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Submission #786378

# Submission time Handle Problem Language Result Execution time Memory
786378 2023-07-18T07:16:38 Z 박영우(#10030) NoM (RMI21_nom) C++17
9 / 100
 4 ms 1492 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
#define MAX 2020
#define MAXS 22
#define INF 1000000000000000001
#define bb ' '
#define ln '\n'
#define Ln '\n'
#define MOD 1000000007
ll fact[MAX * 2];
int A[MAX];
ll dp[MAX][MAX * 2];
ll C[MAX * 2][MAX * 2];
void add(ll& a, ll b) { a = (a + b) % MOD; }
ll mpow(ll x, ll y = MOD - 2) {
	if (!y) return 1;
	ll res = mpow(x, y >> 1);
	res *= res;
	res %= MOD;
	if (y & 1) res = (res * x) % MOD;
	return res;
}
ll P(ll n, ll r) {
	return (C[n][r] * fact[r]) % MOD;
}
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int N, M;
	cin >> N >> M;
	int i, j, k;
	C[0][0] = 1;
	for (i = 1; i <= N * 2; i++) {
		C[i][0] = C[i][i] = 1;
		for (j = 1; j < i; j++) C[i][j] = (C[i - 1][j] + C[i - 1][j - 1]) % MOD;
	}
	for (i = 1; i <= N * 2; i++) A[i % M]++;
	fact[0] = 1;
	for (i = 1; i <= N * 2; i++) fact[i] = (fact[i - 1] * i) % MOD;
	dp[0][A[0]] = 1;
	int sum = A[0];
	for (i = 1; i < M; i++, sum += A[i]) for (j = 0; j <= sum; j++) for (k = 0; k <= min(j, A[i]); k++) add(dp[i][j + A[i] - k * 2], dp[i - 1][j] * ((P(A[i], k) * C[j][k]) % MOD));
	ll ans = (dp[M - 1][0] * fact[N]) % MOD;
	ans *= mpow(2, N);
	ans %= MOD;
	cout << ans;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 2 ms 1492 KB Output is correct
12 Correct 1 ms 1128 KB Output is correct
13 Correct 1 ms 852 KB Output is correct
14 Incorrect 0 ms 980 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 2 ms 1492 KB Output is correct
12 Correct 1 ms 1128 KB Output is correct
13 Correct 1 ms 852 KB Output is correct
14 Incorrect 0 ms 980 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 2 ms 1492 KB Output is correct
12 Correct 1 ms 1128 KB Output is correct
13 Correct 1 ms 852 KB Output is correct
14 Incorrect 0 ms 980 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #5
0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 2 ms 1492 KB Output is correct
12 Correct 1 ms 1128 KB Output is correct
13 Correct 1 ms 852 KB Output is correct
14 Incorrect 0 ms 980 KB Output isn't correct
15 Halted 0 ms 0 KB -