Submission #281261

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
281261	2020-08-23 04:12:21	AQT	Calvinball championship (CEOI15_teams)	C++14	100 / 100	306 ms	608 KiB

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#include <bits/stdc++.h>
using namespace std;
int N;
int arr[10005];
long long dp[10005];
const int MOD = 1000007;
int main(){
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> N;
  for(int i = 1; i<=N; i++){
    cin >> arr[i];
    dp[i] = 1;
  }
  long long ans = 0;
  for(int i = N; i; i--){
    long long m = *max_element(arr, arr+i);
    ans += min(1LL*arr[i]-1, m) * dp[m];
    for(int j = 1; j<N; j++){
      dp[j] = 1LL * j * dp[j] + dp[j+1];
      dp[j] %= MOD;
    }
    ans %= MOD;
  }
  cout << (ans+1)%MOD;
}
 
 
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• 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