POJ 1458 Common Subsequence

求最长公共子序列，题目居然没有给出字符串最大长度。

 

/*Accepted 428K 0MS C++ 570B 2012-04-11 10:26:03 */

#include<cstdlib>
#include<cstring>
#include<cstdio>
#define MAXN 1 << 8
#define max(a, b) ( a > b ? a : b)
char X[MAXN], Y[MAXN];
int f[MAXN][MAXN];
int x, y;

void dp()
{
    memset( f, 0, sizeof f);
    x = strlen(X + 1), y = strlen( Y + 1);
    for( int i = 1; i <= x; i ++)
        for( int j = 1; j <= y; j ++)
        {
            if( X[i] == Y[j])
                f[i][j] = f[i - 1][j - 1] + 1;
            else
                f[i][j] = max( f[i - 1][j], f[i][j - 1]);
        }
}

int main()
{
    while( scanf( "%s%s", X + 1, Y + 1) == 2)
    {
        dp();
        printf( "%d\n", f[x][y]);
    }
    return 0;
}