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Cod sursa(job #723075)
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,a[1024],l,c;
int main()
{
f>>n>>m;
for(int i = 0; i < n ; ++i)
{
f>>c;
if(a[c] > 0)
l++;
a[c]++;
}
for(int i = 0; i < m; ++i)
{
f>>c;
if(a[c] > 0)
l++;
a[c]++;
}
g<<l<<'\n';
for(int i = 0 ; i < 1024; ++i)
if(a[i] > 1)
g<<i<<' ';
return 0;
}