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帮忙看看!为什么我的递归lcs会超时??!!连例子都要等很久!!谢了

Posted by 2828 at 2009-08-01 11:18:32 on Problem 2250
#include"stdio.h"
#include"string.h"
char s[105][35],p[105][35],output_lcs[105][35];
int c[105][105];
int lcs(int i,int j)
{
	if(!i||!j)return c[i][j]=0;
	else if(strcmp(s[i-1],p[j-1])==0)
		c[i][j]=lcs(i-1,j-1)+1;
	else 
	{
		int t1=lcs(i,j-1);
		int t2=lcs(i-1,j);
		c[i][j]=t1>t2?t1:t2;
	}
	return c[i][j];
}
void output(int i,int j,int k)
{
		if(!i||!j)return;
		else if(c[i][j]==c[i-1][j])
			output(i-1,j,k);
			//i--;
		else if(c[i][j]==c[i][j-1])
			output(i,j-1,k);
			//j--;
		else
		{
			strcpy(output_lcs[k],s[i-1]);
			output(i-1,j-1,k-1);
			//i--;
			//j--;
			//k--;
		}
}

int main()
{
	int i=0,j=0,b;
	while(scanf("%s",s[i++])!=EOF)
	{
		while(scanf("%s",s[i])&&strcmp(s[i],"#")!=0)
			i++;
		while(scanf("%s",p[j])&&strcmp(p[j],"#")!=0)
			j++;
		lcs(i,j);//调用lcs
		output(i,j,c[i][j]);//输出函数
		for(b=1;b<=c[i][j];b++)
		{
			printf("%s",output_lcs[b]);
			if(b!=c[i][j])printf(" ");
		}
		printf("\n");
		i=j=0;
	}return 0;		
}





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