Submission #1121841

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121841		coolboy19521	Calvinball championship (CEOI15_teams)	C++17	70 / 100	132 ms	65536 KiB

teams

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

const int md = 1000007;
const int mxN = 10004;

int dp[mxN][mxN];
int a[mxN];

main() {
    int N;
    cin >> N;

    for (int i = 1; i <= N; i ++) {
        cin >> a[i];
    }

    for (int i = 1; i <= N + 1; i ++) {
        assert(N + 1 < mxN && i < mxN);
        dp[N + 1][i] = 1;
    }

    for (int i = N; 1 <= i; i --) {
        for (int j = i; 1 <= j; j --) {
            assert(j + 1 < mxN && i + 1 < mxN);
            dp[i][j] = (dp[i][j] + 1ll * dp[i + 1][j] * j % md) % md;
            dp[i][j] = (dp[i][j] + 1ll * dp[i + 1][j + 1]) % md;
        }
    }

    int ans = 0;
    int mx = 0;
    for (int i = 1; i <= N; i ++) {
        mx = max(mx, a[i - 1]);
        for (int j = a[i] - 1; 1 <= j; j --) {
            assert(max(mx, j) < mxN && i + 1 < mxN);
            ans = (0ll + ans + dp[i + 1][max(mx, j)]) % md;
        }
    }

    cout << (ans + 1ll) % md << endl;
}

Compilation message (stderr)

teams.cpp:10:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   10 | main() {
      | ^~~~

• 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