poj 1458 Common Subsequence_最长公共子串

题意：略

求最长公共子串

#include<iostream>
#include<cstdio>
#include<string>
using namespace std;
int dp[500][500];
int max(int a,int b)
{ 
return a>b?a:b;
}
int main()
{
	int i,j,a,b;
	char s1[400],s2[400];
	while(scanf("%s%s",s1,s2)!=EOF)
	{
		memset(dp,0,sizeof(dp));
		a=strlen(s1);
		b=strlen(s2);
		for(i=1;i<=a;i++)
		{
			for(j=1;j<=b;j++)
			{
				if(s1[i-1]==s2[j-1])
				{
					dp[i][j]=dp[i-1][j-1]+1;
				}
				else
				{
					dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
				}
			}
		}
		printf("%d\n",dp[a][b]);
	}
	return 0;
}