답안 #711531

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
711531	2023-03-17T07:52:34 Z	Pety	Calvinball championship (CEOI15_teams)	C++14	20 / 100	1000 ms	696 KB

teams

#include <bits/stdc++.h>
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,abm,avx,mmx,popcnt,tune=native")

using namespace std;

const int mod = 1e9 + 7;

long long n,  dp[2][10002][2], p[10002];

void add (long long &a, long long b) {
  a += b;
  if (a >= mod)
    a-= mod;
}

int main () 
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++)
    cin >> p[i];
  dp[0][0][1] = 1;
  for (int i = 0; i < n; i++) {
    int k = (i & 1);
    for (int j = 0; j <= n; j++)
      dp[k ^ 1][j][0] = dp[k ^ 1][j][1] = 0;
    for (int j = 0; j <= n; j++) {
      ///1 lmao
      if (j > 0)
        add(dp[k ^ 1][j][1], dp[k][j][1] * (p[i + 1] <= j));
      if (j < n)
        add(dp[k ^ 1][j + 1][1], dp[k][j][1] * (j + 1 == p[i + 1]));
      ///0 lmao
      if (j > 0) {
        add(dp[k ^ 1][j][0], 1ll * dp[k][j][1] * min(1ll * j, p[i + 1] - 1) % mod);
        add(dp[k ^ 1][j][0], 1ll * dp[k][j][0] * j % mod);
      }
      if (j < n) {
        add(dp[k ^ 1][j + 1][0], dp[k][j][1] * (j + 1 < p[i + 1]));
        add(dp[k ^ 1][j + 1][0], dp[k][j][0]);
      }
    }
  }
  long long ans = 0;
  for (int i = 1; i <= n; i++) {
    add(ans, dp[n & 1][i][0]);
    add(ans, dp[n & 1][i][1]);
  }
  cout << ans << "\n";
  return 0;
}

Subtask #1
10.0 / 10.0

#	결과	메모리	Grader output
1	Correct	212 KB	Output is correct
2	Correct	212 KB	Output is correct
3	Correct	212 KB	Output is correct
4	Correct	212 KB	Output is correct
5	Correct	212 KB	Output is correct
6	Correct	212 KB	Output is correct

Subtask #2
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 ms	340 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct

Subtask #3
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	1 ms	212 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #4
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	1 ms	340 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #5
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	1 ms	340 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #6
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	3 ms	360 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #7
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	11 ms	372 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #8
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1028 ms	696 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #9
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	253 ms	512 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #10
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1004 ms	692 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

답안 #711531

Compilation message