oj.uz

답안 #975497

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
975497 2024-05-05T10:18:23 Z duckindog 캥거루 (CEOI16_kangaroo) C++17
100 / 100
 11 ms 16472 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2'000 + 10,
          M = 1'000'000'007;
int n, st, ed;

struct modint { 
  int value;
  
  modint(int x = 0) : value(x) {}

  modint operator + (const modint& rhs) { return (value + rhs.value) % M; }
  modint operator - (const modint& rhs) { return ((value - rhs.value) % M + M) % M; }
  modint operator * (const modint& rhs) { return 1ll * value * rhs.value % M; }

  modint operator += (const modint& rhs) { value = (value + rhs.value) % M; return *this; }
  modint operator -= (const modint& rhs) { value = ((value - rhs.value) % M + M) % M; return *this; }
  modint operator *= (const modint& rhs) { value = 1ll * value * rhs.value % M; return *this; }

  friend ostream& operator << (ostream& os, const auto& rhs) { return os << rhs.value; }
} f[N][N];

int32_t main() { 
  cin.tie(0)->sync_with_stdio(0);

  cin >> n >> st >> ed;

  f[1][1] = 1;
  for(int i = 2; i <= n; ++i) {
    for(int j = 1; j <= i; ++j) {
      auto& ret = f[i][j];

      if (i == st || i == ed) ret = f[i - 1][j] + f[i - 1][j - 1];
      else ret = f[i - 1][j + 1] * j + f[i - 1][j - 1] * (j - (i > st) - (i > ed));
    }
  }

  cout << f[n][1] << "\n";
}

Compilation message

kangaroo.cpp:22:51: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   22 |   friend ostream& operator << (ostream& os, const auto& rhs) { return os << rhs.value; }
      |                                                   ^~~~

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16472 KB Output is correct
2 Correct 3 ms 16220 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16472 KB Output is correct
2 Correct 3 ms 16220 KB Output is correct
3 Correct 3 ms 16220 KB Output is correct
4 Correct 3 ms 16220 KB Output is correct
5 Correct 3 ms 16220 KB Output is correct
6 Correct 3 ms 16220 KB Output is correct
7 Correct 3 ms 16220 KB Output is correct
8 Correct 3 ms 16216 KB Output is correct
9 Correct 3 ms 16220 KB Output is correct
10 Correct 3 ms 16220 KB Output is correct
11 Correct 3 ms 16216 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16472 KB Output is correct
2 Correct 3 ms 16220 KB Output is correct
3 Correct 3 ms 16220 KB Output is correct
4 Correct 3 ms 16220 KB Output is correct
5 Correct 3 ms 16220 KB Output is correct
6 Correct 3 ms 16220 KB Output is correct
7 Correct 3 ms 16220 KB Output is correct
8 Correct 3 ms 16216 KB Output is correct
9 Correct 3 ms 16220 KB Output is correct
10 Correct 3 ms 16220 KB Output is correct
11 Correct 3 ms 16216 KB Output is correct
12 Correct 3 ms 16220 KB Output is correct
13 Correct 3 ms 16220 KB Output is correct
14 Correct 3 ms 16220 KB Output is correct
15 Correct 3 ms 16220 KB Output is correct
16 Correct 3 ms 16220 KB Output is correct
17 Correct 3 ms 16268 KB Output is correct
18 Correct 3 ms 16220 KB Output is correct
19 Correct 4 ms 16220 KB Output is correct
20 Correct 3 ms 16220 KB Output is correct

Subtask #4
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 16472 KB Output is correct
2 Correct 3 ms 16220 KB Output is correct
3 Correct 3 ms 16220 KB Output is correct
4 Correct 3 ms 16220 KB Output is correct
5 Correct 3 ms 16220 KB Output is correct
6 Correct 3 ms 16220 KB Output is correct
7 Correct 3 ms 16220 KB Output is correct
8 Correct 3 ms 16216 KB Output is correct
9 Correct 3 ms 16220 KB Output is correct
10 Correct 3 ms 16220 KB Output is correct
11 Correct 3 ms 16216 KB Output is correct
12 Correct 3 ms 16220 KB Output is correct
13 Correct 3 ms 16220 KB Output is correct
14 Correct 3 ms 16220 KB Output is correct
15 Correct 3 ms 16220 KB Output is correct
16 Correct 3 ms 16220 KB Output is correct
17 Correct 3 ms 16268 KB Output is correct
18 Correct 3 ms 16220 KB Output is correct
19 Correct 4 ms 16220 KB Output is correct
20 Correct 3 ms 16220 KB Output is correct
21 Correct 4 ms 16216 KB Output is correct
22 Correct 4 ms 16220 KB Output is correct
23 Correct 4 ms 16220 KB Output is correct
24 Correct 11 ms 16216 KB Output is correct
25 Correct 11 ms 16220 KB Output is correct
26 Correct 11 ms 16216 KB Output is correct
27 Correct 11 ms 16220 KB Output is correct
28 Correct 8 ms 16220 KB Output is correct