Submission #720490

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
720490	2023-04-08 11:05:04	mariowong	Calvinball championship (CEOI15_teams)	C++14	100 / 100	186 ms	884 KiB

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#include <bits/stdc++.h>
const long long xmod=1000007;
using namespace std;
long long dp[10005][5],a[10005],mx[10005];
int main(){
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  long long ans=1;
  for (int i=1;i<=n;i++) cin >> a[i];
  for (int i=1;i<=n;i++) mx[i]=max(mx[i-1],a[i]);
  for (int i=1;i<=n+1;i++) dp[i][(n+1)%2]=1;
  for (int i=n;i>=1;i--){
    ans+=(dp[mx[i-1]][(i+1)%2]*(a[i]-1))%xmod; ans%=xmod;
    for (long long j=1;j<i;j++){
      dp[j][i%2]=dp[j+1][(i+1)%2];
      dp[j][i%2]+=(j*(dp[j][(i+1)%2]))%xmod;
      dp[j][i%2]%=xmod;
    }
  }
  cout << ans << "\n";
  return 0;
}
 
 
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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