Submission #1081725

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081725		42kangaroo	Calvinball championship (CEOI15_teams)	C++17	20 / 100	268 ms	604 KiB

teams

//
// Created by 42kangaroo on 30/08/2024.
//
#include "bits/stdc++.h"

using namespace std;

using ll = long long;

constexpr ll mod = 1e9 + 7;

signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int n;
	cin >> n;
	vector<int> a(n);
	for (int i = 0; i < n; ++i) {
		cin >> a[i];
	}
	vector<int> nuD(n);
	int act = 1;
	for (int i = 0; i < n; ++i) {
		if (a[i] > act) act++;
		nuD[i] = act;
	}
	vector<ll> dp(n + 1, 1), dpN(n + 1, 0);
	ll res = 1;
	for (int i = n - 1; i >= 0; --i) {
		res += (dp[nuD[i] - 1] * (a[i] - 1))%mod;
		res %= mod;
		for (int j = 0; j < n; ++j) {
			dpN[j] = (dp[j] * j)%mod + dp[j + 1];
			dpN[j] %= mod;
		}
		swap(dp, dpN);
	}
	cout << res;
}

• 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