Submission #1121873

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121873		HasanV11010238	Calvinball championship (CEOI15_teams)	C++17	10 / 100	59 ms	65536 KiB

teams

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long long
#define mod 1000007
int main(){
    int n;
    cin>>n;
    vector<ll> v(n + 1, 0);
    for (int i = 1; i <= n; i++){
        cin>>v[i];
    }
    vector<vector<ll>> dp(n + 1, vector<ll>(n + 1, 0)), prdp(n + 1, vector<ll>(n + 1, 0));
    dp[0][0] = 1;
    for (int i = 0; i <= n; i++){
        ll su = 0;
        if (i != 0)
        for (int j = 1; j <= n; j++){
            dp[i][j] += dp[i - 1][j - 1];
            dp[i][j] += dp[i - 1][j] * j;
            dp[i][j] %= mod;
        }
        if (i == 0) prdp[i][0] = 1;
        for (int j = 1; j <= n; j++){
            prdp[i][j] += prdp[i][j - 1] + dp[i][j];
            prdp[i][j] %= mod;
        }
    }
    ll ans = 0, la = 0;
    for (int i = 1; i <= n; i++){
        if (i == n){
            ans += v[i] - 1;
            ans %= mod;
            break;
        }
        ll su = v[i] - 1;
        for (int j = i + 1; j <= n + 1; j++){
            ans += su * prdp[n - j + 1][n - la];
            ans %= mod;
            su *= la;
            su %= mod;
        }
        ans %= mod;
        la = max(v[i], la);
    }
    cout<<(ans + 1) % mod;
}

Compilation message (stderr)

teams.cpp: In function 'int main()':
teams.cpp:16:12: warning: unused variable 'su' [-Wunused-variable]
   16 |         ll su = 0;
      |            ^~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 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