Submission #2124556


Source Code Expand

#include <iostream>
#include <cstdio>

using namespace std;

const int P=1000000007;
const int N=2005;

int f[N][N][2];
int n,K,ans;

inline void update(int &x,int y){(x+=y)%=P;}

int main()
{
	//freopen("solitaire.in","r",stdin),freopen("solitaire.out","w",stdout);
	scanf("%d%d",&n,&K);
	f[n+1][0][0]=1;
	for (int i=n+1;i>=2;--i)
	{
		for (int j=n-1;j>=0;--j) update(f[i][j][0],f[i][j+1][0]);
		for (int j=0;j<=n;++j)
			for (int k=0;k<2;++k)
				if (f[i][j][k])
				{
					update(f[i-1][j+1][1],f[i][j][k]);
					update(f[i-1][j][0],f[i][j][k]);
				}
	}
	ans=f[1][n-K][0];
	for (int i=1;i<=n-K-1;++i) (ans<<=1)%=P;
	printf("%d\n",ans);
	//fclose(stdin),fclose(stdout);
	return 0;
}

Submission Info

Submission Time
Task F - Solitaire
User crazy_cloud
Language C++14 (GCC 5.4.1)
Score 1200
Code Size 719 Byte
Status AC
Exec Time 51 ms
Memory 31616 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:17:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&K);
                     ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 1200 / 1200
Status
AC × 3
AC × 26
Set Name Test Cases
Sample 00_example_01.txt, 00_example_02.txt, 00_example_03.txt
All 00_example_01.txt, 00_example_02.txt, 00_example_03.txt, 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt
Case Name Status Exec Time Memory
00_example_01.txt AC 1 ms 256 KB
00_example_02.txt AC 1 ms 256 KB
00_example_03.txt AC 51 ms 31616 KB
01.txt AC 1 ms 256 KB
02.txt AC 17 ms 18176 KB
03.txt AC 1 ms 384 KB
04.txt AC 2 ms 2944 KB
05.txt AC 1 ms 256 KB
06.txt AC 1 ms 256 KB
07.txt AC 1 ms 384 KB
08.txt AC 1 ms 384 KB
09.txt AC 46 ms 30976 KB
10.txt AC 1 ms 256 KB
11.txt AC 1 ms 256 KB
12.txt AC 45 ms 30976 KB
13.txt AC 2 ms 2944 KB
14.txt AC 50 ms 31360 KB
15.txt AC 6 ms 9472 KB
16.txt AC 51 ms 31616 KB
17.txt AC 50 ms 31616 KB
18.txt AC 51 ms 31616 KB
19.txt AC 51 ms 31616 KB
20.txt AC 51 ms 31616 KB
21.txt AC 1 ms 256 KB
22.txt AC 51 ms 31616 KB
23.txt AC 51 ms 31616 KB