Submission #95860

#	Time	Username	Problem	Language	Result	Execution time	Memory
95860		Kastanda	Calvinball championship (CEOI15_teams)	C++11	100 / 100	237 ms	568 KiB

teams

#include<bits/stdc++.h>
using namespace std;
const int N = 10004, Mod = 1000007;
int n, Mx, tot, A[N], C[N], dp[2][N];
int main()
{
    scanf("%d", &n);
    for (int i = 1; i <= n; i++)
        scanf("%d", &A[i]), C[A[i]] ++, Mx = max(Mx, A[i]);
    tot = 1;
    for (int i = 0; i < N; i++)
        dp[0][i] = 1;
    for (int i = 1; i <= n; i++)
    {
        int w = i & 1;
        for (int j = 0; j < N; j++)
            dp[w][j] = (dp[!w][j + 1] + 1LL * dp[!w][j] * j) % Mod;
        C[A[n - i + 1]] --;
        if (!C[A[n - i + 1]])
            Mx --;
        for (int j = 1; j < A[n - i + 1]; j++)
        {
            tot = (tot + dp[!w][Mx]);
            if (tot >= Mod)
                tot -= Mod;
        }
    }
    return !printf("%d\n", tot);
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
teams.cpp:9:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]), C[A[i]] ++, Mx = max(Mx, A[i]);
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
teams.cpp:17:37: warning: iteration 10003 invokes undefined behavior [-Waggressive-loop-optimizations]
             dp[w][j] = (dp[!w][j + 1] + 1LL * dp[!w][j] * j) % Mod;
                         ~~~~~~~~~~~~^
teams.cpp:16:27: note: within this loop
         for (int j = 0; j < N; j++)
                         ~~^~~

• 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