Submission #527327

#	Time	Username	Problem	Language	Result	Execution time	Memory
527327		squiddy	Calvinball championship (CEOI15_teams)	C++14	100 / 100	194 ms	648 KiB

teams

#include <bits/stdc++.h>

using namespace std;
#define FOR(v, s, e) for (int v = s; v < e; v++)
#define FOR_REV(v, s, e) for (int v = e - 1; v >= s; v--)
#define int long long

#define MOD 1000007
int n, ans;
int val[10005], cmax[10005];
int dp[2][10005];

int32_t main() {
	cin >> n;
	cmax[n - 1] = 1;
	FOR_REV(i, 0, n) {
		cin >> val[i];
		if (i != 0)
			cmax[i - 1] = max(cmax[i], val[i]);
	}
	FOR(i, 0, n) {
		dp[0][i] = 1;
	}
	bool flag = false;
	FOR(i, 0, n) {
		ans = (ans + (val[i] - 1) * dp[flag][cmax[i] - 1]) % MOD;
		FOR(j, 0, n - 1) {
			dp[1 - flag][j] = ((j + 1) * dp[flag][j] + dp[flag][j + 1]) % MOD; 
		}
		flag = 1 - flag;
	}
	cout << (ans + 1) % MOD;
}

• 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