Submission #671001

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
671001	2022-12-11 15:50:33	quocnguyen1012	Calvinball championship (CEOI15_teams)	C++14	0 / 100	265 ms	468 KiB

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#include "bits/stdc++.h"
using namespace std;
const int mod = 1e6 + 7;
const int maxn = 1005;
void add(int &x, int y) {
  x += y;
  if (x >= mod) x -= mod;
  if (x < 0) x += mod;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (auto &i : a) cin >> i;
  vector<int> f(n + 5), g(n + 5);
  f[1] = 1;
  for (int i = 0; i < n; ++i) {
    for (int j = 1; j <= a[i]; ++j) {
      g[j] = (1ll * f[j] * j % mod + 1ll * f[j - 1] * (j - 1) % mod) % mod;
      // cerr << g[j] << " ";
    }
    // cerr << '\n';
    f = g;
 
 
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