import java.util.*;

public class Sorter {
    /** Sorts a list of ints in place.
     * (e.g., the input list should be sorted when this method returns)
     */
    public static void sortIntList(List<Integer> list) {
        for (int i = 0; i < list.size(); i++) {
            int minIdx = i;
            for (int j = i; j < list.size(); j++) {
                // We COULD do this with list.get(j) < list.get(minIdx), but
                // we use compareTo to demonstrate that it still works.
                if (((Integer)list.get(j)).compareTo(list.get(minIdx)) < 0) {
                    minIdx = j;
                }
            }
            int temp = list.get(i);
            list.set(i, list.get(minIdx));
            list.set(minIdx, temp);
        }
    }

    /** Sorts a list of Strings in place.
     * (e.g., the input list should be sorted when this method returns)
     */
    public static void sortStringList(List<String> list) {
        for (int i = 0; i < list.size(); i++) {
            int minIdx = i;
            for (int j = i; j < list.size(); j++) { 
                // Idea:
                     // We want:      list.get(j) >= list.get(minIdx)
                     // Subtract:     list.get(j) - list.get(minIdx) >= 0
                     // Replace:      list.get(j).compareTo(list.get(minIdx)) >= 0
                // Example:
                     //list.get(j) < list.get(minIdx)
                     //list.get(j) - list.get(minIdx) < 0
                     //list.get(j).compareTo(list.get(minIdx)) < 0
                if (list.get(j).compareTo(list.get(minIdx)) < 0) {
                    minIdx = j;
                }
            }
            String temp = list.get(i);
            list.set(i, list.get(minIdx));
            list.set(minIdx, temp);
        }
    }

    public static void main(String[] args) {
        List<Integer> intList = new ArrayList<Integer>();
        intList.add(1);
        intList.add(42);
        intList.add(100);
        intList.add(10);
        intList.add(3);
        System.out.println("Unsorted intList: " + intList);
        sortIntList(intList);
        System.out.println("Sorted intList:   " + intList);
        
        System.out.println();

        List<String> stringList = new ArrayList<String>();
        stringList.add("1");
        stringList.add("42");
        stringList.add("100");
        stringList.add("10");
        stringList.add("3");
        System.out.println("Unsorted stringList: " + stringList);
        sortStringList(stringList);
        System.out.println("Sorted stringList:   " + stringList);
    }
}