HDU 1159 Common Subsequence 【最长公共子序列】模板题

题目链接：https://vjudge.net/contest/124428#problem/A

题目大意：
给出两个字符串，求其最长公共子序列的长度。

最长公共子序列算法详解：https://blog.csdn.net/hrn1216/article/details/51534607     （其中的图解很详细）   根据图解理解下面代码

#include<cstdio> 
#include <string>
#include<cstring>  
#include<iostream>  
#include<algorithm>  
using namespace std;
int map[1005][1005];
string str1, str2;
int len1, len2;

int main()
{
    while (cin >> str1 >> str2)
    {
        len1 = str1.length();
        len2 = str2.length();
        for (int i = 0; i <= len1; i++)
        {
            for (int j = 0; j <= len2; j++)
            {
                if (i == 0 || j == 0) { map[i][j] = 0; continue; }              //初始化，将第一行和第一列全部初始化为0
                if (str1[i - 1] == str2[j - 1])
                    map[i][j] = map[i - 1][j - 1] + 1;
                else
                    map[i][j] = max(map[i - 1][j], map[i][j - 1]);
            }
        }
        printf("%d\n", map[len1][len2]);
    }
    return 0;
}

2018-04-29