学步园

题意：求两个字符串的最长公共子序列的长度。

题目链接：http://poj.org/problem?id=1458

——>>LCS模板题。。

#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>

using std::string;
using std::cin;
using std::cout;
using std::endl;
using std::max;

const int MAXN = 1000 + 10;

int dp[MAXN][MAXN];

int Lcs(string strA, string strB)
{
    int nLenA = strA.length();
    int nLenB = strB.length();

    memset(dp, 0, sizeof(dp));
    for (int i = 1; i <= nLenA; ++i)
    {
        for (int j = 1; j <= nLenB; ++j)
        {

            if (strA[i - 1] == strB[j - 1])
            {
                dp[i][j] = dp[i - 1][j - 1] + 1;
            }
            else
            {
                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
            }
        }
    }

    return dp[nLenA][nLenB];
}

int main()
{
    string strA;
    string strB;

    while (cin >> strA >> strB)
    {
        cout << Lcs(strA, strB) << endl;
    }

    return 0;
}