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Cod sursa(job #879040)
#include<stdio.h>
#include<algorithm>
using namespace std;
int a[1050],b[1050],dp[1050][1050],sol[1050];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int i,j,n,m,mx;
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
for(i=1;i<=m;i++)
scanf("%d",&b[i]);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
i=n; j=m;
while(i>0 && j>0)
{
if(a[i]==b[j])
{
sol[++sol[0]]=a[i];
i--;
j--;
}
else
{
mx=max(dp[i-1][j],dp[i][j-1]);
if(mx==dp[i-1][j]) i--;
else j--;
}
}
printf("%d\n",sol[0]);
for(i=sol[0];i>=1;i--)
printf("%d ",sol[i]);
return 0;
}