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23 lines
577 B
23 lines
577 B
#include <bits/stdc++.h>
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using namespace std;
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typedef long long LL;
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const int MOD = 1000000007;
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const int N = 51; //50只兔子是上限值
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int n; //具体是几只兔子
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int nums[N]; //字牌编号
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int main() {
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LL ans = 1;
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cin >> n;
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for (int i = 1; i <= n; i++)cin >> num[i];
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sort(num + 1, num + 1 + n);//排序,贪心
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for (int i = 1; i <= n; i++) {
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ans *= (num[i] - i + 1);
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ans %= MOD; //边乘边模，使用了同余定理
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}
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//输出结果
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cout << ans << endl;
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return 0;
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} |