/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
HashMap
<Integer, Integer
> m
= new HashMap
<>(); m.put(1, 2);
m.forEach((k, v) -> {
m.put(-k, -v);
});
}
}
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