Submission #251130

#	Time	Username	Problem	Language	Result	Execution time	Memory
251130		Sorting	Calvinball championship (CEOI15_teams)	C++17	20 / 100	130 ms	65540 KiB

teams

#include <bits/stdc++.h>

using namespace std;

const int k_N = 1e4 + 3;
const long long k_Mod = 1e9 + 7;

int n, a[k_N];
pair<int, bool> dp[k_N][k_N][2];

int solve(int pos, int cnt, bool equal){
    if(pos == n) return 1;

    auto &[ans, solved] = dp[pos][cnt][equal];
    if(solved) return ans;

    solved = true;
    ans = 0;

    if(!equal){ 
        ans = (((long long)solve(pos + 1, cnt, false)) * (long long)cnt + (long long)solve(pos + 1, cnt + 1, false)) % k_Mod;
        return ans;
    }

    ans = (((long long)solve(pos + 1, cnt, false)) * (long long)min(cnt, a[pos] - 1)) % k_Mod;
    if(a[pos] <= cnt)
        ans += solve(pos + 1, cnt, true);
    else if(a[pos] == cnt + 1)
        ans += solve(pos + 1, cnt + 1, true);
    else if(a[pos] > cnt + 1)
        ans += solve(pos + 1, cnt + 1, false);

    ans %= k_Mod;
    return ans;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n;
    for(int i = 0; i < n; ++i)
        cin >> a[i];

    cout << solve(0, 0, true) << "\n";
}

• 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