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我贴一下吧,求大牛们帮忙看看:

Posted by mostleg at 2005-07-30 12:16:27
In Reply To:是...可我为什么WA啊,我还重敲了一次 Posted by:mostleg at 2005-07-30 12:10:33
#include <cstdio>
#include <cstring>

long l[1001],r[1001];
long upl[1001][1001];
long upr[1001][1001];
long n;

long best[1001][1001];



int main()
{
	long i,j,a,b;

	while (scanf("%ld",&n)==1)
	{
		for (i=1;i<=n;i++)
		{
			scanf("%ld",&l[i]);
		}
		for (i=1;i<=n;i++)
		{
			scanf("%ld",&r[i]);
		}

		memset(upl,0,sizeof(upl));
		memset(upr,0,sizeof(upr));
		for (i=1;i<=n;i++)
		{
			for (j=1;j<=n;j++)
			{
				if (l[i]==r[j])
				{
					upl[i][j+1]=j;
					upr[j][i+1]=i;
				}
				else
				{
					upl[i][j+1]=upl[i][j];
					upr[j][i+1]=upr[j][i];
				}
			}
		}

		memset(best,0,sizeof(best));
		for (i=2;i<=n;i++)
		{
			for (j=2;j<=n;j++)
			{
				best[i][j]=best[i-1][j];
				if (best[i][j-1]>best[i][j])
					best[i][j]=best[i][j-1];
				if (l[i]!=r[j])
				{
					a=upl[i][j];
					b=upr[j][i];
					if ((a) && (b))
					{
						if (best[i][j]<best[a-1][b-1]+2)
							best[i][j]=best[a-1][b-1]+2;
					}
				}
			}
		}
		printf("%ld\n",best[n][n]);
	}

	return 0;
}

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