oj.uz

답안 #961268

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
961268 2024-04-11T19:13:07 Z n3rm1n Tents (JOI18_tents) C++17
100 / 100
 307 ms 71032 KB 
#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const int MAXN = 3e3 + 10;
void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int n, m;
long long dp[MAXN][MAXN];
long long mod = 1e9 + 7;
void solve()
{
    cin >> n >> m;
    for (int i = 0; i <= n; ++ i)
        dp[i][0] = 1;
    for (int j = 0; j <= m; ++ j)
        dp[0][j] = 1;
    for (long long i = 1; i <= n; ++ i)
    {
        for (long long j = 1; j <= m; ++ j)
        {
            /// 0.
            dp[i][j] = dp[i-1][j];
            /// 1. x .... x
            if(j >= 2)
            {
                dp[i][j] += (dp[i-1][j-2] * ((j * (j - 1) / 2) % mod)) % mod;
                dp[i][j] %= mod;
            }
            /// 2. x
            ///    .
            ///    .
            ///    x
            if(i >= 2)
            {
                dp[i][j] += dp[i-2][j-1] * (i-1) * j;
                dp[i][j] %= mod;
            }
            /// 3. x
            dp[i][j] += (dp[i-1][j-1] * j * 4) % mod;
            dp[i][j] %= mod;
        }
    }
    long long ans = (dp[n][m] + mod - 1) % mod;
    cout << ans << endl;
}
int main()
{
    speed();
    solve();
    return 0;
}

Subtask #1
48.0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 3 ms 6492 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct
6 Correct 3 ms 6620 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 3 ms 8540 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 5 ms 8536 KB Output is correct

Subtask #2
52.0 / 52.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 3 ms 6492 KB Output is correct
5 Correct 1 ms 2648 KB Output is correct
6 Correct 3 ms 6620 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 2 ms 6492 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 3 ms 8540 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 5 ms 8536 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 18 ms 55892 KB Output is correct
15 Correct 197 ms 66268 KB Output is correct
16 Correct 13 ms 6748 KB Output is correct
17 Correct 42 ms 17004 KB Output is correct
18 Correct 54 ms 29280 KB Output is correct
19 Correct 227 ms 70384 KB Output is correct
20 Correct 178 ms 59996 KB Output is correct
21 Correct 117 ms 39516 KB Output is correct
22 Correct 116 ms 51876 KB Output is correct
23 Correct 70 ms 70408 KB Output is correct
24 Correct 307 ms 71032 KB Output is correct
25 Correct 226 ms 62044 KB Output is correct
26 Correct 262 ms 68336 KB Output is correct
27 Correct 299 ms 70396 KB Output is correct