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Cod sursa(job #744632)
#include <cstdio>
#include <algorithm>
using namespace std;
int n,m,A[1025],B[1025],C[1025][1025];
int cmlsc(){
for(int i=0;i<n;i++)
for(int j=0;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 tipar(int i,int j){
if(C[i][j]>0){
if(A[i]==B[j])tipar(i-1,j-1); else
if(C[i-1][j]>C[i][j-1])tipar(i-1,j);else tipar(i,j-1);
if(A[i]==B[j])printf("%d ",A[i]);
}
}
int main(){
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d %d",&n,&m);
for(int i=0;i<n;i++)scanf("%d",&A[i]);
for(int i=0;i<m;i++)scanf("%d",&B[i]);
cmlsc();
printf("%d\n",C[n-1][m-1]);
tipar(n-1,m-1);
}