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Cod sursa(job #968152)
#include <cstdio>
#include <algorithm>
using namespace std;
int m, n, a[1025], b[1025], i, j, l[1025][1025], k, v[1024];
int main()
{
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(i=1;i<=n;i++)
scanf("%d", &b[i]);
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])
l[i][j]=l[i-1][j-1]+1;
else l[i][j]=max(l[i-1][j], l[i][j-1]);
printf("%d\n", l[m][n]);
i=m; j=n;
while(i>=1&&j>=1)
{
if(a[i]==b[j])
{
v[k++]=a[i];
i--; j--;
}
else if(l[i-1][j]>l[i][j-1])
i--;
else
j--;
}
for(i=k-1;i>=0;i--)
printf("%d ", v[i]);
return 0;
}