Submission #503351

#	Time	Username	Problem	Language	Result	Execution time	Memory
503351		CraniXort	Calvinball championship (CEOI15_teams)	C++17	100 / 100	111 ms	588 KiB

teams

#include <bits/stdc++.h>

#define fin std::cin
#define fout std::cout

// std::ifstream fin("calvinball.in");
// std::ofstream fout("calvinball.out");


const long long mod = 1000007;


int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    std::cout.tie(NULL);

    int n;
    fin >> n;
    std::vector <int> v(n), max(n);

    for(int i = 0; i < n; i ++)
        fin >> v[i];

    max[0] = 0;
    for(int i = 1; i < n; i ++)
        max[i] = std::max(max[i-1], v[i-1]);

    long long dp[2][n+1], current = 0, next = 1;
    for(int i = 0; i < n; i ++)
        dp[current][i] = 1;

    long long ans = 0;

    for(int i = n-1; i >= 0; i--, current ^= 1, next ^= 1) {
        ans = ans + (v[i] - 1) * dp[current][max[i]];
        ans %= mod;

        for(int j = 0; j < i; j ++)
            dp[next][j] = (j * dp[current][j] + dp[current][j+1]) % mod;
        
    }

    fout << (1 + ans) % mod << '\n';



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