Submission #1695427

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Source Code Expand

#include<bits/stdc++.h>
const int N = 3e3 + 10;
using namespace std;

int f[N][N][2];
int n, m;
const int mod = 1e9 + 7;
inline void add(int &x,int y)
{  
   x += y; 
   if(x >= mod) x %= mod;
}

namespace solver
{
  void solve()
  {
    scanf("%d%d",&n,&m);
    for(int i=0; i<=m; ++i) f[0][i][!i]=1;
    for(int i=0; i<m; ++i)
	  for(int j=0; j<=n; ++j)
	    for(int v=0; v<2; ++v)
		{
		  int val=f[i][j][v];
		  if(j)
		  {
		    add(f[i+1][j-1][v|(j==1)], val);
			add(f[i+1][j][v|(j==1)], val);
		  }
		  if(n-j)
		  {
		    add(f[i+1][j][v], val);
			add(f[i+1][j+1][v], val);
		  }
		}
    int ans=0;
    for(int i=0; i<=n; ++i) add(ans,f[m][i][1]);
    printf("%d\n",ans);
  }
}

int main() { solver :: solve();}

Submission Info

Compile Error

./Main.cpp: In function ‘void solver::solve()’:
./Main.cpp:18:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^

Judge Result