제출 #1121731

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1121731		Mamedov	Calvinball championship (CEOI15_teams)	C++17	100 / 100	112 ms	640 KiB

teams

#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>
#define pii pair<int, int>
#define piii pair<pii, int>
#define vi vector<int>
#define vll vector<ll>
#define vvi vector<vi>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define f first
#define s second
#define oo 1000000001
#define eb emplace_back
#define pb push_back
#define mpr make_pair
#define size(v) (int)v.size()
#define ln '\n'
#define ull unsigned long long
#define ll long long
#define all(v) v.begin(), v.end()
#define iospeed ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
//#define pbase 361549
//#define imod 1073737591
//#define uimod 2147479307u
//#define llmod 292187309552789533ll


using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

//using namespace __gnu_pbds;
//template <typename T>
//using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

template <typename T>
void show(vector<T> &v) {
  for (T i : v) {
    cout << i << ' ';
  }
  cout << ln;
}

void solve() {
  int n;
  cin >> n;
  vi a(n + 1);
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
  }
  vvi dp(2, vi(n + 1));
  for (int i = 1; i <= n; ++i) {
    dp[n & 1][i] = 1;
  }
  const int mod = 1e6 + 7;

  int res = 1;
  vi pmax(n + 1);
  pmax[1] = a[1];
  for (int i = 2; i <= n; ++i) {
    pmax[i] = max(pmax[i - 1], a[i]);
  }

  for (int i = n - 1; i >= 1; --i) {
    for (int m = 1; m <= i; ++m) {
      dp[i & 1][m] = (1ll * m * dp[(i + 1) & 1][m] + dp[(i + 1) & 1][m + 1]) % mod;
    }
    res = (1ll * (a[i + 1] - 1) * dp[(i + 1) & 1][pmax[i]] + res) % mod;
  }
  cout << res << ln;
}
int main() {
  iospeed;
  solve();
  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