#include<iostream>
#include<iomanip>
using namespace std;
//tag标志，0为左斜上，1取左，2取上;count为最长公共子序列计数
//计算最长公共子序列长度
void LCS_Length(char *X, char *Y, int *count[],int *tag[],int length_X, int length_Y)
{//第一排第一列全部是0for (int i = 0; i < length_X+1; i++){count[i][0] = 0;}for (int i = 0; i < length_Y+1; i++){count[0][i] = 0;}for (int i = 1; i <= length_X; i++){for (int j = 1; j <= length_Y; j++){if (X[i-1] == Y[j - 1]){count[i][j] = count[i-1][j-1]+1;tag[i][j] = 0;}//否则取较大的值else if(count[i-1][j] > count[i][j-1]){count[i][j] = count[i-1][j];tag[i][j] = 1;}else{count[i][j] = count[i][j-1];tag[i][j] = 2;}}}
}
//打印最长公共子序列元素
void Print_LCS(int *tag[],char *X,int Length_X, int Length_Y)
{if (Length_X == 0 || Length_Y == 0){return ;} int i = Length_X, j = Length_Y;if (tag[i][j] == 0){cout<<X[i-1]<<setw(4);Print_LCS(tag,X,i-1,j-1);}else if(tag[i][j] == 1){Print_LCS(tag,X,i-1,j);}else{Print_LCS(tag,X,i,j-1);}
}int main()
{//先人为设置两个序列char *X = "BDCABA";char *Y = "ABCBDA";int *count[7];for (int i = 0; i < 7; i++){count[i] = new int[7];       //因为第一行第一列全为0，所以总共七行七列
    }int *tag[7];for (int i = 0; i < 7; i++){tag[i] = new int[7];}LCS_Length(X,Y,count,tag,strlen(X),strlen(Y));cout<<"最大子序列数为"<<count[6][6]<<endl;/****************************************for(int i= 0; i <7; i++){for (int j = 0; j < 7; j++){cout<<count[i][j]<<setw(3);}cout<<endl;}*****************************************/Print_LCS(tag,X,strlen(X),strlen(Y));cout<<endl;return 0;
}

        /***********************************************//华丽丽的分割线--------------------------------二维指针到底怎么用int *(*ptr) = new int*[strlen(X)];for (int i = 0; i < strlen(X); i++){ptr[i] = new int[strlen(X)];}ptr[2][3] = 0;cout<<ptr[2][3]<<endl;**********************************************/