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P1134 [USACO3.2]阶乘问题

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Baoshuo Ren 2021-07-16 22:02:27 +08:00 committed by Baoshuo Ren
parent d89b5a3fc2
commit d481cadb74
Signed by: baoshuo
GPG Key ID: 70F90A673FB1AB68
1 changed files with 20 additions and 0 deletions
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Luogu/problem/P1134/P1134.cpp Normal file
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#include <bits/stdc++.h>
using namespace std;
int n, ans = 1, a[] = {6, 8, 4, 2};
int main() {
cin >> n;
while (n) {
for (int i = 1; i <= n % 10; i++) {
if (i != 5) {
ans = ans * i % 10;
}
}
n = n / 5;
ans = ans * a[n % 4] % 10;
}
cout << ans << endl;
return 0;
}