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Cod sursa(job #759100)
#include <cstdio>
#include <algorithm>
using namespace std;
#define MAX 1025
int n,m,a[MAX],b[MAX],c[MAX][MAX];
void cmlsc(){
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])c[i][j]=1+c[i-1][j-1]; else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
void afis(int n,int m){
if(c[n][m]==0)return;
if(a[n]==b[m])
{
afis(n-1,m-1);
printf("%d ",a[n]);
return;
} else
if(c[n-1][m]>c[n][m-1])afis(n-1,m); else afis(n,m-1);
}
int main(){
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d %d",&n,&m);
for(int i=1;i<=n;i++)scanf("%d",&a[i]);
for(int i=1;i<=m;i++)scanf("%d",&b[i]);
cmlsc();
printf("%d\n",c[n][m]);
afis(n,m);
return 0;
}