답안 #1077639

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1077639	2024-08-27T08:28:30 Z	kchu_z	Tents (JOI18_tents)	C++17	100 / 100	192 ms	67668 KB

tents

#include <bits/stdc++.h>
using namespace std;

long long dp[3001][3001];
bool visited[3001][3001];

long long MOD = 1e9 + 7;

long long f(int n, int m) {
    if (n < 0 || m < 0) return 0;
    if (n == 0 || m == 0) return 1;

    if (visited[n][m]) return dp[n][m];
    visited[n][m] = 1;

    return dp[n][m] = (f(n - 1, m) + 4 * m * f(n - 1, m - 1) + f(n - 1, m - 2) * m * (m - 1) / 2 + f(n - 2, m - 1) * m * (n - 1)) % MOD;
}

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int n, m;
    cin >> n >> m;

    cout << (f(n, m) - 1 + MOD) % MOD << endl;
    return 0;

}

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	2396 KB	Output is correct
2	Correct	0 ms	2396 KB	Output is correct
3	Correct	0 ms	2396 KB	Output is correct
4	Correct	1 ms	7004 KB	Output is correct
5	Correct	0 ms	2652 KB	Output is correct
6	Correct	2 ms	7260 KB	Output is correct
7	Correct	1 ms	4700 KB	Output is correct
8	Correct	1 ms	9308 KB	Output is correct
9	Correct	1 ms	4700 KB	Output is correct
10	Correct	2 ms	9304 KB	Output is correct
11	Correct	0 ms	2396 KB	Output is correct
12	Correct	2 ms	9564 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	2396 KB	Output is correct
2	Correct	0 ms	2396 KB	Output is correct
3	Correct	0 ms	2396 KB	Output is correct
4	Correct	1 ms	7004 KB	Output is correct
5	Correct	0 ms	2652 KB	Output is correct
6	Correct	2 ms	7260 KB	Output is correct
7	Correct	1 ms	4700 KB	Output is correct
8	Correct	1 ms	9308 KB	Output is correct
9	Correct	1 ms	4700 KB	Output is correct
10	Correct	2 ms	9304 KB	Output is correct
11	Correct	0 ms	2396 KB	Output is correct
12	Correct	2 ms	9564 KB	Output is correct
13	Correct	0 ms	2396 KB	Output is correct
14	Correct	8 ms	35420 KB	Output is correct
15	Correct	119 ms	59476 KB	Output is correct
16	Correct	2 ms	7256 KB	Output is correct
17	Correct	11 ms	20824 KB	Output is correct
18	Correct	32 ms	27740 KB	Output is correct
19	Correct	142 ms	63828 KB	Output is correct
20	Correct	108 ms	52564 KB	Output is correct
21	Correct	56 ms	33952 KB	Output is correct
22	Correct	72 ms	43864 KB	Output is correct
23	Correct	47 ms	49236 KB	Output is correct
24	Correct	181 ms	67668 KB	Output is correct
25	Correct	131 ms	57428 KB	Output is correct
26	Correct	169 ms	63352 KB	Output is correct
27	Correct	192 ms	65616 KB	Output is correct