Submission #9437198


Source Code Expand

// ===================================
//   author: M_sea
//   website: http://m-sea-blog.com/
// ===================================
#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <vector>
#include <cmath>
#define re register
using namespace std;

inline int read() {
    int X=0,w=1; char c=getchar();
    while (c<'0'||c>'9') { if (c=='-') w=-1; c=getchar(); }
    while (c>='0'&&c<='9') X=X*10+c-'0',c=getchar();
    return X*w;
}

const int N=2000+10;
const int mod=924844033;

int n,k;
int a[N<<1],cnt=0;
int fac[N],dp[N<<1][N][2];

int main() {
    n=read(),k=read();
    for (re int i=1;i<=k;++i) {
        for (re int j=i;j<=n;j+=k) a[++cnt]=j==i;
        for (re int j=i;j<=n;j+=k) a[++cnt]=j==i;
    }
    dp[0][0][0]=1;
    for (re int i=0;i<cnt;++i)
        for (re int j=0;j<=n;++j) {
            dp[i+1][j][0]=(dp[i][j][0]+dp[i][j][1])%mod;
            if (!a[i+1]) dp[i+1][j+1][1]=dp[i][j][0];
        }
    fac[0]=1;
    for (re int i=1;i<=n;++i) fac[i]=1ll*fac[i-1]*i%mod;
    int ans=0;
    for (re int i=0;i<=n;++i) {
        int w=1ll*(dp[cnt][i][0]+dp[cnt][i][1])*fac[n-i]%mod;
        if (i&1) ans=(ans-w+mod)%mod;
        else ans=(ans+w)%mod;
    }
    printf("%d\n",ans);
    return 0;
}

Submission Info

Submission Time
Task D - ~K Perm Counting
User M_sea
Language C++14 (GCC 5.4.1)
Score 900
Code Size 1273 Byte
Status AC
Exec Time 32 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 5 ms 13568 KB
handmade0 AC 1 ms 256 KB
handmade1 AC 32 ms 63104 KB
handmade2 AC 31 ms 63104 KB
handmade3 AC 29 ms 59648 KB
handmade4 AC 27 ms 59648 KB
handmade5 AC 32 ms 63104 KB
handmade6 AC 32 ms 63104 KB
maxrand0 AC 29 ms 61696 KB
maxrand1 AC 30 ms 61696 KB
maxrand2 AC 31 ms 62080 KB
maxrand3 AC 30 ms 61696 KB
maxrand4 AC 29 ms 61696 KB
rand0 AC 32 ms 62848 KB
rand1 AC 7 ms 19840 KB
rand2 AC 8 ms 22016 KB
rand3 AC 2 ms 2944 KB
rand4 AC 26 ms 57600 KB
small0 AC 3 ms 9344 KB
small1 AC 2 ms 4992 KB
small2 AC 3 ms 7168 KB
supersmall0 AC 1 ms 256 KB
supersmall1 AC 1 ms 256 KB
supersmall2 AC 1 ms 256 KB