oj.uz

답안 #604888

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
604888 2022-07-25T10:37:12 Z Vanilla 캥거루 (CEOI16_kangaroo) C++17
100 / 100
 26 ms 22972 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long int64;
const int maxn = 2e3 + 2;
const int64 mod = 1e9 + 7;
int64 dp[maxn][maxn];

int main() {
    int n,a,b;
    cin >> n >> a >> b;
    dp[0][0] = 1;
    for (int64 i = 1; i <= n; i++){
        for (int64 j = 1; j <= i; j++){
            if (i == a || i == b) {
                dp[i][j] = (dp[i-1][j-1] + dp[i-1][j]) % mod;
            }
            else {
                dp[i][j] = (dp[i-1][j + 1] * j % mod + dp[i-1][j-1] * (j - (i > a) - (i > b)) % mod) % mod;
            }
        }
    }
    cout << dp[n][1];
    return 0;
}

Subtask #1
6.0 / 6.0

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

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 1236 KB Output is correct
13 Correct 2 ms 1108 KB Output is correct
14 Correct 1 ms 1236 KB Output is correct
15 Correct 1 ms 1236 KB Output is correct
16 Correct 1 ms 1236 KB Output is correct
17 Correct 1 ms 1236 KB Output is correct
18 Correct 1 ms 1108 KB Output is correct
19 Correct 1 ms 1236 KB Output is correct
20 Correct 1 ms 1236 KB Output is correct

Subtask #4
49.0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 0 ms 468 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 1236 KB Output is correct
13 Correct 2 ms 1108 KB Output is correct
14 Correct 1 ms 1236 KB Output is correct
15 Correct 1 ms 1236 KB Output is correct
16 Correct 1 ms 1236 KB Output is correct
17 Correct 1 ms 1236 KB Output is correct
18 Correct 1 ms 1108 KB Output is correct
19 Correct 1 ms 1236 KB Output is correct
20 Correct 1 ms 1236 KB Output is correct
21 Correct 3 ms 4564 KB Output is correct
22 Correct 3 ms 4948 KB Output is correct
23 Correct 3 ms 5460 KB Output is correct
24 Correct 26 ms 22860 KB Output is correct
25 Correct 19 ms 22972 KB Output is correct
26 Correct 22 ms 22880 KB Output is correct
27 Correct 24 ms 22704 KB Output is correct
28 Correct 12 ms 15060 KB Output is correct