Envío 4642

Código

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int N = Integer.parseInt(br.readLine());
        String[] numsS = br.readLine().split(" ");
        int[] nums = new int[N];
        for (int i = 0; i < N; i++) {
            nums[i] = Integer.parseInt(numsS[i]);
        }
        mergeSort(nums);
        String array = "";
        for (int i = 0; i < N; i++) {
            array += " " + nums[i];
        }
        bw.write(array.trim() + "\n");
        bw.close();
        br.close();
    }

    public static void mergeSort(int[] array) {
        mergeSort(array, 0, array.length - 1);
    }

    public static void mergeSort(int[] array, int startIndex, int endIndex) {
        if (startIndex < endIndex) {
            int middleIndex = (startIndex + endIndex) / 2;
            if (startIndex < middleIndex) {
                mergeSort(array, startIndex, middleIndex);
            }
            if (middleIndex + 1 < endIndex) {
                mergeSort(array, middleIndex + 1, endIndex);
            }
            mergeSorted(array, startIndex, middleIndex, endIndex);
        }
    }

    public static void mergeSorted(int[] array, int startIndex1, int endIndex1, int endIndex2) {
        int[] tempArray = array.clone();
        int startIndex2 = endIndex1 + 1;
        int iterator1 = startIndex1;
        int iterator2 = startIndex2;
        for (int i = startIndex1; i <= endIndex2; i++) {
            int item = Integer.MAX_VALUE;
            if (iterator1 <= endIndex1) { // no ha llegado al final de la primera mitad
                item = tempArray[iterator1];
            }
            if (iterator2 <= endIndex2 && tempArray[iterator2] < item) { // no ha llegado al final de la primera mitad y
                                                                         // hay
                // un item menor ahi
                item = tempArray[iterator2];
                iterator2++;
            } else {
                iterator1++;
            }
            array[i] = item;
        }
    }
}