Submission #476127

#	Time	Username	Problem	Language	Result	Execution time	Memory
476127		elgamalsalman	Calvinball championship (CEOI15_teams)	C++14	100 / 100	724 ms	660 KiB

teams

#include <bits/stdc++.h>

using namespace std;

#define MODVAL 1000007

typedef long long ll;
typedef vector<int> vi;

int n, m[10010];
ll dp[200020];
vi a;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  cin >> n;
  a = {1};
  for (int i = 0; i < n; i++) {
    int tmp;
    cin >> tmp;
    a.push_back(tmp);
  }
  n++;
  reverse(a.begin(), a.end());

  int mx = 1;
  for (int i = n - 1; i >= 0; i--) {
    if (a[i] > mx) mx = a[i];
    m[i] = mx;
  }

  fill(dp, dp + 2 * n + 10, 1);
  ll ans = 1;
  for (int i = 0; i < n - 1; i++) {
    if (i) for (int j = 0; j < 2 * n + 5; j++) {
      dp[j] *= j;
      dp[j] %= MODVAL;
      dp[j] += dp[j + 1];
      dp[j] %= MODVAL;
    }
    ans += ((a[i] - 1) * dp[m[i + 1]]) % MODVAL;
    ans %= MODVAL;
  }
  cout << ans << '\n';
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10