#include <iostream>
using namespace std;
int main() {
short int mas[];
for(short int i=0; i<20; i++)
{
static short int j=0;
if(i%2)
{
mas[i]=i;
}
else
{
j+=1;
mas[i]=j;
}
}
for(short int i=0; i<20; i++)
{
cout<<" "<<mas[i];
}
cout<<"\n";
return 0;
}
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