题目:牛牛最近刚学完指数,他理解了 =4,
=27 ......
但是,他现在想知道:5^n的末三位是多少?
对于100%的数据,0 <= n <= 1e9。
数据组数 t <= 10^6。
思路:刚开始可能考虑过用快速幂,但是发现数据范围后果断先打表找找规律。
#include<bits/stdc++.h>
//#define endl '\n'
#define null NULL
#define ll long long
#define int long long
#define pii pair<int, int>
#define lowbit(x) (x &(-x))
#define ls(x) x<<1
#define rs(x) (x<<1+1)
#define me(ar) memset(ar, 0, sizeof ar)
#define mem(ar,num) memset(ar, num, sizeof ar)
#define rp(i, n) for(int i = 0, i < n; i ++)
#define rep(i, a, n) for(int i = a; i <= n; i ++)
#define pre(i, n, a) for(int i = n; i >= a; i --)
#define IOS ios::sync_with_stdio(0); cin.tie(0);cout.tie(0);
const int way[4][2] = {
{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
using namespace std;
const int inf = 0x3f3f3f3f;
const double PI = acos(-1.0);
const double eps = 1e-6;
const ll mod = 1e9 + 7;
const int N = 2e5 + 5;
inline void read(int &x){
char t=getchar();
while(!isdigit(t)) t=getchar();
for(x=t^48,t=getchar();isdigit(t);t=getchar()) x=x*10+(t^48);
}
signed main()
{
IOS;
int n;
while(cin >> n){
if(n==1) cout << "005" << endl;
else if(n==2) cout << "025" << endl;
else cout << (n%2 ? 125:625) << endl;
}
return 0;
}