Submission #1081785

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081785		Elias	Calvinball championship (CEOI15_teams)	C++17	20 / 100	30 ms	65536 KiB

teams

#include <bits/stdc++.h>

using namespace std;

#define int long long

int mod = 1e9 + 7;

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

	int n;
	cin >> n;

	vector<int> a(n);

	for (int &x : a)
		cin >> x;

	vector<int> pref = a;

	for (int i = 1; i < n; i++)
	{
		pref[i] = max(pref[i - 1], pref[i]);
	}

	vector<vector<int>> dp(n + 1, vector<int>(n + 1, 1));

	int count = 1;

	for (int i = n - 1; i >= 1; i--)
	{
		for (int max_here = 1; max_here <= i; max_here++)
		{
			dp[i][max_here] = ((dp[i + 1][max_here] * max_here) % mod + dp[i + 1][max_here + 1]) % mod;
		}
		count += ((dp[i + 1][pref[i - 1]]) * (a[i] - 1)) % mod;
		count %= mod;
	}

	cout << count;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10