主要代码：
void LCSLength (char *x ,char *y, int m, int n, int **c, int **b)
{
int i ,j;
for (i = 1; i <= m; i++) c[i][0] = 0;
for (i = 1; i <= n; i++) c[0][i] = 0;
for (i = 1; i <= m; i++)
for (j = 1; j <= n; j++)
{
if (x[i]==y[j])
{
c[i][j]=c[i-1][j-1]+1;
b[i][j]=1;
}
else if (c[i-1][j]>=c[i][j-1])
{
c[i][j]=c[i-1][j];
b[i][j]=2;
}
else
{ c[i][j]=c[i][j-1];
b[i][j]=3;
}
}
}
void LCS(int i ,int j, char *x ,int **b)
{
if (i ==0 || j==0) return;
if (b[i][j]== 1)
{
LCS(i-1,j-1,x,b);
printf("%c",x[i]);
}
else if (b[i][j]== 2)
LCS(i-1,j,x,b);
else LCS(i,j-1,x,b);
}
