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#include <stdio.h>
#include <stdlib.h>
int a[1024], b[1024];
int dp[1024][1024];
int max(int a, int b)
{
if(a>b)
{
return a;
}
return b;
}
int constructie(int m, int n)
{
int i, j;
for(i=1; i<=m; i++)
{
for(j=1; j<=n; j++)
{
if(a[i]==b[j])
{
dp[i][j]=1+dp[i-1][j-1];
}
else
{
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
}
}
return dp[m][n];
}
void subsir(int l, int c)
{
if(l==0 || c==0)
{
return;
}
if(a[l]==b[c])
{
subsir(l-1, c-1);
printf("%d ", a[l]);
}
else
{
if(dp[l-1][c]>dp[l][c-1])
{
subsir(l-1, c);
}
else
{
subsir(l, c-1);
}
}
}
int main()
{
int M, N, i, j;
freopen ("cmlsc.in","r",stdin);
freopen ("cmlsc.out","w",stdout);
scanf("%d%d",&M,&N);
for(i=1; i<=M; i++)
{
scanf("%d",&a[i]);
}
for(j=1; j<=N; j++)
{
scanf("%d",&b[j]);
}
printf("%d\n",constructie(M, N));
subsir(M, N);
return 0;
}