제출 #856610

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
856610		NeroZein	Calvinball championship (CEOI15_teams)	C++17	100 / 100	77 ms	856 KiB

teams

#include "bits/stdc++.h"
using namespace std;
 
const int md = 1000007;
 
int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  vector<int> a(n);
  vector<int> till(n); 
  for (int i = 0; i < n; ++i) {
    cin >> a[i]; 
  }
  for (int i = 1; i < n; ++i) {
    till[i] = max(till[i - 1], a[i - 1]); 
  }
  vector<long long> dp(n + 1), pd(n + 1); 
  for (int i = 1; i <= n; ++i) {
    pd[i] = 1; 
  }
  long long ans = 1; 
  for (int i = n - 1; i >= 0; --i) {
    ans += pd[till[i]] * (a[i] - 1); 
    ans %= md; 
    for (int j = 1; j < i; ++j) {
      dp[j] = pd[j] * j + pd[j + 1];
      dp[j] %= md; 
    }
    swap(dp, pd); 
  }
  cout << ans << '\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