Common Subsequence

http://acm.hdu.edu.cn/showproblem.php?pid=1159

#include<iostream>
#include<cstring>
using namespace std ;
char str1[10000] ;
char str2[10000] ;
int c[10000][10000] ;
int main()
{
    int len1, len2, i, j ;
    while(cin>>str1>>str2)
    {
        len1 = strlen(str1) ;
        len2 = strlen(str2) ;
        for(i=0; i<len1; i++)
        c[i][0] = 0 ;
        for(j=0; j<len2; j++)
        c[0][j] = 0 ;
        for(i=1; i<len1+1; i++)
        for(j=1; j<len2+1; j++)
        {
            if(str1[i-1]==str2[j-1])
            c[i][j] = c[i-1][j-1] + 1 ;
            else c[i][j] = c[i][j-1]>c[i-1][j]?c[i][j-1]:c[i-1][j] ;
        }
        cout<<c[len1][len2]<<endl ;
    }
    return 0 ;
}