Submission #107821

#	Time	Username	Problem	Language	Result	Execution time	Memory
107821		luciocf	Calvinball championship (CEOI15_teams)	C++14	100 / 100	597 ms	576 KiB

teams

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e4+10;
const int mod = 1e6+7;

int a[maxn];

int dp[2][maxn], mx[maxn];

void add(int &a, int b)
{
	a = (a+b)%mod;
}

int main(void)
{
	int n;
	scanf("%d", &n);

	for (int i = 1; i <= n; i++)
	{
		scanf("%d", &a[i]);

		mx[i] = max(mx[i-1], a[i]);
	}

	for (int i = 1; i <= n; i++) dp[0][i] = 1;

	int ans = 1;
	for (int i = n-1; i >= 1; i--)
	{
		int cur = (n-i)%2, prev = (n-i-1)%2;

		for (int j = 1; j <= n; j++)
		{
			dp[cur][j] = 0;

			add(dp[cur][j], (1ll*j*dp[prev][j])%mod);
			add(dp[cur][j], dp[prev][j+1]);
		}


		for (int j = a[i]-1; j >= 1; j--)
			add(ans, dp[cur][max(mx[i-1], j)]);
	}

	add(ans, a[n]-1);

	printf("%d\n", ans);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
teams.cpp:24:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

• 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