/* 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
{
{
v.add(2);
v.add(0);
v.add(4);
v.add(3);
v.add(1);
for (int i = 0; i<=3; i++){
for (int j = 0; j<=3-i; j++){
if(v.get(j)>v.get(j+1)){
system.out.println(i+"_"+j);
}
}
}
}
}
}
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