求两字符串的最长公共子序列。。= =,hentai啊真hentai

原先写的代码有些问题,这下修改了一次,,但是不是很完美,除了有字符串长度限制以外,有一些情况下的字符串会输出为一样的,主要因为回溯时虽然走了不同的路径,但是由于字符串中有重复的字符出现,导致显示出来的字符串还是一样的,解决办法就是将已经输出的最长公共子序列存起来,之后输出的从这里面进行筛选,没有的话再输出,并且将自己添加进去。。。。= =,,果然蛋疼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
class Program
{
constlong t =1000; //t为运算时用的数组的大小,应该不小于两字符串的最大长度,此处定义为1000
staticint[,] c =newint[t +1, t +1];
staticint[,] b =newint[t +1, t +1];
staticstring s ="";

staticvoid Main(string[] args)
{
string X ="";
string Y ="";
Console.Write(
"X: ");
X
+= Console.ReadLine(); //此处定义X字符串
Console.Write("Y: ");
Y
+= Console.ReadLine(); //此处定义Y字符串
Fuck(X, Y);
Console.WriteLine(
"The max length is "+ c[X.Length -1, Y.Length -1] +".\r\n");
Print(X, Y, X.Length
-1, Y.Length -1);

Console.ReadKey();
}

//运算的函数
staticvoid Fuck(string X, string Y)
{
int m = X.Length -1;
int n = Y.Length -1;

for (int i =1; i <= t; i++)
{
c[i,
0] =0;
}
for (int j =0; j <= t; j++)
{
c[
0, j] =0;
}
for (int i =1; i <= m; i++)
{
for (int j =1; j <= n; j++)
{
if (X[i] == Y[j])
{
c[i, j]
= c[i -1, j -1] +1;
b[i, j]
=2;
}
else
{
if (c[i -1, j] >= c[i, j -1])
{
c[i, j]
= c[i -1, j];
b[i, j]
=3;
}
else
{
c[i, j]
= c[i, j -1];
b[i, j]
=1;
}
}
}
}
}

//显示输出的函数
staticvoid Print(string X, string Y, int i, int j)
{
string r = s;
if (i ==0|| j ==0)
{
char[] arr = s.ToCharArray();
Array.Reverse(arr);
if (s.Length == c[X.Length -1, Y.Length -1])
Console.WriteLine(arr);
s
= r;
return;
}
if (b[i, j] ==2)
{
s
+= X[i];
Print(X, Y, i
-1, j -1);
}
else
{
if (b[i, j] ==3)
{
Print(X, Y, i
-1, j);
if (b[i, j -1] ==2)
{
s
= r;
Print(X, Y, i, j
-1);
}
}
else
{
Print(X, Y, i, j
-1);
}
}
}
}
}
原文地址:https://www.cnblogs.com/kanone/p/2015109.html