#include <iostream.h>
#include <memory.h>
int max(int a,int b,int c,int d)
{
	
	int y,z=0;
	if (a>b)
		y=a;
	else
		y=b;
	if (c>d)
		z=c;
	else
		z=d;
	if (y>z)
	{
	
	
	return y;
	}

	else

	{
		return z;
	}
}
char matrix[20][20];
int hang,lie=0;
int compare(int a,int b,int letter[26])
{
	letter[int (matrix[a][b])-65]=1;
	
	

	int test[4];
	memset (test,0,sizeof (test));
	if ((a-1==-1)||(letter[int(matrix[a-1][b])-65]==1))
	{
		test[0]=0;
	}
	else
	{
		test[0]=1+compare(a-1,b,letter);
	}
	if ((a+1==hang)||(letter[int (matrix[a+1][b])-65]==1))
	{
		test[1]=0;
	}
	else
	{
		test[1]=1+compare(a+1,b,letter);
	}
	if ((b-1==-1)||(letter[int (matrix[a][b-1])-65]==1))
	{
		test[2]=0;
	}
	else
	{
		test[2]=1+compare(a,b-1,letter);
	}
	if ((b+1==lie)||(letter[int (matrix[a][b+1])-65]==1))
	{
		test[3]==0;
	}
	else
	{
		test[3]=1+compare(a,b+1,letter);
	}
	
	
	return max(test[1],test[0],test[2],test[3]);
}

		
		


int main()
{
	

	int a,b=0;
	cin>>hang>>lie;
	for (a=0;a<hang;a++)
		for (b=0;b<lie;b++)
			cin>>matrix[a][b];
		int letter[26];
		memset (letter,0,sizeof (letter));

	
		int u=0;
		u=compare(0,0,letter);
	

		cout<<u+1<<endl;
		
}

• Re:为什么会有错? (83) orange82334 2007-02-25 19:30:50