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Cod sursa(job #876147)
#include<stdio.h>
#include <vector>
using namespace std;
#define max(a,b) ((a>b) ? a : b)
vector<int>a,b;
int sol[1024];
int mat[1025][1025];
int main()
{int m,n,i,j,nr,ct=0;
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d%d",&m,&n);
for(i=1;i<=m;i++){
scanf("%d",&nr);
a.push_back(nr);
}
for(i=1;i<=n;i++){
scanf("%d",&nr);
b.push_back(nr);
}
for(i=0;i<=m;i++)
for(j=0;j<n;j++)
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1] +1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]) ;
for(i=m,j=n;i;)
{
if(a[i]==b[j])
{sol[++ct]=a[i];
i--;
j--;
}
else
if(mat[i-1][j]<mat[i][j-1])
j--;
else
i--;
}
printf("%d\n",ct);
for(i=ct;i>0;--i)
printf("%d ",sol[i]);
return 0;
}