Submission #166536

#	Time	Username	Problem	Language	Result	Execution time	Memory
166536		luciocf	Calvinball championship (CEOI15_teams)	C++14	20 / 100	153 ms	65540 KiB

teams

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e4+10;
const int mod = 1e9+7;

int n;
int a[maxn];

int dp[maxn][maxn];
int pref[maxn][maxn];

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

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

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

    for (int i = 2; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            dp[i][j] = (1ll*j*dp[i-1][j])%mod;
            dp[i][j] = (dp[i][j] + dp[i-1][j+1])%mod;
        }
    }

    int ans = 0, mx = 0;

    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j < a[i]; j++)
            ans = (ans + dp[n-i+1][max(mx, j)])%mod;

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

    printf("%d\n", ans+1);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
teams.cpp:19:14: 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: 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