Submission #1695211


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define M 2010
#define MOD 924844033
#define rep(i, x, y) for(int i = (x); i <= (y); i ++)
inline int read() {
	char ch = getchar(); int x = 0, f = 1;
	while(ch < '0' || ch > '9') {
		if(ch == '-') f = -1;
		ch = getchar();
	} while('0' <= ch && ch <= '9') {
		x = x * 10 + ch - '0';
		ch = getchar();
	} return x * f;
}
bool vis[2010][2];
int f[4010][2010][2];
bool a[4010];
int fac[4010];
int sum;
int main() {
	int n = read(), k = read();
	fac[0] = 1; rep(i, 1, n) fac[i] = 1ll * i * fac[i - 1] % MOD;
	rep(i, 1, n) rep(j, 0, 1) if(!vis[i][j]) {
		int u = i, v = j;
		int now = 0;
		while(u <= n) {
			vis[u][v] = 1;
			u += k; v ^= 1;
			now ++;
		} a[sum += now] = 1;
	} f[1][0][0] = 1;
	rep(i, 2, sum) rep(j, 0, n) {
		(f[i][j][0] += f[i - 1][j][0]) %= MOD;
		(f[i][j][0] += f[i - 1][j][1]) %= MOD;
		if(!a[i - 1]) {
			(f[i][j][1] += f[i - 1][j - 1][0]) %= MOD;
		}
	} int ans = 0;
	rep(i, 0, n) {
		ans = (ans + 1ll * (i & 1 ? -1 : 1) * fac[n - i] * (f[sum][i][0] + f[sum][i][1]) % MOD + MOD) % MOD;
	} cout << ans;
	return 0;
}

Submission Info

Submission Time
Task D - ~K Perm Counting
User iamqzh
Language C++14 (GCC 5.4.1)
Score 900
Code Size 1125 Byte
Status AC
Exec Time 60 ms
Memory 63104 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 900 / 900
Status
AC × 5
AC × 28
Set Name Test Cases
Sample example0, example1, example2, example3, example4
All example0, example1, example2, example3, example4, handmade0, handmade1, handmade2, handmade3, handmade4, handmade5, handmade6, maxrand0, maxrand1, maxrand2, maxrand3, maxrand4, rand0, rand1, rand2, rand3, rand4, small0, small1, small2, supersmall0, supersmall1, supersmall2
Case Name Status Exec Time Memory
example0 AC 1 ms 256 KB
example1 AC 1 ms 256 KB
example2 AC 1 ms 256 KB
example3 AC 1 ms 256 KB
example4 AC 6 ms 13440 KB
handmade0 AC 1 ms 256 KB
handmade1 AC 58 ms 63104 KB
handmade2 AC 47 ms 63104 KB
handmade3 AC 52 ms 59648 KB
handmade4 AC 41 ms 59648 KB
handmade5 AC 58 ms 63104 KB
handmade6 AC 60 ms 63104 KB
maxrand0 AC 45 ms 61696 KB
maxrand1 AC 49 ms 61696 KB
maxrand2 AC 51 ms 61952 KB
maxrand3 AC 53 ms 61696 KB
maxrand4 AC 43 ms 61696 KB
rand0 AC 55 ms 62848 KB
rand1 AC 9 ms 19840 KB
rand2 AC 10 ms 21888 KB
rand3 AC 2 ms 2944 KB
rand4 AC 41 ms 57600 KB
small0 AC 4 ms 9216 KB
small1 AC 3 ms 4992 KB
small2 AC 4 ms 7168 KB
supersmall0 AC 1 ms 256 KB
supersmall1 AC 1 ms 256 KB
supersmall2 AC 1 ms 256 KB