位数字

末尾，快速幂mod10即可。

#include <iostream>#include <cstdio>#include <cstring>#include <cmath>#include <algorithm>#include <queue>#include <map>using namespace std;#define LL long long#define INF 0x3f3f3f3f#define PI acos(-1.0)#define E 2.71828#define MOD 1000000007#define N 1010LL quick_mi(LL x,LL n){    LL ans = 1;    while(n)    {        if(n&1) ans = (ans*x)%10;        x = (x*x)%10;        n >>= 1;    }    return ans;}int main(){    LL n;    scanf("%lld",&n);    LL ans =quick_mi(n,n);    printf("%lld\n",ans);    return 0;}