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OI-codes/Luogu/P1866/P1866.cpp

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2021-07-01 00:03:18 +00:00
#include <bits/stdc++.h>
using namespace std;
int n, a[55];
long long ans = 1;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
sort(a + 1, a + n + 1);
for (int i = 1; i <= n; i++) {
ans *= a[i] - i + 1;
ans %= 1000000007;
}
cout << ans << endl;
return 0;
}