Järjestys

input/jarjestys2.java:46: error: cannot find symbol
        TreeMap tm = new TreeMap(Collections.reverseOrder());
                                 ^
  symbol:   variable Collections
  location: class jarjestys2
input/jarjestys2.java:61: error: bad operand types for binary operator '-'
            io.print(temp + " " + a-- + " " + a + temp - 1 + " ");
                                                       ^
  first type:  String
  second type: int
Note: input/jarjestys2.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors

//import java.util.Scanner;
//import java.util.TreeMap;
//import java.util.Set;
//import java.util.*;
import java.util.TreeMap;
import java.util.Iterator;
import java.util.Set;
import java.util.Map;
//import java.util.Arrays;
//import java.util.ArrayList;
public class jarjestys2 {

    public static void main (String[] args) {
        //Jarjestys();
        
        IO io = new IO();
//        Scanner scanner = new Scanner(System.in);
 //       int a = scanner.nextInt();
        int a = io.nextInt();//scanner.nextInt();
        //int y;
        int[] nums = new int[a];
        int[] turns = new int[a];
        for (int j = 0; j < a; j++) {
            nums[j] = io.nextInt();//scanner.nextInt();
            turns[j] = j+1;
        }
        //System.out.println(a*4);
        io.println(a*4);
        for (int i = 0; i < a; i++) {
            for (int j = i; j < a; j++) {//optim
                if (nums[i] > nums[j]) {
                    turns[j]--;
                    //System.out.println("J: " + j);
                    //System.out.println(turns[j]);
                }
            }
        }
        //create map from nums -> turns
        //sort based on nums
        //print largest num 1.
        //print turns[indexof(largestnum)]
        //print curr arr length
        //curr arr length--
        //print arr length
        //print posoflargestnum (index)
        TreeMap tm = new TreeMap(Collections.reverseOrder());
        for (int i = 0; i < nums.length; i++) {
            tm.put(nums[i], turns[i]);
        }
        Set set = tm.entrySet();
        Iterator i = set.iterator();
        // Display elements
        while(i.hasNext()) {
            Map.Entry me = (Map.Entry)i.next();
            int temp = (int) me.getValue();
            //System.out.println("Keyvalue: " + me.getKey());
            //System.out.print(temp + " ");
            //System.out.print(a-- + " ");
            //System.out.print(a + " ");
            //System.out.print(temp - 1 + " ");
            io.print(temp + " " + a-- + " " + a + temp - 1 + " ");
            /*
            io.print(a-- + " ");
            io.print(a + " ");
            io.print(temp - 1 + " ");
            */
        }
    }

}