제출 #569950

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
569950		600Mihnea	Calvinball championship (CEOI15_teams)	C++17	100 / 100	815 ms	424 KiB

teams

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int M =  1000007;

int add(int a, int b) {
  a += b;
  if (a >= M) return a - M;
  if (a < 0) return a + M;
  return a;
}

int mul(int a, int b) {
  return a * (ll) b % M;
}

void addup(int &a, int b) {
  a = add(a, b);
}

void mulup(int &a, int b) {
  a = mul(a, b);
}

const int N = 10000 + 7;
int n, a[N], mx[N], ways[N];

signed main() {
  ios::sync_with_stdio(0); cin.tie(0);


  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    mx[i] = max(mx[i - 1], a[i]);
    ways[i] = 1;
  }

  int sol = 1;
  for (int i = n; i >= 1; i--) {
    addup(sol, mul(a[i] - 1, ways[mx[i - 1]]));
    for (int j = 1; j <= n; j++) {
      ways[j] = add(mul(j, ways[j]), ways[j + 1]);
    }
  }
  cout << sol << "\n";
}

• 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