Submission #109283

#	Time	Username	Problem	Language	Result	Execution time	Memory
109283		dupreez	Calvinball championship (CEOI15_teams)	C++14	20 / 100	98 ms	63620 KiB

teams

#include <iostream>
#include <algorithm>
#include <cstring>
#include <sstream>
#include <map>
#include <queue>
#include <vector>
#include <deque>
#include <climits>
#define scanf scanf_s
#define mk make_pair
#define pb push_back
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> pos;
const ll MOD = 1000000007, N = 2010.;

ll n, a[N], ans = 0,dp[N][N],dp2[N][N];

ll cal(ll lgt, ll knd) {
	return dp[lgt][knd] + dp2[lgt][knd + 1];
}

int main() {
	for (int i = 1; i < N; i++) { dp[1][i] = i; dp2[1][i] = 1; dp[0][i] = 1; }
	for (int i = 2; i < N; i++) {
		for (int j = 1; j < N - 1; j++) {
			ll v1 = (dp[i - 1][j] * j) % MOD, v2 = (dp2[i - 1][j + 1] * j) % MOD;
			dp[i][j] = (v1 + v2) % MOD;
			dp2[i][j] = (dp[i - 1][j] + dp2[i - 1][j + 1]) % MOD;
		}
	}
	cin >> n;
	for (int i = 1; i <= n; i++)cin >> a[i];
	ll knd = 0;
	for (int i = 1; i <= n; i++) {
		ll v1 = (a[i] - 1) * cal(n - i, knd);
		v1 %= MOD;
		ans = (ans + v1) % MOD;
		knd = max(knd, a[i]);
	}
	ans = (ans + 1) % MOD;
	cout << ans << endl;
	return 0;
}

• 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