Submission #496695

#	Time	Username	Problem	Language	Result	Execution time	Memory
496695		aryan12	Calvinball championship (CEOI15_teams)	C++17	100 / 100	486 ms	656 KiB

teams

#include <bits/stdc++.h>
using namespace std;
#define int long long

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

const int MOD = 1e6 + 7;

void Solve() {
	int n;
	cin >> n;
	int a[n + 1], mx[n + 1];
	mx[0] = 0;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
		mx[i] = max(mx[i - 1], a[i]);
	}
	int dp[2][n + 5];
	for(int i = 0; i <= n + 4; i++) {
		dp[0][i] = 1;
	}
	int ans = 1;
	for(int i = n - 1; i > 0; i--) {
		int cur = (n - i) % 2, prev = 1 - cur;
		for(int j = 1; j <= n; j++) {
			int x = (dp[prev][j] * j) % MOD;
			x += dp[prev][j + 1];
			x %= MOD;
			dp[cur][j] = x;
		}
		for(int j = a[i] - 1; j > 0; j--) {
			int temp = max(mx[i - 1], j);
			ans += dp[cur][temp];
			ans %= MOD;
		}
	}
	cout << (ans + a[n] - 1) % MOD << "\n";
}

int32_t main() {
	auto begin = std::chrono::high_resolution_clock::now();
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	//cin >> t;
	while(t--) {
		Solve();
	}
	auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
	return 0;
}

• 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