1 #include<stdio.h>
2 #include<string.h>
3
4 const int max=120;//字符串大小
5 char x[max],y[max];
6 int b[max][max];
7 int c[max][max];
8 int m,n;
9
10 void printstring(int i,int j)//打印最长字串
11 {
12 if(i==0||j==0) return;
13 if(b[i][j]==1)
14 {
15 printstring(i-1,j-1);
16 printf("%c ",x[i-1]);
17 }
18 else if(b[i][j]==2)
19 printstring(i-1,j);
20 else
21 printstring(i,j-1);
22 }
23
24 void maxstring()//动态规划求最长字串长度
25 {
26 int i,j;
27 memset(c,0,sizeof(c));
28 for(i=1;i<=m;i++)
29 for(j=1;j<=n;j++)
30 if(x[i-1]==y[j-1])
31 {
32 c[i][j]=c[i-1][j-1]+1;
33 b[i][j]=1;
34 }
35 else if(c[i-1][j]>c[i][j-1])
36 {
37 c[i][j]=c[i-1][j];
38 b[i][j]=2;
39 }
40 else
41 {
42 c[i][j]=c[i][j-1];
43 b[i][j]=3;
44 }
45 printf("%d\n",c[m][n]);
46 }
47
48
49 int main()
50 {
51 while(scanf("%s%s",x,y))
52 {
53 m=strlen(x);
54 n=strlen(y);
55 maxstring();
56 printstring(m,n);
57 printf("\n\n");
58 }
59 return 0;
60 }
