Submission #527222

#	Time	Username	Problem	Language	Result	Execution time	Memory
527222		joelau	Calvinball championship (CEOI15_teams)	C++14	70 / 100	44 ms	65540 KiB

teams

#include <bits/stdc++.h>
using namespace std;

long long N, A[10005], p = 1000007;
vector<long long> dp[10005];

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> N;
    for (long long i = 1; i <= N; ++i) cin >> A[i];
    for (long long i = 1; i <= N+1; ++i) dp[i].assign(i+1,1);
    for (long long i = N; i > 0; --i) for (long long j = 1; j <= i; ++j) dp[i][j] = (dp[i+1][j] * j + dp[i+1][j+1]) % p;
    long long ans = 1, most = 0;
    for (long long i = 1; i <= N; ++i) {
        ans = (ans + dp[i+1][most] * min(most,A[i]-1)) % p;
        for (long long j = most+1; j < A[i]; ++j) ans = (ans + dp[i+1][j]) % p;
        most = max(most,A[i]);
    }
    cout << ans;

    return 0;
}

• 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: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10