Submission #211640

#	Time	Username	Problem	Language	Result	Execution time	Memory
211640		MetB	Calvinball championship (CEOI15_teams)	C++14	100 / 100	225 ms	736 KiB

teams

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
 
using namespace __gnu_pbds;
 
#define N 2000001
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
 
const ll INF = 1e18, MOD = 1e6 + 7, MOD2 = 1e6 + 3;

ll ans = 1, d[10001][2], a[N], n, mx[N];

int main () {
	cin >> n;

	for (int i = 0; i < n; i++) {
		cin >> a[i];
		mx[i] = a[i];
		if (i) mx[i] = max (mx[i], mx[i-1]);
	}

	for (int i = 0; i < n; i++) {
		d[i][0] = 1;
	}

	for (int i = n - 1; i >= 0; i--) {
		int k = ((n - i) & 1);
		
		for (int j = 0; j <= n; j++) {
			d[j][k] = (j * d[j][!k] + d[j+1][!k]) % MOD;
		}
		
		ans = (ans + (a[i] - 1) * d[i ? mx[i-1] : 0LL][!k]) % MOD;
	}

	cout << ans;
}

• 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