Submission #44748

#	Time	Username	Problem	Language	Result	Execution time	Memory
44748		RayaBurong25_1	Calvinball championship (CEOI15_teams)	C++17	100 / 100	402 ms	944 KiB

teams

#include <stdio.h>
#define MOD 1000007LL
int n;
int a[10005];
int mx[10005];
long long dp[10005];
long long max(long long a, long long b)
{
    return (a > b)?a:b;
}
int main()
{
    scanf("%d", &n);
    int i, j;
    for (i = 0; i < n; i++)
        scanf("%d", &a[i]);
    long long ans = 1;
    // int mx = 0;
    for (i = 0; i < n; i++)
    {
        if (i == 0)
            mx[i] = a[i];
        else
            mx[i] = max(mx[i - 1], a[i]);
    }
    for (i = 0; i < n - 1; i++)
    {
        for (j = 1; j <= n - i; j++)
        {
            if (i == 0)
                dp[j] = 1LL;
            else
                dp[j] = (1LL*j*dp[j] + dp[j + 1])%MOD;
            // if (j <= 2*n - i)
                // printf("%d ", dp[j]);
        }
        // printf("\n");
        for (j = 1; j < a[n - 1 - i]; j++)
            ans = (ans + dp[max(mx[n - 2 - i], j)])%MOD;
    }
    // for (i = n - 1; i > 0; i--)
    // {
    //     for (j = 1; j < a[i]; j++)
    //         ans = (ans + dp[max(mx[i - 1], j)])%MOD;
    //     // mx = max(mx, a[i]);
    // }
    printf("%lld", ans);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
teams.cpp:16:14: 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: 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