Submission #1839675

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Source Code Expand

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<ctime>
#include<utility>
#include<cmath>
#include<functional>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
void sort(int &a,int &b)
{
	if(a>b)
		swap(a,b);
}
void open(const char *s)
{
#ifndef ONLINE_JUDGE
	char str[100];
	sprintf(str,"%s.in",s);
	freopen(str,"r",stdin);
	sprintf(str,"%s.out",s);
	freopen(str,"w",stdout);
#endif
}
int rd()
{
	int s=0,c;
	while((c=getchar())<'0'||c>'9');
	do
	{
		s=s*10+c-'0';
	}
	while((c=getchar())>='0'&&c<='9');
	return s;
}
int upmin(int &a,int b)
{
	if(b<a)
	{
		a=b;
		return 1;
	}
	return 0;
}
int upmax(int &a,int b)
{
	if(b>a)
	{
		a=b;
		return 1;
	}
	return 0;
}
int f[3010][3010][2];
const int p=1000000007;
void add(int &a,int b)
{
	a=(a+b)%p;
}
int main()
{
	int n,m;
	scanf("%d%d",&n,&m);
	int i,j,k;
	f[0][0][1]=1;
	for(i=1;i<=n;i++)	
		f[0][i][0]=1;
	for(i=0;i<m;i++)
		for(j=0;j<=n;j++)
			for(k=0;k<=1;k++)
				if(f[i][j][k])
				{
					if(j)
					{
						add(f[i+1][j][k|(j==1)],f[i][j][k]);
						add(f[i+1][j-1][k|(j==1)],f[i][j][k]);
					}
					if(n-j)
					{
						add(f[i+1][j][k],f[i][j][k]);
						add(f[i+1][j+1][k],f[i][j][k]);
					}
				}
	int ans=0;
	for(i=0;i<=n;i++)
		add(ans,f[m][i][1]);
	printf("%d\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void open(const char*)’:
./Main.cpp:24:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  freopen(str,"r",stdin);
                        ^
./Main.cpp:26:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
  freopen(str,"w",stdout);
                         ^
./Main.cpp: In function ‘int main()’:
./Main.cpp:67:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^

Judge Result