/* 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
{
public int[] removedups (int[] arr) {
int i = 0;
for (int j=1; j<arr.length; j++) {
if (arr[j] != arr[i]) {
i = i+1;
arr[i] = arr[j];
}
}
return arr;
}
{
int[] arr = { 3,4,8,8,9,12,12,12,12,15,15,18,20 };
int[] res = removedups(arr);
for (int i = 0; i < res.length; i++) {
StdOut.print(res[i]);
}
}
}
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