plan 1
#include <cstdio>
int main()
{
printf("Hello world!");
}
plan 2
#include <iostream>
using namespace std;
int main()
{
cout<<"Hello world!";
}
plan 1
#include <cstdio>
int main()
{
printf("Hello world!");
}
plan 2
#include <iostream>
using namespace std;
int main()
{
cout<<"Hello world!";
}
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